SE-330-20-11_技术文档

Tel: (800) 832-3873

Email: relays@littelfuse.com

www.littelfuse.com/SE-330

SE-330 MANUAL

NEUTRAL-GROUNDING-RESISTOR MONITOR

REVISION 11-A-063018

Document Number: PM-1200-EN

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

7 ORDERING INFORMATION.................................................. 34

8 WARRANTY .......................................................................... 35

TABLE OF CONTENTS

1 GENERAL............................................................................1

1.1 Modern Resistance-Grounded Systems.....................1

1.2 SE-330 NGR Monitoring.............................................1

1.3 NGR Short Detection..................................................2

9 TEST PROCEDURES............................................................ 35

9.1 Resistor-Fault Tests...................................................... 35

9.1.1 Calibration and Open Test......................................... 35

9.1.2 Voltage Test............................................................... 35

9.2 Sensing-Resistor Test................................................... 35

9.3 Analog-Output Test ...................................................... 36

9.4 Ground-Fault Performance Test.................................... 36

2 OPERATION........................................................................2

2.1 Settings......................................................................2

2.1.1 GF Trip Time ............................................................2

2.1.2 GF Trip Level............................................................2

2.1.3 V_NTrip Level............................................................2

2.1.4 Pulse-Period Adjustment ........................................3

2.1.5 Conﬁguration Settings............................................4

2.1.5.1 Relay K1 Function (S1).........................................4

2.1.5.2 Trip-Relay Mode and

APPENDIX A SE-330 REVISION HISTORY.......................... 37

LIST OF FIGURES

Trip-Memory Mode (S2)...................................................4

2.1.5.3 Ground-Fault-Trip Latch (S3)................................4

2.1.5.4 Resistor-Fault-Trip Latch (S4)...............................4

2.1.5.5 Sensing-Resistor Selection (S5) ..........................4

2.1.5.6 Frequency (S6) .....................................................4

2.1.5.7 Upgrade Mode (S8) .............................................4

2.1.6 Resistor-Fault Trip Time ..........................................4

2.1.7 Resistor-Fault Trip Level ........................................4

2.1.8 Geo-Magnetic Filter................................................4

2.2 Calibration .................................................................5

2.3 Pulsing Operation ......................................................5

2.4 Trip Indication and Reset...........................................5

2.5 Remote Operation......................................................5

2.6 Relay K1 LED..............................................................6

2.7 Unit Healthy Output...................................................6

2.8 Diagnostic LED...........................................................6

2.9 Enhanced Health Status ............................................6

2.10 Analog Output..........................................................6

1

2

3

4

5

6

7

8

9

Conﬁguration switches......................................................... 4

Analog-output connections.................................................. 6

SE-330 connection diagram ................................................. 7

SE-330 outline and panel-mounting details......................... 8

SE-330 outline and surface-mounting details...................... 9

SE-IP65CVR-G weatherproof cover outline........................ 10

SE-IP65CVR-G weatherproof cover installation................. 11

ER-600VC sensing resistor................................................. 12

SE-MRE-600 moisture-resistant enclosure outline ........... 13

10 ER-600VC installed in SE-MRE-600 ................................... 14

11 ER-5KV sensing resistor..................................................... 15

12 ER-5WP sensing resistor.................................................... 16

13 ER-15KV sensing resistor................................................... 17

14 ER-25KV sensing resistor................................................... 18

15 ER-35KV sensing resistor................................................... 19

16 ELCT5-88 and ELCT30-88 ground-fault current sensors .... 21

17 ELCT5-31 and ELCT30-31 ground-fault current sensors .... 22

18 RK-332 remote indication and reset .................................. 23

19 PGA-0520 analog percent current meter ........................... 23

20 Simpliﬁed isolated-ground connection .............................. 24

21 Simpliﬁed pulsing connection............................................ 24

22 Ground-fault test circuits ................................................... 36

3 INSTALLATION ..................................................................6

3.1 SE-330........................................................................6

3.2 Sensing Resistor......................................................12

3.3 Ground-Fault CT.......................................................20

3.4 Isolated Ground Connection ....................................24

3.5 Pulsing Connection ..................................................24

LIST OF TABLES

4 DATA INTERFACES..........................................................25

4.1 SD Card....................................................................25

4.1.1 Datalogging ..........................................................25

4.1.2 Firmware Upgrade ................................................25

4.2 USB Interface...........................................................25

4.3 Network Communications .......................................26

1

2

3

Typical tripping system values............................................. 3

Ground-fault trip levels for selected CTs ............................. 3

Ground-fault-test record..................................................... 36

DISCLAIMER

5 TROUBLESHOOTING.......................................................27

Speciﬁcations are subject to change without notice. Littelfuse,

Inc. is not liable for contingent or consequential damages or for

expenses sustained as result of incorrect application, incorrect

adjustment, or malfunction.

6 TECHNICAL SPECIFICATIONS .......................................29

6.1 SE-330......................................................................29

6.2 Sensing Resistors ....................................................31

6.3 Current Sensors .......................................................32

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

•

A transformer can provide the inductance necessary to cause

ferroresonance if the NGR opens.

1. GENERAL

1.1 Modern Resistance-Grounded Systems

Following these guidelines will reduce the ﬂash hazard, reduce

point-of-fault damage, achieve reliable ground-fault protection, and

ensure a stable system not subject to ferroresonance.

A high-resistance-grounded system uses a neutral-grounding

resistor (NGR) with a low let-through current to limit the ground-

fault current. This is an improvement from low-resistance and

solidly grounded systems, which do not use NGRs and therefore

have a ground-fault ﬂash hazard that can cause substantial point-

of-fault damage. High-resistance grounding eliminates these

problems. Modern ground-fault protection reliably operates at low

current levels. Furthermore, the probability of an arc-ﬂash incident

is signiﬁcantly reduced in high-resistance-grounded systems.

1.2 SE-330 NGR Monitoring

The SE-330 is a microprocessor-based NGR monitor that detects

NGR failures and ground faults in resistance-grounded systems and

is compliant with the 2018 CE Code. The SE-330 measures NGR

resistance, NGR current, and transformer or generator neutral-to-

ground voltage. The components required to monitor an NGR are

an SE-330, a 20- or 100-kΩ ER-series sensing resistor, and a current

transformer (CT).

NGR selection depends on system charging current and whether

the system is an alarm-only or a tripping system. Alarm-only

systems are usually restricted to system voltages up to 5 kV with

NGR let-through currents of 5 A or less. Occasionally, alarm-only

systems up to 15 kV and 10 A are used, however, these systems

are not common because a ground fault on such a system tends

to escalate to a phase-to-phase fault before the ground fault can

be located and cleared. Consult Canadian Electrical (CE) Code rule

10-302, National Electric Code (NEC)* 250.36, and NEC 250.186 for

application details.

Power-circuit elements (other than neutral-connected NGRs)

that purposefully connect the power system to ground are often

not compatible with SE-330 NGR monitoring. These elements

include single-phase grounding transformers, grounded-wye-

primary potential transformers, and grounded-wye-primary power

transformers.

The SE-330 continuously measures NGR resistance in an

unfaulted system. It will trip on resistor fault if the NGR resistance

varies from its calibrated value. When a ground fault occurs, voltage

is present on the neutral. NGR current will ﬂow if the NGR is healthy.

The SE-330 will trip on ground fault if fault current exceeds the GF

TRIP LEVEL setting for an interval equal to the GF TRIP TIME setting.

However, if the NGR fails open during a ground fault, it is possible

for fault resistance to satisfy the NGR resistance measurement. To

detect this double-fault condition, the SE-330 measures neutral

voltage. If neutral voltage exceeds the V_NTRIP LEVEL setting and if

NGR current is less than 5% of the CT rating, the SE-330 will trip on

resistor fault. If the resistor-fault circuit is tripped and the neutral

voltage exceeds the V_NTRIP LEVEL setting for an interval greater

than the GF TRIP TIME setting, the ground-fault circuit will also trip.

System charging current is the capacitive current that ﬂows

to ground when a bolted ground fault occurs. This current can

be calculated or measured. For small systems, the magnitude of

charging current may be conservatively estimated as ½ A per 1,000

kVA in low-voltage systems and 1 A per 1,000 kVA in medium-

voltage systems.

In an alarm-only system or in a tripping system without selective

coordination, use an NGR with a let-through current larger than the

system charging current. Set the pick-up current of ground-fault

devices at or below 50% of the NGR let-through current.

In a tripping system with selective coordination, use ground-fault

devices that have a deﬁnite-time characteristic to achieve time

coordination. Use the same pick-up current for all ground-fault

devices, which must be a larger value than the charging current

of the largest feeder. Select an NGR with a let-through current

between ﬁve and 10 times the pick-up current of the ground-fault

devices.

Ground-fault current is sensed by a CT with a 1- or 5-A secondary,

or by a CT (ELCT5-x or ELCT30-x) with a 50-mA secondary. The trip

level of the ground-fault circuit is adjustable from 2 to 100% of the

CT rating. The trip time is adjustable from 0.1 to 10.0 seconds.

The SE-330 has four output relays. With ﬁrmware version 3.00 or

higher, relays K1, K2, and K3 can be assigned to one of the following

functions (using SE-MON330 version 4.0 or higher):

Do not use a grounding transformer with a low-voltage resistor:

•

The combined cost of a transformer and a low-voltage resistor

is more than the cost of a resistor that is rated for line-to-

neutral voltage.

•

Ground Fault (GF);

Resistor Fault (RF);

Enhanced Health Status (HEALTH);

GF + RF;

•

A transformer saturated by a ground fault through a rectiﬁer

can make ground-fault protection inoperative.

Transformer inrush current up to 12 times the rated current can

cause a voltage that is larger than expected.

GF + RF + HEALTH; or

DISABLED.

A parallel transformer winding makes it difﬁcult to monitor

NGR continuity.

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

In addition to the selected function, K1 is also assigned a trip or

pulsing function. When the pulsing function is selected, relay K1

is used to control a contactor to assist in locating faults. Relays

K1, K2, and K3 can be set to operate in the fail-safe or non-fail-

safe mode for undervoltage or shunt-trip applications. Relay K4 is a

solid-state relay that provides basic UNIT HEALTH indication.

is not detected. A trip will eventually occur when the time for fault

current above the trip level is greater than the time for fault current

below the trip level.

A non-accumulating mode can also be selected. In this mode, a

trip occurs if the fault current remains higher than the ground-fault

trip level for the duration of the ground-fault trip time.

Additional features include LED trip indication, trip memory,

front-panel and remote reset, 4-20-mA analog output, trip event

recorder, USB local communications, microSD* data logging, and

optional network communications.

2.1.2 GF Trip Level

The SE-330 uses a Discrete-Fourier Transform (DFT) algorithm to

measure the fundamental component of NGR current.

The SE-330 provides additional features over the SE-330 legacy

model (revision 04 or less):

Choose an NGR let-through current and a ground-fault trip

level using the guidelines in Section 1.1. Set the ground-fault

trip level between 2 and 100% of the CT-primary rating. When

the ground-fault trip level is set to MEM, the ground-fault setting

that is stored in non-volatile memory is used. This parameter

must be set using a PC running the SE-MON330 software and

connected to the USB interface. The setting range is 2 to 100%

of CT primary rating in 1% increments. The default value is 15%.

Inputs are provided for 5-, 1-, and 0.05-A secondary CTs. Typical

values for 5-, 15-, and 25-A tripping systems are shown in Table 1.

Ground-fault trip levels for the selected CTs are shown in Table 2.

For other systems, refer to the NGR Monitor Set-Point Assistant

at www.littelfuse.com/relayscontrols. The Set-Point Assistant is

included with the SE-MON330 software.

•

NGR short detection capability.

Conﬁgurable output relay function and operating mode (K1,

K2, and K3).

•

When the trip level is set to MEM, the ground-fault trip setting

is deﬁned by an internal non-volatile memory variable. The

range is 2 to 100% in 1% increments of the CT-primary rating.

•

The number of trip records has been increased to 100 and

includes date and time stamping.

A microSD card interface can be used for short-term data

logging and ﬁrmware updates. A microSD card is included.

See Section 4.1.

•

For ease of connection to new devices, the RS-232 interface

has been replaced by a Mini-B USB port.

2.1.3 V_NTrip Level

The SE-330 uses a DFT algorithm to measure the fundamental

component of neutral voltage (V_N).

Dual Ethernet ports are available with support for ﬁber-optic

and RJ45 interfaces.

The SE-330 will trip and indicate a resistor fault if neutral voltage

is greater than the V_NTRIP LEVEL setting for the duration of the

resistor-fault trip time, and ground-fault current is less than 5% of

the CT rating. If the resistor-fault circuit is tripped and the neutral

voltage exceeds the V_NTRIP LEVEL setting for an interval greater

than the GF TRIP TIME setting then the ground-fault circuit will

also trip.

An added IEC61850 protocol.

