Littelfuse SE-330 Manuale utente

Tel: +1-800-832-3873

E-mail: relays@littelfuse.com

www.littelfuse.com/SE-330

Document Number: PM-1200-EN

MANUAL FOR

SE-330 NEUTRAL-GROUNDING-RESISTOR MONITOR

SE-330HV NEUTRAL-GROUNDING-RESISTOR MONITOR

SE-330AU NEUTRAL-EARTHING-RESISTOR MONITOR

REVISION 11-B-121520

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

Table of Contents

1. General ......................................................................1

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

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

1.3 NGR Sensitive Open and Short Detection ..........3

2. Operation ..................................................................3

2.1 Settings ................................................................3

2.1.1 GF Trip Time.....................................................3

2.1.2 GF Trip Level ....................................................3

2.1.3 VN Trip Level ....................................................3

2.1.4 Pulse Period Adjustment (SE-330 only) ...........8

2.1.5 Configuration Settings ......................................8

2.1.5.1 Relay K1 Function (S1, SE-330 ONLY).........8

2.1.5.2 Trip-Relay Mode and Trip-Memory Mode (S2,

SE-330 AND SE-330HV ONLY) .................................8

2.1.5.3 Ground-Fault-Trip Latch (S3).........................9

2.1.5.4 Resistor-Fault-Trip Latch (S4) .......................9

2.1.5.5 Sensing-Resistor Selection (S5)....................9

2.1.5.6 Frequency (S6) ..............................................9

2.1.5.7 Upgrade Mode (S8) .......................................9

2.1.6 Resistor-Fault Trip Time ...................................9

2.1.7 Resistor-Fault Trip Level...................................9

2.1.8 Geo-Magnetic Filter ..........................................9

2.2 Calibration............................................................9

2.3 Pulsing Operation (SE-330 only) .......................10

2.4 Trip Indication and Reset...................................10

2.5 Remote Operation .............................................11

2.6 Relay K1 LED ....................................................11

2.7 Unit Healthy Output ...........................................11

2.8 Diagnostic LED ..................................................11

2.9 Enhanced Health Status .....................................11

2.10 Analog Output ..................................................11

3. Installation ..............................................................12

3.1 SE-330 Series....................................................12

3.2 Sensing Resistor................................................20

3.3 Ground-Fault CT ................................................32

3.4 Isolated Ground Connection ..............................39

3.5 Pulsing Connection (SE-330 only).....................39

4. Data Interfaces .......................................................40

4.1 SD Card .............................................................40

4.1.1 Datalogging.....................................................40

4.1.2 Firmware Upgrade ..........................................40

4.2 USB Interface.....................................................40

4.3 Network Communications..................................41

5. Troubleshooting.....................................................42

6. Technical Specifications .......................................44

6.1 SE-330 Series (unless otherwise stated) ..........44

6.2 SENSING RESISTORS.....................................49

6.3 Current Sensors ................................................ 50

7. Ordering Information............................................. 52

8. Warranty ................................................................. 55

9. Test procedures ..................................................... 55

9.1 Resistor-Fault Tests.......................