1.3 NGR Short Detection (ﬁrmware version 3.00 and higher)

The SE-330 can be conﬁgured to monitor and trip if the NGR

resistance decreases to a value less than 10 to 70% of the Nominal

NGR Resistance value. The Nominal NGR Resistance, NGR Short

Trip Level, and several other values can be conﬁgured using SE-

MON330 (version 4.0 or higher). Refer to the SE-MON330 manual

for further details.

The V_NTRIP LEVEL range is 20 to 2,000 V when switch S5 is in the

20-kΩ (Vx1) position, and the range is 100 to 10,000 V when switch

S5 is in the 100-kΩ (Vx5) position. Calculate the voltage across the

NGR when the NGR current is equal to the pick-up current of the

ground-fault circuit. Set the V_NTRIP LEVEL to the next largest value.

See Fig. 1 and Section 2.1.5.5.

2. OPERATION

2.1 Settings

2.1.1 GF Trip Time

Typical values for 5- 15-, and 25-A tripping systems are shown

in Table 1. For an NGR resistance greater than 2 kΩ, use a 100-kΩ

sensing resistor. For other systems, refer to the NGR Monitor Set-

Point Assistant at www.littelfuse.com/relayscontrols.

GF TRIP TIME (deﬁnite time) is adjustable from 0.1 to 10.0

seconds. Time-coordinated ground-fault protection requires this

setting to be longer than the trip times of downstream ground-fault

devices.

NOTE: A resistor-fault trip is inhibited if the ground-fault current is

above 5% of the CT rating.

A trip-time accumulator provides a ground-fault memory function

for detection of intermittent faults. The accumulated time increases

when a ground fault is detected and decreases when a ground fault

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

TABLE 1. Typical tripping system values

SYSTEM

VOLTAGE

NEUTRAL-GROUNDING

RESISTOR

GROUND-FAULT

SENSING RESISTOR

V_NTRIP LEVEL

(VOLTS)

TRIP LEVEL

(LINE-TO-LINE)

RESISTANCE

CURRENT

RESISTANCE

(OHMS)

(VOLTS)

MODEL

(SWITCH S5

SETTING)

(AMPERES)

480

600

5

55

69

ER-600VC

ER-5KV

20 kΩ

100 kΩ

20 kΩ

100 kΩ

1.0

3.0

5.0

60

100

5

2,400

4,160

480

5

277

480

18

340

5

ER-5KV

800

15

25

ER-600VC

ER-5KV

60

600

23

100

2,400

4,160

7,200

14,400

4,160

7,200

14,400

25,000

35,000

92

340

160

277

554

96

ER-5KV

800

ER-15KV

ER-5KV

170x5 = 850

340x5 = 1,700

800

166

332

577

808

ER-15KV

ER-25KV

ER-35KV

170x5 = 850

340x5 = 1,700

800x5 = 4,000

1,200x5 = 6,000

TABLE 2. Ground-fault trip levels for selected CTs

ELCT5-x

EFCT-x

ELCT30-x

50:1

50:5

(AMPERES)

100:1

100:5

(AMPERES)

200:1

200:5

(AMPERES)

400:1

400:5

(AMPERES)

GF TRIP

SE-CS30-x

30:0.05

LEVEL(%)⁽¹⁾

5:0.05

(AMPERES)

2

4

0.10

0.20

0.30

0.40

0.50

1.00

2.00

3.00

4.00

5.00

0.60

1.20

*

16

6

1.80

*

12

16

20

40

80

120

160

200

24

8

2.40

*

8

36

10

20

40

60

80

100

3.00

5

10

20

40

60

80

100

40

6.00

10

20

30

40

50

80

12.00

18.00

24.00

30.00

160

240

320

400

⁽¹⁾When set to MEM, range is 2 to 100% in 1% increments.

* Setting not recommended.

See Section 2.3 for detailed pulsing operation information.

2.1.4 Pulse-Period Adjustment

NOTE: For pulsing conﬁguration, set switch S1 to K1 = PULSING

and install an external pulse-enable switch.

Pulse period is the cycle time of relay K1 when the SE-330 is

conﬁgured for pulsing operation. Pulse period is adjustable from 1.0

to 3.0 seconds with a ﬁxed duty cycle of 50 percent. For example,

with the 1.0-s setting, relay K1 will be energized for 0.5 seconds

and de-energized for 0.5 seconds when pulsing is enabled.

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

2.1.5 Conﬁguration Settings

2.1.5.3 Ground-Fault-Trip Latch (S3)

Eight conﬁguration switches (S1 to S8) and a calibration button

are located behind the access cover on the front panel. See Fig. 1.

Set switch S3 to select latching or non-latching ground-fault-

circuit operation. Non-latching operation overrides ground-fault-trip

memory. See Sections 2.1.5.2 and 2.4.

CALIBRATION BUTTON

2.1.5.4 Resistor-Fault-Trip Latch (S4)

Set switch S4 to select latching or non-latching resistor-fault-

circuit operation. Non-latching operation overrides resistor-fault-

trip memory. See Sections 2.1.5.2 and 2.4.

K1 =TRIP

K1 = PULSING

S1

S2

S3

S4

S5

S6

S7

S8

K1 NON-FAIL-SAFE

NON-LATCHING GF TRIP

K1 FAIL-SAFE

LATCHING GF TRIP

LATCHING RF TRIP

20 kΩ

2.1.5.5 Sensing-Resistor Selection (S5)

NON-LATCHING RF TRIP

100 kΩ

Set switch S5 to the resistance of the sensing resistor. For the

ER-600VC, ER-5KV, and ER-5WP, select 20 kΩ. For the ER-15KV, ER-

25KV, and ER-35KV, select 100 kΩ. Switch S5 sets the resistor-fault

trip value and the V_NTRIP LEVEL range. See Section 2.1.3.

60 Hz

50 Hz

NOT USED

RUN

UPGRADE

2.1.5.6 Frequency (S6)

Set switch S6 to 50 or 60 Hz to tune the digital ﬁlter to the line

frequency of the monitored system.

NOTE:

1. DEFAULT SETTINGS SHOWN.

2.1.5.7 Upgrade Mode (S8)

FIG. 1. Conﬁguration switches.

The microSD card is used for ﬁrmware upgrades. See Section

4.1.2 for upgrade instructions.

2.1.5.1 Relay K1 Function (S1)

NOTE: An upgrade causes an SE-330 restart and this may cycle the

output relays.

Set switch S1 to K1 = TRIP to assign the trip function to relay K1

and to activate switch S2. With the default setting, relay K1 will

change state when a resistor-fault or ground-fault trip occurs. Other

trip functions can be assigned to K1 using SE-MON330 software or

via network communications.

2.1.6 Resistor-Fault Trip Time

The resistor-fault trip time can be adjusted from from 12 seconds

(the default) to as much as 60 seconds using the SE-MON330

software or via network communications.

Set switch S1 to K1 = PULSING to conﬁgure relay K1 for pulsing

operation. See Section 2.3.

2.1.7 Resistor-Fault Trip Level

2.1.5.2 Trip-Relay Mode And Trip-Memory Mode (S2)

The resistor-fault trip level can be adjusted using the SE-MON330

software or via network communications. See Section 6.1.

Set switch S2 to select the operating mode of trip relay K1. In the

non-fail-safe mode, relay K1 energizes and its contact closes when

a trip occurs. The non-fail-safe mode can be used to trip shunt-trip

circuit breakers. In the non-fail-safe mode, SE-330 trips are reset

when supply voltage is cycled.

2.1.8 Geo-Magnetic Filter

A low-frequency ground current can be caused by the Earth’s

magnetic ﬁeld and from charged clouds passing overhead during

a thunderstorm. In some conditions, this can cause a false resistor-

fault trip. Enabling the geo-magnetic ﬁlter and increasing the

resistor-fault trip time can help counteract these effects.

In the fail-safe mode, relay K1 energizes and its contact will

close if there are no trips. The contact will open in the event of a

trip, a loss of supply voltage, or a processor failure. In the fail-safe

mode, SE-330 trips are not reset when the supply voltage is cycled.

A trip time of 30 seconds is recommended when the

geo-magnetic ﬁlter is enabled.

NOTE: Switch S2 does not affect the operating modes of relays

K2, K3, and K4.

The geo-magnetic ﬁlter is disabled by default but can be enabled

using the SE-MON330 software or via network communications.

NOTE: Switch S2 only affects relay K1 operating mode when K1 is

assigned the trip function (switch S1 set to K1 = TRIP). Trip memory

is enabled when K1 is set to the fail-safe mode, regardless of the

switch S1 setting.

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SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

2.2 Calibration

2.4 Trip Indication And Reset

The SE-330 measures the resistance change of the NGR

relative to the NGR-resistance value that was determined at the

time of calibration. When the resistance change is greater than

the threshold amount (500 Ω for 20-kΩ systems and 2,500 Ω for

100-kΩ systems), a resistor-fault trip will occur. The SE-330 should

be calibrated for new installations, or if the NGR or the sensing

resistor is changed.

Red LEDs and indication relays indicate ground-fault and

resistor-fault trips. The indication relays K2 (default is GF) and K3

(default is RF) operate in either fail-safe or non-fail-safe mode. The

default is non-fail-safe mode. In this mode, the relays are energized

when a fault occurs. The relay mode setting is stored in non-volatile

memory and can be set using the SE-MON330 software or network

communications.

NOTE: If the SE-330 is not calibrated and is supplied from the load

side of the breaker (non-fail-safe mode), calibrate it within the

resistor-fault trip time after power-up or it may trip and interrupt its

supply. See Section 2.1.6.

When a trip occurs with latching operation selected, the

SE-330 remains tripped until the unit is reset with the front-panel

RESET button or the remote-reset input. See Sections 2.1.5.3 and

2.1.5.4. Terminals 15 and 16 are provided for remote reset as

shown in Fig. 3. The reset circuit responds only to a momentary

closure so that a jammed or shorted button does not prevent a trip.

The front-panel RESET button is inoperative when terminal 15 is

connected to terminal 16. If non-latching operation is selected, trips

and corresponding indication will automatically reset when the

fault clears. In addition, the power-up trip memory will be ignored

even when conﬁguration switch S2 is set to fail-safe. The maximum

automatic reset time is 2.8 s.

The CALIBRATION button is located behind the access cover on

the front panel, and is recessed to prevent inadvertent activation.

NOTE: Calibration must be performed with the SE-330 connected

to the sensing resistor and NGR of the installed system.

To calibrate the SE-330, press and hold the CALIBRATION

button until the green CALIBRATED LED turns off and then turns

on (if the LED is already off, press and hold down the button until

the LED turns on). Calibration takes approximately two seconds.

If calibration is not successful a resistor-fault trip occurs, the

RESISTOR FAULT TRIP LED will be on, the CALIBRATED LED will be

off, and the DIAGNOSTIC LED will ﬂash the calibration-error code.

See Section 2.8.

The red DIAGNOSTIC LED annunciates latched calibration-error

and remote trips. See Section 2.8.

When supply voltage is applied with switch S2 set to

FAIL-SAFE, then the SE-330 returns to its state prior to loss of

supply voltage unless switch S3 or S4 is set to non-latching. SE-330

trips reset when the supply voltage is applied with switch S2 set to

NON-FAIL-SAFE. When a local, remote, or network reset is issued,

both trip LEDs will ﬂash if they are off.

The SE-330 may be calibrated remotely using the SE-MON330

software with the USB interface or the communications options.

If the resistor fault (switch S4) is selected, the calibration-error

code ﬂashes until RESET is pressed even if the CALIBRATED LED is

on.

Resistor-fault-trip reset can take up to one second.

Resistor-fault trip-memory trip can take up to three seconds once

the relay powers up.

The calibration value is stored in non-volatile memory.

2.5 Remote Operation

2.3 Pulsing Operation

Relays K2 and K3 can be used for remote indication, and terminals

15 and 16 are provided for remote reset. RK-332 Remote Indication

and Reset components are shown in Fig. 18. Connect them as

shown in Fig. 3. RK-332 components are not polarity sensitive.

If switch S1 is set to K1 = PULSING, pulsing occurs when terminal

16 is connected to terminal 17. Relay K1 operates at a 50% duty

cycle. The duration of each cycle can be adjusted from 1.0 to 3.0

seconds. When terminals 16 and 17 are not connected, K1 is not

energized and its contact is open.

Indication relays can be set to fail-safe or non-fail-safe operation

using the SE-MON330 software or network communications. The

default mode is non-fail-safe. In non-fail-safe mode, relays energize

on fault.

Relay K1 can be used to control a contactor that is rated for use

at the line-to-neutral voltage. The contactor causes changes in

neutral-to-ground resistance by adding or shorting portions of the

NGR. See Section 3.5. Pulsing ground-fault current appears as zero-

sequence current upstream from the fault.

Network-enabled SE-330s can be remotely tripped and reset by

the network master. The red DIAGNOSTIC LED indicates a network-

initiated trip. See Section 2.8. Refer to the appropriate SE-330

communications manual.

Pulsing ground-fault current is distinguishable from charging

current and noise, and it can be traced with a clip-on ammeter or

current probe. If a pulsing current is detected on a cable or conduit,

then the fault is downstream. Systematic testing allows faults to be

located without isolating feeders or interrupting loads.

Stop pulsing when a fault is located.

Page 6

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

2.6 Relay K1 LED

The yellow RELAY K1 LED follows the state of relay K1 and is on

when K1 is energized (contact closed).

2.7 Unit Healthy Output

The UNIT HEALTHY relay K4 provides a basic status of processor

health, which is energized when the processor is operating. It can

be ordered with N.O. or N.C. contacts. See section 7.

An ENHANCED HEALTH status can be assigned to relays K1, K2,

and K3. See Section 2.9.

UNIT HEALTHY relay K4 is energized when the processor is

operating. It can be ordered with N.O. or N.C. contacts. See Section 7.

NOTE: The K4 output changes state momentarily during a

processor reset.

FIG. 2. Analog-output connections.

3. INSTALLATION

3.1 SE-330

NOTE: K4-contact rating is 100 mA maximum.

2.8 Diagnostic LED

Outline and panel-cutout dimensions for the SE-330 are shown

in Fig. 4. To panel mount the SE-330, insert it through the panel

cutout and secure it with the fourincluded 8-32 locknuts and ﬂat

washers.

The DIAGNOSTIC LED is used to annunciate trips without

individual LED indication. The number of short LED pulses between

pauses indicates the cause of the trip.

If an optional SE-IP65CVR-G hinged cover is used, follow the

included installation instructions. See Figs. 6 and 7.

By default, only critical diagnostic ﬂash codes are shown. Non-

critical diagnostic codes include SD Card status and USB Error

status. All other diagnostic codes are considered critical.

All connections to the SE-330 are made with plug-in, wire-

clamping terminal blocks. Each plug-in terminal block can be secured

to the SE-330 by two captive screws for reliable connections.

Starting with SE-330 ﬁrmware version 2.60 and SE-MON330

software version 3.8, the SE-330 can be conﬁgured to show

only critical diagnostic codes. In this conﬁguration, only critical

diagnostic codes will be indicated with the DIAGNOSTIC LED.

Diagnostic messages are always visible with the SE-MON330

software. See Sections 4.2 and 5.

Outline dimensions and mounting details for surface mounting

the SE-330 are shown in Fig. 5. Fasten the optional surface-mount

adapter to the mounting surface and make connections to the

adapter terminal blocks. Follow Fig. 5 instructions to mount or

remove the SE-330.

2.9 Enhanced Health Status

Ground terminal 7 (G) and connect terminal 6 (R) to the sensing-

resistor R terminal.

The Enhanced Health Status can be assigned to relays K1, K2,

and K3 (ﬁrmware version 3.00 and higher). The assigned relay(s)

will trip when a critical diagnostic code occurs. See Section 5 for a

list of critical diagnostic codes.

Use terminal 1 (L1) as the line terminal on ac systems, or the

positive terminal on dc systems. Use terminal 2 (L2/N) as the

neutral terminal on ac systems or the negative terminal on dc

systems. Connect terminal 3 ( ) to ground.

2.10 Analog Output

NOTE: Disconnect terminal 1 (L1) and terminal 2 (L2/N) before

performing dielectric strength testing of the control panel.

An isolated 4–20-mA output indicates NGR current with full-

scale output corresponding to the CT rating. An internal 24-VDC

supply allows the analog output to be connected as a self-powered

output. Power from an external supply is required for loop-powered

operation. See Fig. 2. A PGA-0520 analog meter can be panel-

mounted to display the NGR current. See Fig. 19 and Section 7.

NOTE: Connections to terminals 4 (SPG) and 5 (SPGA) are not

required when using the SE-330 hardware revision 10 and higher.

However, it is recommended to connect terminal 4 to terminal 5

to maintain backwards compatibility with the older SE-330 series

(hardware revision 04A and lower).

Page 7

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

TRANSFORMER

OR GENERATOR

NOTE 1

NEUTRAL

NOTE 16

NOTE 2

NOTE 12

NOTES 11 ꢁ 12

EFCT-ꢀꢁ

ELCTꢂ-ꢀꢁ

OR

C

XXX:1

OR XXX:5

ELCT30-ꢀ

NOTE ꢂ

N

ER SERIES

SENSING

RESISTOR

NOTE 1ꢄ

8

ꢀ

1

10 11

ꢀ

10 11

NGR

S

5

C

S

1

5

C

5 A

1 A

EFCT

NOTE 4

SE-330

G

R

6

ꢄ

R

ALTERNATE CT

CONNECTIONS

G

NOTE 5

N/- SUPPLY

L/ꢃ SUPPLY

NOTE 6

ꢅ1

1

2

L1

L2/N

NOTES:

1. USE SEPARATE LUG TO CONNECT

NOTE 1ꢂ ꢁ 14

22

2ꢂ

C

ꢅ2

GF

24

26

SENSING-RESISTORTERMINAL NTO NEUTRAL.

GROUND

FAULT

2. LOCATETHESE COMPONENTS NEAR

TRANSFORMER OR GENERATOR.

25

2ꢄ

ꢅꢂ

RF

2ꢀ

ꢂ. ALTERNATE SENSING-RESISTOR

TERMINAL-N CONNECTION.THE NEUTRAL

CONNECTION IS NOT MONITORED.

RESISTOR

FAULT

28

ꢅ4

12

14

1ꢂ

18

4. VOLTAGE BETWEEN SENSING-RESISTOR

TERMINALS R AND G IS LIMITEDTO 100 V BY

INTERNAL CLAMP.

UNIT HEALTHY

NOTE ꢄ

ꢃ24V

NO

NOTE 8

CONNECTION

1ꢀ

20

21

+

5. SEE SECTION ꢂ.4 FOR ISOLATED-GROUND

CONNECTION.

NOTE 14

ANALOG OUTPUT

15

-

REMOTE

RESET

NOTE 15

RESET

6. RELAY CONTACTS SHOWN WITH SE-ꢂꢂ0

DE-ENERGIꢆED.

16

1ꢄ

ꢂ

0V

PGA-0520

PULSE

ENABLE

PULSE ENABLE

ꢄ. OPTIONAL N.C. ꢅ4 AVAILABLE.

USB PORT

NOTE ꢀ

8. LOOP-POWERED CONNECTION USES

TERMINALS 1ꢀ AND 20 ONLY.

4

5

SPG

NOTE 18

SPGA

ꢀ. MINI-B USB DEVICE CONNECTOR.

MICRO SD

SLOT

OPTIONAL

NETWORꢅ COM

NOTE 10

SE-330

10. REFERTO APPROPRIATE SE-ꢂꢂ0

COMMUNICATIONS INTERFACE MANUAL.

11. TWO-CONDUCTORTWISTED CABLE

REꢇUIRED, SHIELDED RECOMMENDED.

INDICATION

GROUND-FAULT

TRIP

R

G

Y

G

12. CT CONNECTION IS NOT POLARITY-SENSITIVE.

RESIS-

TOR-FAULT TRIP

1ꢂ. CONNECT CONTACTS ꢅ1, ꢅ2, ꢅꢂ, AND ꢅ4

AS REꢇUIRED FOR PROTECTION,

INDICATION, AND CONTROL.

DIAGNOSTIC

CALIBRATED

RELAY ꢅ1

14. EXTERNAL LIGHTS AND SWITCHES NOT

INCLUDED WITH SE-ꢂꢂ0.

15. SELF-POWERED 4-20 mA OUTPUT.

16. TYPICALTRIPPING SYSTEM.

POWER

1ꢄ. GROUND CURRENT SENSOR ATTERMINAL 11

ONLY.

18. CONNECTION NOT REꢇUIRED. SEE SECTION ꢂ.1

FOR COMPATABILITY WITH OLDER SE-ꢂꢂ0

SERIES.

FIG. 3. SE-330 connection diagram.

Page 8

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

16.0

(0.6ꢁ)

1ꢁ2.0

(5.20)

ꢀ8.ꢁ

PANELTHICꢃNESS

1.6 (0.06)TO 4.8 (0.1ꢀ)

(ꢁ.8ꢂ)

LITTELFUSE STARTCO

NEUTRAL-GROUNDING-RESISTOR SE-330

MONITOR

GROUND

FAULT

RESISTOR

FAULT

12

K4

13

UNIT

HEALTHY

TRIP

DIAGNOSTIC

CALIBRATED

RELAꢌ ꢍꢁ

TRIP

NC - 14

-

15

RESET

16

1

L1

2

3

4

5

L2/N

PULSE ENABLE

17

24V - 18

-

SPG

+

SPGA

+

ANALOG OUTPUT

1 9

20

-

ꢄ0

ꢄ00

0V - 2 1

ꢁ0

ꢄ

ꢅ0

ꢁꢃ0

ꢁ30

ꢁ00

ꢇ0

ꢄ0

3ꢅ0

ꢆ00

ꢁꢄ00

ꢆ

ꢇ

ꢇ0

ꢆ0

ꢁ00

MEM

POWER

ATTENTION

ꢅ

ꢁꢃ00

ꢄ000

DISENGAGE CAPTIVE RETAINING

SCREWS BEFORE REMOVING

PLUG-IN TERMINAL BLOCKS

GF TRIP LEVEL

ꢈꢋ CT RATINGꢊ

V

N

TRIP_ΩLEVEL_Ω

ꢄ0

ꢍ

ꢁ00 ꢍ

ꢊ

VN ꢎ ꢂ

ꢈ

Sꢂ

VN

ꢎ ꢁ

0ꢀꢃ

ꢄꢀ0

ꢄꢀꢄ

0ꢀꢂ

0ꢀꢅ

ꢁꢀ0

ꢄꢀ0

ꢁꢀꢆ

ꢁꢀꢇ

ꢁꢀꢅ

ꢁꢀꢄ

ꢁꢀ0

CAL

ꢄꢀꢅ

ꢄꢀꢇ

ꢄꢀꢆ

22

23

K1

0ꢀ3

0ꢀꢄ

0ꢀꢁ

3ꢀ0

ꢂꢀ0

ꢁ0ꢀ0

-

6

7

R

G

SENSING

RESISTOR

3ꢀ0

PULSE PERIODꢈꢉꢊ

GF TRIP TIME ꢈꢉꢊ

24

25

26

27

28

29

GROUND

FAULT

K2

-

8

S

1

-

E

F

C

T

9

RESISTOR

FAULT

K3

1

A

10

1 1

5

C

5

A

RESET

FRONT VIEW

SIDE VIEW

REAR VIEW

ꢀ2.ꢂ

(ꢁ.65)

ꢂ6.2

(ꢁ.00)

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

8.2

(0.ꢁ2)

Rꢄ4.8 (0.1ꢀ)

MAXIMUM

4.ꢂ5 (0.18ꢂ) DIA

4 LOCATIONS

PANEL-MOUNT CUTOUT

FIG. 4. SE-330 outline and panel-mounting details.

Page 9

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

114.ꢀ

(4.50)

8.0

(0.ꢀ1)

ꢁ8.ꢀ

(ꢀ.8ꢂ)

1ꢀ8.0

(5.4ꢀ)

RETAINER SCREW

RETAINER

LITTELFUSE STARTCO

NEUTRAL-GROUNDING-RESISTOR SE-330

MONITOR

GROUND

FAULT

RESISTOR

FAULT

12

UNIT

HEALTHY

K4

13

TRIP

DIAGNOSTIC

CALIBRATED

RELAꢌ ꢍꢁ

TRIP

14 - NC

15

-

L1

1

RESET

16

17

L2/N

2

3

4

5

2

3

4

5

PULSE ENABLE

18 - 24V

+

1 9

20

SPG

-

+

SPG A

ANALOG OUTPUT

-

ꢄ0

ꢄ00

2 1 - 0V

ꢁ0

ꢄ

ꢅ0

ꢁꢃ0

ꢁ30

ꢁ00

ꢇ0

ꢄ0

3ꢅ0

ꢆ00

ꢁꢄ00

ꢆ

ꢇ

ꢇ0

ꢆ0

ꢁ00

MEM

POWER

ꢅ

ꢁꢃ00

ꢄ000

GF TRIP LEVEL

ꢈꢋ CT RATINGꢊ

V

N

TRIP_ΩLEVEL_Ω

ꢄ0

ꢍ

ꢎ

ꢁ00 ꢍ

ꢊ

VN ꢎ ꢂ

ꢈ

Sꢂ

V

N

ꢁ

0ꢀꢃ

ꢄꢀ0

ꢄꢀꢄ

0ꢀꢂ

0ꢀꢅ

ꢁꢀ0

ꢄꢀ0

ꢁꢀꢆ

ꢁꢀꢇ

ꢁꢀꢅ

ꢁꢀꢄ

ꢁꢀ0

CAL

ꢄꢀꢅ

ꢄꢀꢇ

ꢄꢀꢆ

22

23

K1

0ꢀ3

0ꢀꢄ

0ꢀꢁ

3ꢀ0

ꢂꢀ0

ꢁ0ꢀ0

-

R

6

7

6

7

SENSING

RESISTOR

-

G

3ꢀ0

PULSE PERIODꢈꢉꢊ

GF TRIP TIME ꢈꢉꢊ

24

25

26

27

28

29

GROUND

FAULT

K2

-

S

1

8

9

8

9

E

F

C

T

RESISTOR

FAULT

1

A

5

C

10

5

A

K3

RESET

1

1 1

FRONT VIEW

SE-ꢀꢀ0-SMA

FRONT VIEW

SIDE VIEW

6ꢀ.5

25.4

(2.50)

(1.00)

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. MOUNTING SCREWS: M4 OR 8-ꢀ2 PANHEAD.

INSTALLATION

(NOTE 2)

1. LOOSEN RETAINER SCREWS, MOVE RETAINERS

OUTWARD AND TIGHTEN RETAINER SCREWS.

2. MATE MONITOR WITH ADAPTER PLUG-INTERMINALS.

LOOSEN RETAINER SCREWSTO LET RETAINERS

SNAP OVER MONITOR BACꢄPLATE.

ꢀ. ENSURETHAT RETAINERS ARE AGAINST MONITOR

BODY ANDTIGHTEN RETAINER SCREWS.

REMOVAL

1. LOOSEN RETAINER SCREWS, SLIDE RETAINERS AWAY

FROM MONITOR BODY ANDTIGHTEN RETAINER SCREWS.

BEꢃEL OUTLINE

2. PULL MONITOR FORWARD.

ADAPTER PANEL OUTLINE

MOUNTING DETAIL

FIG. 5. SE-330 outline and surface-mounting details.

Page 10

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

TO PREVENT UNAUTHORIꢃED ENTRY:

1. USE WIRE SEALTHROUGH HOLES IN

WEATHERPROOF COVER ASSEMBLY, OR

2. SECURE WITHTHE PLASTICTHREAD FORMING

SCREW SUPPLIED IN ꢄIT.

TOP VIEW

SHOWN

WITH

SEAL

HOLE FOR

SEAL WIRE

12ꢂ.0

(5.00)

FRONT VIEW

SIDE VIEW

NOTES:

1. DIMENSIONS SHOWN IN MILLIMETRES (INCHES).

2. SHOWN WITH WEATHERPROOF SNAPS CLOSED.

ꢀ. REFERTO PANEL MOUNTING CUTOUT (FIG. 4) FOR PANEL

MOUNTING DETAIL.

FIG. 6. SE-IP65CVR-G weatherproof cover outline.

Page 11

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

INSTALL O-RING INTO

GROOVE INTHE REAR

OF WEATHERPROOF

WINDOW

INSERTTHE SE-ꢀꢀ0 THROUGH OPENING

OF THE WEATHERPROOF WINDOW UNTIL IT

IS SECURELY NESTED TO THE BACꢁ OF THE

DARꢁ GREY PVC PANEL.

INSTALL O-RING INTOTHE GROOVE INTHE REAR

OF WEATHERPROOF WINDOW ASSEMBLY.

FRONT PANEL

DETAILS NOT SHOWN.

INSERT ASSEMBLY INTO PANEL AND FASTEN WITH

THE HARDWARE PROVIDED WITHTHE SE-ꢀꢀ0.

FIG. 7. SE-IP65CVR-G weatherproof cover installation.

Page 12

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

If a ground fault in the sensing-resistor conductor is unlikely

and it does not pass through the ground-fault-CT window, then

protection will be minimally lost. See Note 3 in Fig. 3.

3.2 Sensing Resistor

Outline and mounting details for the ER-600VC, ER-5KV, ER-

5WP, ER-15KV, ER-25KV, and ER-35KV sensing resistors are shown

in Figs. 8, 11, 12, 13, 14, and 15. Install the NGR and the sensing

resistor near the transformer or generator. When installed outdoors,

a sensing resistor must be installed in a suitable enclosure. An

optional SE-MRE-600 Moisture-Resistant Enclosure is available for

applications that may expose an ER-600VC to moisture. See Figs.

9 and 10. The weather-protected ER-5WP shown in Fig. 12 is an

ER-5KV with moisture-resistant terminal covers. Use an ER-5WP in

applications in which it might be exposed to moisture. The ER-15KV,

ER-25KV, and ER-35KV include moisture-resistant terminal covers.

Use suitable water-tight ﬁttings. Ground sensing-resistor terminal

G. Pass the sensing-resistor-to-neutral conductor and the NGR-to-

neutral conductor through the ground-fault-CT window as shown

in Fig. 3. Separately connect sensing-resistor terminal N and the

NGR to the neutral to include neutral connections in the monitored

loop. Alternatively, if the NGR connection to system neutral does

not need to be monitored, connect terminal N to the NGR neutral

terminal.

NOTE: Voltage at terminal N rises to line-to-neutral voltage when

a ground fault occurs. The same clearances are required for sensing

resistors as for NGRs.

NOTE: A parallel ground path created by moisture can result in a

false resistor-fault trip. Moisture sources include wind-driven rain

or snow, and condensation. Sensing-resistor terminal R and its

connection to SE-330 terminal R, including interposing terminal

blocks, must remain dry.

NOTE: The neutral-to-sensing-resistor-terminal-N connection is

not a neutral conductor as deﬁned in Canadian Electrical Code Rule

10-308 and National Electrical Code Section 250.36(B). It is not

required to be 8 AWG (8.36 mm²) or larger. Since current through

this conductor is always less than 250 mA, a 14 AWG (2.08 mm²)

conductor insulated to the system voltage is sufﬁcient.

RATINGS:

MAXIMUM VOLTAGE

600 Vac

.

MAXIMUM CURRENT ꢀ0 mA

RESISTANCE

THERMAL:

20 ꢁΩ

. . . . . . .

600 Vac

6 MINUTES ON,

60 MINUTES OFF

CONTINUOUS

. . . . . . . . . .

41.5

40.0

(1.6ꢀ)

(1.5ꢂ)

420 Vac

. . . . . . . . . .

10.5

40.0

22.2

10.5

(0.41)

1ꢄ.0

(0.41)

(1.5ꢂ)

(0.8ꢂ)

(0.ꢂ5)

NOTE ꢀ

N

R

G

ER-600VC

SENSING RESISTOR

20 KΩ

600 VAC MAX

4.5 (0.18) DIA

CꢃBORE 10.0 (0.ꢀꢄ) DIA

ꢀ.2 (0.1ꢀ) DEEP

FRONT

SIDE

MOUNTING DETAIL

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. TERMINAL-BLOCꢅ SCREWS: 6-ꢀ2 ꢆ 0.25.

ꢀ. MOUNTING SCREWS: M4 OR 8-ꢀ2.

4. ON REVISION 2 UNITS ENCLOSURE IS ELECTRICALLY CONNECTEDTO

TERMINAL G THROUGH JUMPER FROMTERMINAL G TO SCREW.

THIS CONNECTION MAY BE REMOVED FOR DIELECTRIC STRENGTH

TESTING. ENSURETHAT THE JUMPER IS INSTALLED AFTER TESTING.

5. ON REVISION 1 UNITS, SCREW IS NOT PRESENT AND ENCLOSURE IS

ELECTRICALLY CONNECTEDTOTERMINAL G.

6. NOT ALL CERTIFICATIONS SHOWN.

FIG. 8. ER-600VC sensing resistor.

Page 13

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

GASꢀET

120.4

(4.ꢁ4)

120.4

(4.ꢁ4)

ENCLOSURE - TOP VIEW

COVER - INSIDE VIEW

(COVER REMOVED)

ꢃ.5

82.5

(ꢂ.25)

(0.ꢂ8)

M6 OR 0.25-20

120.4

(4.ꢁ4)

ENCLOSURE - TOP VIEW

MOUNTING DETAIL

120.4

(4.ꢁ4)

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. MOUNTING SCREWS: M6 OR 0.25-20.

ENCLOSURE - SIDE VIEW

FIG. 9. SE-MRE-600 moisture-resistant enclosure outline.

Page 14

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

NOTE 2

MOUNTING

SCREWS

FOUR LOCATIONS

NOTE 4

4 LOCATIONS

NOTE 4

N

R

G

NOTE ꢁ

ER-600VC

SENSING RESISTOR

20 KΩ

600 VAC MAX

NOTE 2

COVER - INSIDE VIEW

ENCLOSURE - TOP VIEW

(COVER REMOVED)

ASSEMBLY INSTRUCTIONS

1. DRILL HOLE FOR ENCLOSURE WIRE ENTRY. USE LIꢀUID-TIGHT FITTING.

2. REMOVE NYLON NUTS AND WASHERS. INSERT ER-600VC INTO ENCLOSURE. REPLACE NUTS AND WASHERS.

ꢁ. ATTACH GROUND WIRE FROM ENCLOSURETO COVER AND TO ER-600VC TERMINAL G.

4. MOUNT SE-MRE-600 IN PLACE USING M6 OR 0.25-20.

5. COMPLETE OTHER WIRING AND REPLACE COVER.

FIG. 10. ER-600VC installed in SE-MRE-600.

Page 15

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

RATINGS:

MAXIMUM VOLTAGE

2,500 Vac

.

MAXIMUM CURRENT 125 mA

RESISTANCE . . . . . . .

20 ꢀΩ

. . . . . . . . . . CONTINUOUS

THERMAL

TORꢈUE

TERMINAL N (ꢁ LOCATIONS)

10-ꢁ2 INSERT

(50 lbf•in.)

. . . . . 5.6 N-m (50 in-lb)

OTHERS

. . . . . . . . . ꢃ.0 N-m ((880 ilnb-fl^•ibn).)

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. TERMINAL-BLOCꢅ SCREWS: 6-ꢁ2 ꢆ 0.25.

ꢁ. MOUNTING SCREWS: M6 OR 0.25-20.

4. THIS DEVICE CAN DISSIPATE

ꢁ00 WATTS.TO MINIMIꢇE SURFACE

TEMPERATURES FOR SYSTEMS

ALLOWEDTO OPERATE

CONTINUOUSLY WITH A GROUND

FAULT, MOUNT VERTICALLY WITH

R ꢄ GTERMINALS DOWN.

5. ON REVISION 2 UNITS BASE IS

ELECTRICALLY CONNECTEDTO

TERMINAL G THROUGH JUMPER

FROMTERMINAL G TO

SCREW.

THIS CONNECTION MAY BE

REMOVED FOR DIELECTRIC

STRENGTH TESTING. ENSURE

THAT THE JUMPER IS INSTALLED

AFTER TESTING.

6. ON REVISION 0 ꢄ 1 UNITS

IS NOT PRESENT AND BASE IS

ELECTRICALLY CONNECTED TO

TERMINAL G.

SCREW

ꢂ. CERTIFICATIONS NOT SHOWN.

FIG. 11. ER-5KV sensing resistor.

Page 16

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

RATINGS:

MAXIMUM VOLTAGE

2,500 Vac

.

MAXIMUM CURRENT 125 mA

RESISTANCE . . . . . . .

20 ꢈΩ

. . . . . . . . . . CONTINUOUS

THERMAL

TORꢅUE

TERMINAL N (ꢀ LOCATIONS)

10-ꢀ2 INSERT

(50 lbf•in.)

. . . . . 5.6 N-m (50 in-lb)

OTHERS

(80 lbf•in.)

. . . . . . . . . ꢂ.0 N-m (80 in-lb)

MIN DISTANCE

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. TERMINAL-BLOCꢃ SCREWS: 6-ꢀ2 ꢄ 0.25

½ NPT

CABLE ACCESS OPENING IS 1/2 NPT.

USE A LIꢅUID-TIGHT FITTING FOR

CABLE ENTRY.

MIN CLEARANCE FROM BASE

ꢀ. MOUNTING SCREWS: M6 OR 0.25-20.

4. THIS DEVICE CAN DISSIPATE

ꢀ00 WATTS.TO MINIMIꢆE SURFACE

TEMPERATURES FOR SYSTEMS

ALLOWEDTO OPERATE

CONTINUOUSLY WITH A GROUND

FAULT, MOUNT VERTICALLY WITH

R ꢇ GTERMINALS DOWN.

5. BASE IS ELECTRICALLY CONNECTED

TOTERMINAL G THROUGH JUMPER

FROMTERMINAL GTO SCREW.

THIS CONNECTION MAY BE REMOVED FOR

THIS CONNECTION MAY BE

DIELECTRIC STRENGTH TESTING.

ERNEMSUORVEETDHFAOTRTDHIEEJLUECMTPREIRCIS INSTALLED

AFTER TESTING.

STRENGTH TESTING. ENSURETHAT

THE JUMPER IS INSTALLED AFTER

6. CERTIFICATIONS NOT SHOWN.

TESTING.

6. CERTIFICATIONS NOT SHOWN.

FIG. 12. ER-5WP sensing resistor.

Page 17

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

FIG. 13. ER-15KV sensing resistor.

Page 18

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

RATINGS:

MMAAXXIVMOULMTAVGOELT. A. .G. .E. ...14,400 Vac

14,400 Vac

MAX CURRENT . . . . . . .144 mA

.

MAXIMUM CURRENT

RESISTANCE

THERMAL

144 mA

100 ꢂΩ

. . . . . . .

. . . . . . . . . 11 MMIINNUOTNE,ON,

14,400 Vac

120 MIN

120 MINUTES

OFF

CONTINUOUS

. . . . . . . . .

2,500 Vac

TORꢆUE

TERMINAL N

(80 lbf•in.)

. . . . . . .ꢃ.0 N-m (80 in-lb)

NOTES:

1. DIMENSIONS IN

MILLIMETRES (INCHES).

2. TERMINAL-BLOCꢄ SCREWS:

6-ꢁ2 ꢅ 0.25.

ꢁ. MOUNTING SCREWS:

M6 OR 0.25-20

MIN CLEARANCE FROM BASE

4. USE LIꢆUID-TIGHT FITTING

FORTERMINAL-BLOCꢄ-

ENCLOSURE CABLE ENTRY.

MIN DISTANCE

5. MOUNT AS SHOWN

WITH BASE HORIꢇONTAL.

6. CERTIFICATIONS NOT SHOWN.

FIG. 14. ER-25KV sensing resistor.

Page 19

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

RATINGS:

MAX VOLTAGE . . . . . . . .2222,,000000VVaacc

.

MAXIMUM VOLTAGE

220 mA

MAX CURRENT . . . . . ... 220 mA

MAXIMUM CURRENT

. . . . . . .

RESISTANCE

THERMAL

100 ꢂΩ

1 MIN ON,

. . . . . . . . . 1 MINUTE ON,

22,000 Vac

120 MIN

120 MINUTES

OFF

CONTINUOUS

. . . . . . . . . .

ꢀ,000 Vac

TORꢆUE

TERMINAL N

. . . . . . . ꢁ.0 N-m ((8800 ilnb-fl^•bin).)

MIN CLEARANCE FROM BASE

MIN DISTANCE

NOTES:

1. DIMENSIONS IN MILLIMETRES (INCHES).

2. TERMINAL-BLOCꢄ SCREWS: 6-ꢀ2 ꢅ 0.25.

ꢀ. MOUNTING SCREWS: M6 OR 0.25-20.

4. USE LIꢆUID-TIGHT FITTING FOR

TERMINAL-BLOCꢄ-ENCLOSURE CABLE ENTRY.

5. MOUNT AS SHOWN WITH BASE HORIꢇONTAL.

6. CERTIFICATIONS NOT SHOWN.

FIG. 15. ER-35KV sensing resistor.

Page 20

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

3.3 Ground-Fault CT

Select and install a ground-fault CT that will provide the desired

trip level. Typically, the CT-primary rating should be approximately

equal to the NGR let-through-current rating. This provides an

appropriate GF TRIP LEVEL setting range and analog-output scaling.

See Sections 2.1.2 and 2.9.

The outline and mounting details for the ELCT5- and ELCT30-

series current sensors are shown in Fig. 16 and Fig. 17. Ground-

fault-CT connections and the typical ground-fault-CT location are

shown in Fig. 3.

For SE-325 replacement applications, the existing CT200

current sensor will typically have to be replaced. However, where

a replacement is not necessary or possible, the CT200 can be

connected to either the 1- or 5-A input. This CT has a 200:5 current

ratio. If connected to the 1-A input, the ground-fault trip level will

be a percentage of 40 A. See Section 2.1.2.

The accuracy of a typical current sensor, including the CT200, will

decrease when below 5% of its current rating. CT-primary current-

injection testing is recommended to verify trip levels below 5% of

the CT-primary rating. See Section 9.4. Littelfuse Startco current

sensors with a 50-mA-secondary rating, such as the ELCT5-x and

ELCT30-series, are designed for use at low levels and respond

linearly to 2% current rating.

NOTE: The current-sensor insulation class is of no consequence if

its secondary is grounded and the conductors through its window

are insulated for the system voltage. Medium-voltage systems may

require a bushing-type CT.

Page 21

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

137.69

[5.421]

87.73

[3.454]

115.59

[4.551]

TOPVIEW AND MOUNTING DETAIL

FRONTVIEW

7.62

[0.300]

NOTES:

1. DIMENSIONS IN MILLIMETERS [INCHES].

2. MOUNTING SCREWS: M6 OR 1/4”.

SIDEVIEW

FIG. 16. ELCT5-88 and ELCT30-88 ground-fault current sensors.

Page 22

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

72.64

[2.860]

31.56

[1.243]

55.97

[2.204)

TOPVIEW AND MOUNTING DETAIL

FRONTVIEW

7.62

[ 0.300]

NOTES:

1. DIMENSIONS IN MILLIMETERS [INCHES].

2. MOUNTING SCREWS: M5 OR #10.

SIDEVIEW

FIG. 17. ELCT5-31 and ELCT30-31 ground-fault current sensors.

Page 23

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

MILLIMETERS

FIG. 18. RK-332 remote indication and reset.

FIG. 19. PGA-0520 analog percent current meter.

Page 24

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

3.4 Isolated Ground Connection

An isolated ground bed can prevent a ground potential rise (GPR)

from being transferred to remote equipment. If the G terminals on

the sensing resistor and the SE-330 are connected to an isolated

ground, then the SE-330 will be exposed to the GPR. If the GPR

is greater than the terminal-block rating, then the SE-330 must be

isolated from station ground and precautions must be taken with

the power supply and the trip contacts. See Technical Note RG-1

“NGR Monitoring with Isolated Ground Beds” at

www.littelfuse.com/relayscontrols.

A conﬁguration that allows an SE-330 to be connected to

station ground is shown in Fig. 20. The SE-330 monitors the

series combination of the NGR and the two ground beds. This

conﬁguration is acceptable provided the series resistance of the

NGR and the ground beds is within the NGR calibration range

and groundbed-resistance changes remain within the trip range.

See Section 6.1.

FIG. 21. Simpliﬁed pulsing connection.

FIG. 20. Simpliﬁed isolated-ground connection.

3.5 Pulsing Connection

Set switch S1 to K1 = PULSING. Use an external switch to use

relay K1 to control a pulsing contactor (see Fig. 21). Relays K2 and

K3 can be used for tripping, and conﬁgured in the fail-safe or non-

fail-safe mode with the desired function using the SE-MON330

software.

Page 25

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

5. Set switch S8 back to RUN for normal operation. If a ﬁrmware

upgrade fails, then the existing ﬁrmware will not be overwritten.

4. DATA INTERFACES

4.1 SD Card

A record of the upgrade can be found in “upgrade_log_<SN>.txt”

on the microSD card. This ﬁle is updated each time an upgrade is

performed.

The SE-330 supports microSD data storage. The microSD card

port is located on the front panel just below the USB port. The

microSD card is used for short-term data logging of measured

values and for ﬁrmware upgrades.

NOTE: The maximum microSD card storage capacity is 32 GB for

SE-330 hardware revision 16 and higher. The maximum microSD

card storage capacity is 4 GB for SE-330 hardware revision 15 and

lower.

NOTE: SD card performance may vary by manufacturer, model,

and with varying environmental conditions. The included microSD

card has a temperature rating of -25 to 85°C (-13 to 140°F). For

applications colder than -25°C (-13°F), use an industrial-grade

microSD card.

4.2 USB Interface

Use the SE-MON330 software to access set-points, measured

values, and trip records through the Mini-B USB interface located

on the front panel. SE-MON330 version 4.0 or newer is required for

some set-points. The following information can be viewed:

NOTE: SD card usage is intended for use with the SE-330 only.

Do not store other data on the SD card because ﬁles may be

automatically deleted.

4.1.1 Datalogging

•

Front-panel and conﬁguration-switch settings

Neutral voltage and neutral current

Resistance change from the calibrated value

Trip status

When a microSD card is installed, the SE-330 looks for a

directory called “Datalogging.” If this directory exists, data logging

will automatically start after the card is indexed (indexing may take

several minutes depending on the size of the card and the number

of ﬁles).

Trip records, 100 date and time stamped

Firmware version and serial number

The log is updated every two seconds and includes the measured

values, conﬁguration parameters, and trip status. A new log ﬁle is

created at the start of each day. The most recent two months of log

ﬁles are retained.

The following values can be viewed and adjusted:

•

Ground-fault trip setting (when front-panel GF trip level is

set to MEM)

The red DIAGNOSTIC LED may indicate an SD Card error. See

Sections 2.8 and 5. Approximately 500 MB of data is generated per

month of logging.

•

K1, K2 and K3 relay assignement

K2 ground-fault relay output operating mode

K3 resistor-fault relay output operating mode

NGR Short Detection (multiple settings)

Clock settings

4.1.2 FIRMWARE UPGRADE

Firmware upgrades are performed using a microSD card in

conjunction with conﬁguration switch S8. See Section 2.1.5.7. The

SE-Flash software is not required.

To upgrade the SE-330 ﬁrmware, insert a microSD card containing

the ﬁrmware upgrade ﬁle (.S19 format) in the root directory of the

SD card and set switch S8 to UPGRADE within 30 seconds of card

installation. If S8 is switched to UPGRADE after 30 seconds, the

upgrade process will not occur. If the microSD card is inserted after

S8 is switched to UPGRADE, switch S8 to RUN and then back to

UPGRADE. The SE-330 evaluates ﬁrmware upgrade ﬁles found in

the root directory of the microSD card and uses the ﬁrst valid ﬁle.

Trip records can be cleared

Remote calibration

Resistor-fault trip time

Resistor-fault trip level

Geo-magnetic ﬁlter

Critical and non-critical diagnostic codes

Ensure that the DIAGNOSTIC LED is off before beginning the

ﬁrmware upgrade process.

Ensure the real-time clock is set to the correct time prior

to normal operation. Trip records and on-board datalogging

information include date and time readings from the clock. Refer to

the SE-MON330 software help ﬁle for further information.

The red DIAGNOSTIC LED blinks rapidly while the ﬁrmware

upgrade is running and the SE-330 may reset multiple times during

the upgrade process. Do not remove the SD card or power off the

SE-330 until the DIAGNOSTIC LED has stopped blinking rapidly

for at least 30 seconds. If the upgrade is not successful, then the

DIAGNOSTIC LED will indicate an SD upgrade error. See Section

Page 26

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

NOTE: SE-330 hardware revisions 10 and later include an internal

rechargeable battery that powers the real-time clock. Please

consult local regulations regarding the use of batteries in electrical

equipment. The SE-330 battery is not designed for user service or

removal; please contact Littelfuse with any questions regarding

battery removal.

4.3 Network Communications

The optional communications interfaces include a single CAN

port and dual Ethernet ports supporting cable, ﬁber⁽¹⁾, or both cable

and ﬁber. Protocols include:

•

DeviceNet over CAN (ordering option 1)

EtherNet/IP cable or ﬁber (ordering options 3, 4, and 5)

Modbus TCP over cable or ﬁber (ordering options 3, 4, and 5)

IEC 61850 over cable or ﬁber (ordering options 6, 7, and 8)

See Section 7 and refer to the appropriate SE-330 communications-

interface manual for details.

⁽¹⁾Uses the plug-in style SC connector.

Page 27

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

5. TROUBLESHOOTING

PROBLEM

DIAGNOSTIC LED

SOLUTION

FLASH CODE⁽¹⁾

POWER LED off.

Check if supply voltage is present in terminals 1 and 2. If present, an overvoltage

may have caused the power supply to shutdown. Cycle the supply voltage. If POW-

ER LED remains off, consult Littelfuse.

POWER LED ﬂashes.

A power-supply overload has occurred. Cycle supply voltage. If problem persists,

consult Littelfuse.

Calibration-Error Trip

DIAGNOSTIC LED ﬂash code

1 L - 1 S - 1 L

The total resistance of the NGR and sensing-resistor circuit is outside the calibration

range. Verify that switch S5 is set to match the resistance of the sensing resistor,

check the resistance of the NGR, and verify the sensing-resistor circuit. See Section

9.2 for sensing-resistor tests.

Repeat the calibration procedure after the open or shorted condition has been

corrected.

Critical diagnostic code.

GF LED⁽²⁾: No Change; RF LED⁽²⁾: ON; Assigned Relay: Trip

Remote Trip

DIAGNOSTIC LED ﬂash code

1 L - 2 S - 1 L

1 L - 4 S - 1 L

The SE-330 was tripped by a signal from network communications. Press RESET

to clear the trip.

Critical diagnostic code.

GF LED⁽²⁾: ON; RF LED⁽²⁾: ON; Assigned Relay: Trip

A/D-Converter-Error Trip

DIAGNOSTIC LED ﬂash code

An A/D-converter error was detected. Press RESET to clear the trip. If the problem

persists, consult Littelfuse.

Critical diagnostic code.

GF LED⁽²⁾: No Change; RF LED⁽²⁾: ON; Assigned Relay: Trip

SD Card

DIAGNOSTIC LED ﬂash code

1 L - 5 S - 1 L

SD card is full or a write error occurred. Delete ﬁles or use a different microSDcard.

Non-critical diagnostic code.

GF LED(2): No Change; RF LED(2): No Change; Assigned Relay: No Change

If this diagnostic was caused during an attempt to upgrade the ﬁrmware, follow

this alternative process:

•

Remove supply from SE-330.

Insert a microSD card containing the ﬁrmware upgrade ﬁle in the root directory

of the SD card.

Power on the SE-330.

Set switch S8 to UPGRADE within 30 seconds of startup.

The upgrade should continue as described in Section 4.1.2.

•

Watchdog Trip

DIAGNOSTIC LED ﬂash code

1 L - 6 S - 1 L

A watchdog trip results in a processor reset. During reset, UNIT HEALTHY relay

K4 will be de-energized. After a reset, UNIT HEALTHY relay K4 will be energized.

Press RESET to clear the trip. If the problem persists, consult Littelfuse.

Critical diagnostic code.

GF LED⁽²⁾: ON; RF LED⁽²⁾: ON; Assigned Relay: Trip

Non-Volatile Memory

Error Trip

DIAGNOSTIC LED ﬂash code

1 L - 8 S - 1 L

1 L - 9 S - 1 L

An error was detected in the non-volatile memory. Press RESET to clear the trip. If

the problem persists, consult Littelfuse.

Critical diagnostic code.

GF LED⁽²⁾: ON; RF LED⁽²⁾: ON; Assigned Relay: Trip

SD Upgrade Error

DIAGNOSTIC LED ﬂash code

An error occurred during the ﬂash-memory upgrade procedure. Ensure that the

ﬁrmware upgrade ﬁle is correct or use a different microSD card.

Critical diagnostic code.

GF LED⁽²⁾: No Change; RF LED⁽²⁾: No Change; Assigned Relay: No Change

Page 28

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

PROBLEM

USB Error

DIAGNOSTIC LED

SOLUTION

FLASH CODE⁽¹⁾

1 L - 10 S – 1 L

A USB algorithm timeout has been detected. Remove and reconnect the USB cable

and cycle supply voltage. If the problem persists, consult Littelfuse.

Non-critical diagnostic code.

DIAGNOSTIC LED ﬂash code

GF LED⁽²⁾: No Change; RF LED⁽²⁾: No Change; Assigned Relay: No Change

DIAGNOSTIC LED = solid red

SE-330 processor failed to start. Cycle supply. If problem persists, consult Littelfuse.

K1: De-energized.

Pressing RESET does not

clear trips.

Trip condition is still present. Locate and correct.

The RESET button is disabled if remote-reset terminals 15 and 16 are connected.

Replace shorted remote-reset switch or issue Reset command from the

communications network.

UNIT HEALTHY relay K4

momentarily changes state

Processor has been reset.

No analog-output current.

The output at terminals 19 and 20 requires a voltage source. See Fig. 2 for

analog-output connections. See Section 9.3 for the analog-output tests.

NOTES:

⁽¹⁾L = long pause, S = short ﬂash.

⁽²⁾When LED is on, corresponding indication relay is energized when in the non-fail-safe mode or de-energized when in the fail-safe mode.

Page 29

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

NGR Short Detection:

6. TECHNICAL SPECIFICATIONS

6.1 SE-330

Nominal NGR Resistance ...............15 to 2,000 Ω, 166 Ω

min for 100 kΩ

Supply:

sensing resistors

Option 0.......................................... 30 VA, 120 to 240 Vac

(+10, -45%), 50/60 Hz;

NGR Short Trip Level.......................10 to 70% of the nominal

NGR resistance

NGR Short Mode.............................Monitor only, monitor and

trip, disabled

Accuracy:

ER-600VC, ER-5KV, ER-5WP:

0 to 40°C ................................. 5 Ω typical, 10 Ω max

-40 to 60°C .............................. 12 Ω typical, 20 Ω max

ER-15KV, ER-25KV, ER-35KV:

20 W, 110 to 250 Vdc

(+10, -25%)

Option 2.......................................... 20 W, 48 Vdc

(+50, -25%);

35 VA, 48 Vac

(+10, -45%), 50/60 Hz

Power-Up Time....................................... 3 s at 120 Vac

0 to 40°C ................................. 30 Ω typical, 50 Ω max

-40 to 60°C .............................. 60 Ω typical, 100 Ω max

AC Measurements ................................. Discrete Fourier

Transform. 16 samples

per cycle, 50 or 60 Hz

Optimum Calibration

Temperature....................................Midpoint of local/installed

temperature range

Resistor-Fault Circuit:

Neutral-To-Ground Voltage Trip Levels⁽¹⁾:

ER-600VC or ER-5KV............... 20; 60; 100; 130; 170; 200;

340; 800; 1,200; 1,700;

Ground-Fault Circuit:

Trip Level.........................................2, 4, 6, 8, 10, 20, 40, 60,

80, 100% of CT-primary

2,000 Vac

rating or 2 to 100% using

MEM parameter

ER-15KV to ER-35KV............... 100; 300; 500; 650; 850;

1,000; 1,700; 4,000; 6,000;

Trip Time..........................................0.1, 0.2, 0.3, 0.4, 0.5, 0.7,

1.0, 2.0, 3.0, 5.0, 10.0 s

Trip-Level Accuracy:

8,500; 10,000 Vac

Accuracy................................. 10% of setting

3 dB Frequency Response:

EFCT-x, CS30-x.........................max of 1% of CT-primary

S6 = 50 Hz.....................25 to 85 Hz

S6 = 60 Hz.....................30 to 90 Hz

NGR Calibration Range:

rating or 3% of setting⁽²⁾

ELCT5-x, ELCT30-x...................max of 1% of CT-primary

rating or 5% of setting⁽²⁾

ER-600VC, ER-5KV, or

Trip-Time Accuracy..........................10% of setting, 20 ms

min

ER-5WP....................................0 to 2 kΩ

ER-15KV to ER-35KV................0 to 10 kΩ

3 dB Frequency Response:

Trip Resistance, V_N= 0:

S6 = 50 Hz .......................................25 to 85 Hz

S6 = 60 Hz .......................................30 to 90 Hz

Maximum CT lead resistance:

ELCT5 & ELCT30..............................5 Ω

Other CTs.........................................Consult CT curve

CT-Input Burden:

5-A Input ........................................< 0.01 Ω

1-A Input .........................................< 0.05 Ω

EFCT Input .......................................< 10 Ω

Thermal Withstand:

ER-600VC, ER-5KV, or

ER-5WP:

Range⁽⁵⁾.........................250 to 750-Ω change

200 Ω

Default..........................500-Ω change

ER-15KV to ER-35KV:

Range⁽⁵⁾.........................1.25 to 3.75-kΩ change

1 kΩ

Default..........................2.5-kΩ change

Neutral-To-Ground DC-Voltage Rejection:

ER-600VC, ER-5KV, or

ER-5WP....................................25 Vdc

ER-15KV to ER-35KV................125 Vdc

Trip Time..........................................12 to 60 s 1 s

Trip Hold-Off Level ..........................5% of CT-primary rating

Trip Mode ......................................Latching/non-latching

1-A and 5-A Inputs:

Continuous...............................2 x CT rating

1-Second..................................20 x CT rating

EFCT Input:

Continuous...............................10 x CT rating

1-Second..................................25 x CT rating

Measurement Range ......................25 x CT-primary pating

Trip Mode........................................Latching/non-latching

Pulsing Circuit:

Pulse Period ....................................1.0 to 3.0 s,

0.2-s increments

Page 30

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

Duty Cycle .......................................50%

Time Accuracy.................................10% of setting

Trip/Pulsing Relay K1 Contacts:

Range..............................................4 to 22 mA

Loop Voltage...................................8 to 36 Vdc

Load ................................................500 Ω (max with

24-Vdc supply)

Isolation..........................................120 Vac

Parameter .......................................NGR current, 20 mA =

CT primary current

Conﬁguration.................................. N.O. (Form A)

Operating Mode............................. Fail-safe or non-fail-safe

CSA/UL Contact Ratings................ 8 A resistive 250 Vac, 5 A

resistive 30 Vdc

Supplemental Contact Ratings:

Make/Carry 0.2 s.................... 30 A

Break:

USB Communications:

Baud Rate .......................................12 Mbit/s

Protocol...........................................USB Device

Connector .......................................Mini-B

dc....................................... 75 W resistive

35 W inductive

(L/R = 0.004 s)

ac....................................... 2,000 VA resistive

1,500 VA inductive

SD Memory Card:

Type.................................................Standard grade

Form Factor.....................................microSD⁽³⁾and

microSDHC⁽³⁾

(PF = 0.4)

Subject to maxima of 8 A at 250 Vac, 8 A resistive

at 30 Vdc, and 0.4 A resistive at 150 Vdc.

Format.............................................FAT32

Capacity:

SE-330 Hardware

Revision 16 and higher........... 512 MB to 32 GB

SE-330 Hardware

Revision 15 and lower............ 512 MB to 4 GB

GF (K2) and RF (K3) Relay Contacts:

Conﬁguration ..................................N.O. and N.C. (Form C)

Operating Mode (5).........................Non-fail-safe or fail-safe

CSA/UL Contact Ratings.................8 A resistive 250 Vac

8 A resistive 30 Vdc

Operating Temperature:

Standard Grade

Supplemental Contact Ratings:

Make/Carry 0.2 s.................... 30 A

Break:

(Included)................................ -25 to 85°C (-13 to 140°F)

Industrial Grade...................... -40 to 85°C (-40 to 140°F)

Real-Time Clock:

dc....................................... 75 W resistive

35 W inductive

Power-Off Operation...................... approx. 6 months at 20°C (68°F)

Battery included only in hardware revision 10 and higher.

(L/R = 0.004 s)

ac....................................... 2,000 VA resistive

1,500 VA inductive

Terminal-Block Ratings .......................... 10 A, 300 Vac, 12 AWG

(2.5 mm²)

(PF = 0.4)

Subject to maxima of 8 A at 250 Vac, 8 A resistive

at 30 Vdc, and 0.4 A resistive at 150 Vdc.

PWB Conformal Coating ........................ MIL-1-46058 qualiﬁed,

UL QMJU2 recognized

Mounting Conﬁgurations ....................... Panel mount and optional

Surface mount

Unit Healthy Output K4 (Option 0):

Conﬁguration ..................................N.O. (Form A)

Operating Mode..............................Closed when healthy

Ratings............................................100 mA, 250 V (ac or dc)

Closed Resistance ..........................30 to 50 Ω

Dimensions:

Height............................................. 213 mm (8.4 in.)

Width ............................................. 99 mm (3.9 in.)

Depth.............................................. 132 mm (5.2 in.)

Unit Healthy Output K4 (Option 1):

Conﬁguration ..................................N.C. (Form B)

Operating Mode .............................Open when healthy

Ratings............................................100 mA, 250 V (ac or dc)

Closed Resistance ..........................25 to 50 Ω

Shipping Weight .................................... 2.0 kg (4.4 lb)

Environment:

Operating Temperature.................. -40 to 60°C (-40 to 140°F)

Storage Temperature ..................... -55 to 80°C (-67 to 176°F)

Humidity ........................................ 85% Non-condensing

IP Rating......................................... IP30

Auto-reset time.......................................2.8 s max

4-20-mA Analog Output:

Surge Withstand.....................................ANSI/IEEE C37.90.1-1989

(Oscillatory and fast transient)

Type.................................................Self-powered and

Loop-powered

Page 31

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

Voltage Interruption....................... IEC 61000-4-11,

EMC Tests:

Veriﬁcation tested in accordance with IEC 60255-26:2013.

IEC 61000-4-29

0% for 10, 20, 30,

50 ms (dc)

Radiated and Conducted

0% for 0.5, 1, 2.5,

5 cycles (60 Hz)

Emissions ....................................... CISPR 11:2009,

CISPR 22:2008,

IEC 61000-4-17

Level 4, 15% of the rated dc

value

EN 55022:2010 Class A

Current Harmonics and

Voltage Fluctuations ...................... IEC 61000-3-2 and

Certiﬁcation............................................ CSA, Canada and United States

IEC 61000-3-3

Class A

LR 53428

C

US

Electrostatic Discharge.................. IEC 61000-4-2

UL Listed

6 kV contact discharge

(direct and indirect)

8 kV air discharge

Australia

Radiated RF Immunity.................... IEC 61000-4-3

10 V/m, 80-1,000 MHz,

80% AM (1 kHz)

10 V/m, 1.0 to 2.7 GHz,

80% AM (1 kHz)

CE, European Union

FCC

Fast Transient................................. IEC 61000-4-4

Zone B

2 kV (power supply

port), 1 kV (all other

ports)

Surge Immunity.............................. IEC 61000-4-5

Zone B

1 kV differential mode

2 kV common mode

To: CSA C22.2 No. 14 Industrial Control Equipment

UL 508 Industrial Control Equipment

UL 1053 Ground Fault Sensing and Relaying

Equipment

Australia, Regulatory Compliance Mark (RCM)

CE Low Voltage Directive

IEC 61010-1:2010 (3rd Edition) + AMD 1:2016

FCC CFR47, Part 15, Subpart B,

Class A – Unintentional Radiators

Conducted RF Immunity ................. IEC 61000-4-6

10 V, 0.15-80 MHz,

80% AM (1 kHz)

Compliance............................................. RoHS Compliant

Magnetic Field

Immunity ........................................ IEC 61000-4-8

50 Hz and 60 Hz

NOTES:

(1)

See sensing resistor speciﬁcations for applicable voltage limits.

(2)

30 A/m and 300 A/m

Accuracy included for EFCT-x, SE-CS30-x, ELCT5-x, and ELCT30-x

current sensors only.

microSD and microSDHC are trademarks of SD-3C, LLC.

Remote-reset and pulse-enable wiring is limited to 10 m (32 ft).

This value can only be modiﬁed using SE-MON330 software. See

Power Frequency⁽⁴⁾......................... IEC 61000-4-16

Zone A: differential mode

100 Vrms

(3)

(4)

(5)

Zone A: common mode

300 Vrms

Section 4.2.

6.2 Sensing Resistors

1 MHz Burst ................................... IEC 61000-4-18

1 kV differential mode

Environment:

Operating Temperature.................. -40 to 60°C (-40 to 140°F)

Storage Temperature ..................... -55 to 80°C (-67 to 176°F)

Extended Operating

(line-to-line)

2.5 kV common mode

Temperature................................... -55 to 60°C (-67 to

140°F)⁽¹⁾

Page 32

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

ER-600VC:

Maximum Voltage.......................... 600 Vac

ER-35KV:

Maximum Voltage.......................... 22,000 Vac

Maximum Current .......................... 30 mA

Resistance...................................... 20 kΩ

Thermal:

Maximum Current .......................... 220 mA

Resistance ..................................... 100 kΩ

Thermal:

420 Vac...................................... Continuous

600 Vac...................................... 6 minutes on,

60 minutes off

22,000 Vac.............................. 1 minute on,

120 minutes off

3,000 Vac................................ Continuous

Torque (Terminal N) ....................... 9.0 N•m (80 lbf•in.)

Shipping Weight ............................ 40 kg (88 lb)

Shipping Weight ............................ 300 g (0.7 lb)

ER-5KV:

Maximum Voltage.......................... 2,500 Vac

Maximum Current .......................... 125 mA

Resistance...................................... 20 kΩ

Thermal .......................................... Continuous

Torque:

Certiﬁcation ........................................... CSA, Canada and United States

LR 53428

C

US

UL Listed

Terminal N:

10-32 Insert ....................... 5.6 N•m (50 lbf•in.)

Others................................ 9.0 N•m (80 lbf•in.)

Shipping Weigh.............................. 5.0 kg (11 lb)

Australia

ER-5WP:

CE, European Union

Maximum Voltage.......................... 2,500 Vac

Maximum Current .......................... 125 mA

Resistance...................................... 20 kΩ

Thermal .......................................... Continuous

Torque:

NOTES:

(1)

Electrical speciﬁcations have been veriﬁed at a Littelfuse lab.

Terminal N:

6.3 Current Sensors

10-32 Insert ....................... 5.6 N•m (50 lbf•in.)

Others................................ 9.0 N•m (80 lbf•in.)

Shipping Weight ............................ 5.0 kg (11 lb)

Environment:

Operating Temperature.................. -40 to 60°C (-40 to

140°F)

Storage Temperature ..................... -55 to 80°C (-67 to

176°F)

Compliance .................................... RoHS,

IEC 61869-2

ER-15KV:

Maximum Voltage.......................... 8,400 Vac

Maximum Current .......................... 84 mA

Resistance...................................... 100 kΩ

Thermal:

ANSI/IEEE C57.13

EFCT-1:

8,400 Vac................................ 1 minute on,

120 minutes off

Current Ratio.................................. 5:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 82 mm (3.2”)

Shipping Weight ............................ 0.9 kg (2.0 lb)

Certiﬁcations.................................. CSA, UL, CE

Compliance .................................... RoHS, IEC 60044-1

Extended Operating

1,900 Vac................................ Continuous

Torque (Terminal N)........................ 9.0 N•m (80 lbf•in.)

Shipping Weight ............................ 5.0 kg (11 lb)

ER-25KV:

Maximum Voltage.......................... 14,400 Vac

Maximum Current .......................... 144 mA

Resistance ..................................... 100 kΩ

Thermal:

Temperature................................... -55 to 60°C (-67 to

140°F)⁽¹⁾

Supplemental

Speciﬁcations:

14,400 Vac.............................. 1 minute on,

120 minutes off

Trip Level Accuracy:

≤ 1 A ............................ 1% of CT-Primary Rating

> 1 A ............................ 3% of CT-Primary Rating

2,500 Vac................................ Continuous

Torque (Terminal N)........................ 9.0 N•m (80 lbf•in.)

Shipping Weight ............................ 20 kg (44 lb)

Page 33

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

EFCT-26:

Current Ratio.................................. 5:0.05 A

Extended Operating

Temperature................................... -55 to 60°C (-67 to

140°F) ⁽¹⁾

Insulation ....................................... 600-V Class

Window Diameter.......................... 26 mm (1.0”)

Shipping Weight ............................ 0.45 kg (1.0 lb)

Certiﬁcations.................................. CSA, UL, CE

Compliance .................................... RoHS, IEC 60044-1

Extended Operating

SE-CS30-26:

Current Ratio.................................. 30:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 26 mm (1.0”)

Shipping Weight ............................ 0.45 kg (1.0 lb)

Certiﬁcations.................................. CSA, UL, CE

Compliance .................................... RoHS, IEC 60044-1

Extended Operating

Temperature .................................. -55 to 60°C (-67 to

140°F)⁽¹⁾

Supplemental

Speciﬁcations:

Trip Level Accuracy:

Temperature................................... -55 to 60°C (-67 to

140°F)⁽¹⁾

≤ 1 A..........................1% of CT-Primary Rating

> 1 A..........................3% of CT-Primary Rating

SE-CS30-70:

Current Ratio.................................. 30:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 70 mm (2.7”)

Shipping Weight ............................ 1.2 kg (2.5 lb)

Certiﬁcations.................................. CSA, UL, CE

Compliance .................................... RoHS, IEC 60044-1

Extended Operating

ELCT30-31:

Current Ratio.................................. 30:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 31 mm (1.22 in.)

Shipping Weight ............................ 0.45 kg (1 lb)

Certiﬁcations.................................. cUL, CE

Temperature................................... -55 to 60°C (-67 to

ELCT30-88:

140°F)⁽¹⁾

Current Ratio.................................. 30:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 88 mm (3.46 in.)

Shipping Weight ............................ 0.91 kg (2 lb)

Certiﬁcations.................................. cUL, CE

(1)

Electrical speciﬁcations have been veriﬁed at a Littelfuse

lab.

ELCT5-31:

Current Ratio.................................. 5:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 31 mm (1.22 in.)

Shipping Weight ............................ 0.45 kg (1 lb)

Certiﬁcations.................................. cUL, CE

ELCT5-88:

Current Ratio.................................. 5:0.05 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 88 mm (3.46 in.)

Shipping Weight ............................ 0.91 kg (2 lb)

Certiﬁcations.................................. cUL, CE

CT200:

Current Ratio.................................. 200:5 A

Insulation ....................................... 600-V Class

Window Diameter.......................... 56 mm (2.2 in.)

Shipping Weight ............................ 1 kg (2.2 lb)

Certiﬁcations.................................. CSA, UL

Compliance .................................... RoHS

Page 34

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

CT200 ............................................. Current sensor,

7. ORDERING INFORMATION

200-A-primary rating,

56-mm (2.2 in.) window

-

SE-330-

5SHT-101-E..................................... Current sensor,

K4 Contact:

0 N.O. UNIT HEALTHY Contact

1 N.C. UNIT HEALTHY Contact

100-A-primary rating,

40-mm (1.6 in.) window

5SHT-151-E..................................... Current sensor,

150-A-primary rating,

40-mm (1.6 in.) window

5SHT-500-E..................................... Current sensor,

50-A-primary rating,

40-mm (1.6 in.) window

7SHT-301-E..................................... Current sensor,

300-A-primary rating,

64-mm (2.5 in.) window

7SHT-401-E..................................... Current sensor,

Options:

0 No Options

Network Communications:⁽¹⁾

0 None

1 DeviceNet™

3 Ethernet (Dual RJ45)⁽²⁾

4 Ethernet (SC ﬁber & RJ45)⁽²⁾

5 Ethernet (Dual SC ﬁber)⁽²⁾

6 IEC 61850 (Dual RJ45)

7 IEC 61850 (SC ﬁber & RJ45)

8 IEC 61850 (Dual SC ﬁber)

Supply:

400-A-primary rating,

64-mm (2.5 in.) window

0 Universal ac/dc supply

2 48 Vdc supply

Accessories:

RK-332............................................ Remote indication and reset,

includes two 120-V pilot

lights, a reset push button,

and legend plates

SE-IP65CVR-G ................................ Hinged transparent cover,

IP65

NOTE: Please refer to the SE-330 Product Change Notice (PCN)

document for updated ordering information and new revision

details, available at www.littelfuse.com/se-330.

SE-MRE-600................................... Moisture-resistant

enclosure for ER-600VC

PGA-0520 ....................................... Percent analog meter

SE-330-SMA .................................. Surface mount adapter

AC300-MEM-00 ............................. Industrial-grade

microSD card

NOTE: The SE-330-SMA surface mount adapter is available as an

accessory only.

Sensing Resistors:

ER-600VC ....................................... For system voltages up to

1 kVac

Software:⁽⁴⁾

ER-5KV ........................................... For system voltages up to

5 kVac

ER-5WP .......................................... For system voltages up to

5 kVac, weather protected

ER-15KV ......................................... For system voltages up to

15 kVac

ER-25KV ........................................ For system voltages up to

25 kVac

ER-35KV ......................................... For system voltages up to

35 kVac

SE-MON330 Software ................... SE-330 Data-display

Program for PC, version

4.0 or higher

NGR Monitor

Set-Point Assistant ........................ SE-330 settings guide

NOTES:

(1)

(2)

(3)

(4)

Proﬁbus models only available on legacy SE-330.

Includes Modbus TCP and EtherNet/IP protocols.

Includes IEC 61850 protocol only.

Current Sensors:

Available at www.littelfuse.com/relayscontrols.

ELCT5-31 ........................................ Current sensor, 31-mm

(1.22 in.) window

ELCT5-88 ........................................ Current sensor, 88-mm

(3.46 in.) window

ELCT30-3 ........................................ Current sensor, 31-mm

(1.22 in.) window

ELCT30-88 ...................................... Current sensor, 88-mm

(3.46 in.) window

Page 35

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

NOTE: Resistor-fault-trip reset can take up to one second.

8. WARRANTY

The SE-330 Neutral-Grounding-Resistor Monitor is warranted to

be free from defects in material and workmanship for a period of

ﬁve years from the date of purchase.

9.1.2 Voltage Test

Test Equipment: 0 to 120 Vac voltage source, multimeter, and ER

sensing resistor.

Littelfuse will (at the choice of Littelfuse) repair, replace, or

refund the original purchase price of an SE-330 that is determined

by Littelfuse to be defective if it is returned to Littelfuse, freight

prepaid, within the warranty period. This warranty does not apply

to repairs required as a result of misuse, negligence, an accident,

improper installation, tampering, or insufﬁcient care. Littelfuse

does not warrant products repaired or modiﬁed by non-Littelfuse

personnel.

NOTE: Use an isolation transformer if the test-voltage source

does not provide dc continuity for the SE-330 resistance-measuring

circuit.

NOTE: Applying the test voltage to the R and G terminals will

damage the SE-330 and the ER sensing resistor. The V_NTRIP LEVEL

is the trip voltage at terminal N, not terminal R.

9. TEST PROCEDURES

Procedure:

NOTE: Ensure the real-time clock is set. See Section 4.2.

•

Connect the ER sensing resistor to the SE-330 and calibrate

the SE-330.

9.1 Resistor-Fault Tests

Disconnect the wire from sensing-resistor terminal N. A

resistor-fault trip will occur.

Perform tests with system de-energized and supply voltage

applied to the SE-330.

•

Set the voltage source to 0 V.

Connect the voltage source between sensing resistor N and

G terminals.

9.1.1 Calibration and Open Test

Test Equipment: 20-kΩ and 100-kΩ, ¼-watt, 1%

calibration resistors (calibration resistors

are supplied with SE-330).

•

Set the V_NTRIP LEVEL (VAC) to 20.

Press RESET.

Procedure:

The RESISTOR FAULT TRIP LED should be off.

•

Remove connections to terminals 6 and 7.

Connect the 20-kΩ resistor to terminals 6 and 7.

Set switch S5 to the 20-kΩ position.

Perform calibration as per Section 2.2.

The CALIBRATED LED should be on.

Press RESET.

Increase the test voltage to 25 Vac for 20-kΩ sensors or 120

Vac for 100-kΩ sensors and wait for the resistor-fault trip

time.

PASS: The SE-330 should trip on RESISTOR FAULT. A time

delayed ground-fault trip follows the resistor-fault trip if

neutral voltage persists after the resistor fault. For legacy

units with ﬁrmware revision 6 or less, this does not apply.

9.2 Sensing-Resistor Test

Test Equipment: Multimeter

Procedure:

Remove the 20-kΩ resistor and wait for the resistor-fault trip

time.

PASS: The SE-330 should trip on resistor fault.

Connect the 100-kΩ resistor to terminals 6 and 7.

Set switch S5 to the 100-kΩ position.

Perform calibration as per Section 2.2.

The CALIBRATED LED should be on.

Press RESET.

•

Disconnect the sensing resistor.

Measure the resistance between sensing-resistor terminals R

and N.

PASS: Resistance should be between 19.6 and 20.4 kΩ for

20-kΩ sensing resistors. Resistance should be between 98

and 102 kΩ for 100-kΩ sensing resistors.

Remove the 100-kΩ resistor and wait for the resistor-fault trip

time.

•

Measure the resistance between sensing-resistor terminals R

and G in both directions.

PASS: The SE-330 should trip on resistor fault.

PASS: Resistance should be greater than 10 MΩ in both

directions.

Page 36

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

NOTE: Do not inject test current directly into CT-input terminals 8,

9, 10, and 11.

9.3 Analog-Output Test

Test Equipment: multimeter with an mAdc scale.

Procedure:

NOTE: For accurate trip-time measurement, the fault current should

not be re-applied for the time deﬁned by the GF TRIP TIME setting to

allow the trip accumulator to initialize.

•

Connect the 4-20-mA output as a self-powered output (see Fig.

3). Measure the current from terminal 20 to terminal 21.

PASS: With no CT current, the analog output should be 4

mA.

•

Output is linear to 20 mA. output is 20 mA when CT-primary

current is equal to the CT-primary rating.

9.4 Ground-Fault Performance Test

To meet the requirements of the National Electrical Code*, the

overall ground-fault protection system requires a performance

test when ﬁrst installed (as applicable). A written record of the

performance test must be retained by those in charge of the

electrical installation in order to make it available to the authority

having jurisdiction. A test-record form is included for recording the

date and the ﬁnal results of the performance tests. The following

ground-fault system tests are to be conducted by qualiﬁed

personnel:

•

Evaluate the interconnected system in accordance with the

overall equipment manufacturer’s detailed instructions.

•

Verify proper installation of the ground-fault current sensor.

Ensure the cables pass through the ground-fault-current-

sensor window. This check can be visually conducted with

knowledge of the circuit. The connection of the current-sensor

secondary to the SE-330 is not polarity sensitive.

•

Verify that the system is correctly grounded and that alternate

ground paths do not exist that bypass the current sensor.

High-voltage testers and resistance bridges can be used to

determine the existence of alternate ground paths.

FIG. 22. Ground-fault-test circuits.

TABLE 3. Ground-fault-test record

DATE

TEST RESULTS

Verify proper reaction of the circuit-interrupting device in

response to a simulated or controlled ground-fault current. To

simulate ground-fault current, use CT-primary current injection

(does not apply for bushing-type CTs). Fig. 22a shows a test

circuit using an SE-400 Ground-Fault-Relay test unit. The SE-

400 has a programmable output of 0.5 to 9.9 A for a duration

of 0.1 to 9.9 seconds. Set the test current to 120% of GF TRIP

LEVEL. Fig. 22b shows a test circuit using an SE-100T Ground-

Fault-Relay Tester. The SE-100T provides a test current of 0.65

or 2.75 A for testing 0.5- and 2.0-A trip levels. Inject the test

current through the current-sensor window for at least 2.5

seconds. Verify that the circuit under test has reacted properly.

Correct any problems and re-test until the proper reaction is

veriﬁed.

Record the results and date of each test on the attached test-

record form.

Retain this record for the authority having jurisdiction.

Page 37

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

APPENDIX A

SE-330 REVISION HISTORY

MANUAL RELEASE

DATE

PRODUCT REVISION

(REVISION NUMBER ON PRODUCT LABEL)

MANUAL REVISION

FIRMWARE VERSION

3.00

2.60

2.55

2.54

2.53

June 30, 2018

11-A-063018

17A

17

October 18, 2017

December 7, 2016

10-P-101817

10-N-120716

September 21, 2016

10-M-092116

16

June 30, 2016

September 8, 2015

June 22, 2015

May 20, 2015

10-L-063016

10-K-090815

10-J-062215

10-I-052015

10-H-030315

2.52

2.50

2.40

15

14

March 3, 2015

2.31

2.30

July 7, 2014

10-G-070714

10-F-041414

April 14, 2014

13

12

11

2.20

January 8, 2014

10-E-010814

November 29, 2013

October 8, 2013

September 12, 2013

August 30, 2013

10-D-112913

10-C-100813

10-B-091213

10-A-083013

2.10

2.08

2.07

10A

10

MANUAL REVISION HISTORY

REVISION 11-A-063018

GENERAL

Manual format and many sections have been updated.

SECTION 1

Descriptions for NGR short detection and assignable relays added.

SECTION 2

Enhanced health status added.

SECTION 6

NGR short detection speciﬁcations added.

REVISION 10-P-101817

SECTION 2

New features described in Section 2.8.

SECTION 3

Installation instruction updated.

SECTION 4

SD Card note added.

SECTION 5

Troubleshooting information added.

SECTION 7

Ordering information updated.

REVISION 10-N-120716

APPENDIX A

Revision history updated.

Page 38

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

REVISION 10-M-092116

SECTION 4

Firmware upgrade instructions updated.

APPENDIX A

Revision history updated.

REVISION 10-L-063016

SECTION 4

Section 4.1.2 updated.

SECTION 6

microSDstorage capacity increased to 32 GB.

RCM certiﬁcation added.

REVISION 10-K-090815

SECTION 4

Section 4.1.2 updated.

SECTION 5

SD card diagnostic troubleshooting updated.

REVISION 10-J-062215

SECTION 2

Section 2.1.7 added.

SECTION 4

SD card approximate annual data logging usage updated.

SE-MON330 software version updated.

SECTION 6

Resistor-fault trip level ranges added.

REVISION 10-I-030315

SECTION 4

SD card storage capacity updated.

SECTION 6

SD card storage capacity speciﬁcation updated.

REVISION 10-H-030315

SECTION 2

Sections 2.1.6 and 2.1.7 added.

SECTION 4

Section 4.2 new features added.

SECTION 6

Resistor-fault circuit trip time update

REVISION 10-G-070714

SECTION 6

Added CE, C-Tick, and FCC information.

REVISION 10-F-041414

APPENDIX A

Hardware revision updated.

REVISION 10-E-010814

SECTION 6

Extended operating temperatures added to all sensing resistors and SE-CS30 current sensors.

REVISION 10-D-112913

SECTION 6

CE added to sensing resistors.

SECTION 7

Ordering information updated.

REVISION 10-C-100813

SECTION 2

Section 2.8 updated.

SECTION 4

Real-time clock note added in Section 4.2.

Page 39

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

SECTION 5

LED and relay status added to troubleshooting solutions.

SECTION 7

Ordering information updated.

REVISION 10-B-091213

APPENDIX A

Hardware revision updated.

REVISION 10-A-083013

SECTION 1

Faceplate updated.

New features added.

SECTION 2

Communications options updated.

Conﬁguration switches updated.

Indication relays explanation added.

Non-volatile-memory error added.

SECTION 3

Connection drawing updated.

SECTION 4

Section heading changed to Data Interfaces.

Updated with microSD and USB interfaces.

Upgrade procedure added.

SECTION 5

Non-volatile-memory error added.

Switch S8 diagnostic LED error removed.

SECTION 6

Ground-fault circuit trip level updated.

USB communications speciﬁcations added.

Resistor-fault accuracy changed.

microSD memory card speciﬁcations added.

SECTION 7

Ordering information updated.

SE-330-SMA surface mount adapter listed as an accessory only.

APPENDIX A

Added revision history.

HARDWARE REVISION HISTORY

HARDWARE REVISION 17A

Additional EMC ﬁlter capacitors added.

HARDWARE REVISION 17

Enhanced transient protection added.

HARDWARE REVISION 16

microSD storage capacity increased to 32 GB.

HARDWARE REVISION 15

RTC circuit updated.

HARDWARE REVISION 14

CE and C-Tick compliance added.

HARDWARE REVISION 13

ESD sensitivity of front-panel dials reduced

HARDWARE REVISION 12

Fiber ethernet support improved.

HARDWARE REVISION 11

ESD sensitivity of USB and SD card connectors reduced.

HARDWARE REVISION 10A

RTC circuit updated.

Page 40

SE-330 Neutral-Grounding-Resistor Monitor

Rev. 11-A-063018

HARDWARE REVISION 10

SE-330 platform updated to include USB and microSD interfaces, programmable trip level (MEM) feature, and ability to add

future options.

Real-time clock and rechargeable battery added.

Dual cable and ﬁber Ethernet ports added.

FIRMWARE REVISION HISTORY

FIRMWARE REVISION 3.00

NGR short detection functionality added.

Assignable functions for K1, K2, and K3 added.

Standard and non-accumulating selections added to ground-fault trip time algorithm.

UTC Offset added to SNTP Client functionality.

SD card logging limited to two most recent months of data.

FIRMWARE REVISION 2.60

Option to display only critical diagnostic codes with DIAGNOSTIC LED added.

FIRMWARE REVISION 2.55

IEC 61850 network watchdog resets corrected.

FIRMWARE REVISION 2.54

NAND FLASH bit-error-correction update to prevent solid-red diagnostic LED error when bit errors are correctable.

Resistor-fault trip level added to web interface.

MODBUS TCP/IP write response byte count corrected.

TCP Keep Alive network setting no longer resets to 5 s after power cycle.

FIRMWARE REVISION 2.53

NAND FLASH bit error correction code to prevent solid-red diagnostic error ﬁxed.

FIRMWARE REVISION 2.52

Improved compatibility with Internet Explorer* web browser.

FIRMWARE REVISION 2.50

Support for adjustable resistor-fault trip level added.

Web page functionality re-enabled for Ethernet options.

FIRMWARE REVISION 2.40

Support for geo-magnetic ﬁlter added.

Support for 12 to 60 s resistor-fault trip time added.

Improved log ﬁle descriptions.

IEC 61850 GOOSE network input support now always enabled.

Improved compatibility for Modbus TCP.

Web page disabled for Ethernet options. This will be enabled in a future ﬁrmware release.

IP setting changes for Ethernet options now require power cycle to take effect.

FIRMWARE REVISION 2.31

SD card and USB diagnostic events no longer cause a trip.

FIRMWARE REVISION 2.30

Remote calibration feature added.

FIRMWARE REVISION 2.20

Added support for Ethernet/IP protocol.

IED name now reported correctly through IEC 61850 interface.

Ethernet/IP and Modbus communications card LED status updated.

Hardware version viewable in the SE-MON330 software and through the MODBUS and IEC 61850 servers.

FIRMWARE REVISION 2.10

Added support for IEC 61850 and DeviceNet protocols.

FIRMWARE REVISION 2.08

Added support for communications options.

FIRMWARE REVISION 2.07

Updated ﬁrmware to include USB and microSD interfaces, datalogging, and ﬁrmware update via microSD.

K2 and K3 indication relays can be conﬁgured for fail-safe or non-fail-safe operation.

Trip records increased to 100 with date and time stamping.

* Bluetooth, Internet Explorer, National Electric Code, and microSD are trademarks of their respective owners.


型号：	SE-330-20-11
厂家：	LITTELFUSE
描述：	NGR MONITOR 48VDC NC CE/C-T 监视器
文件：	总44页 (文件大小：2152K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SE-330-20-11 [LITTELFUSE]

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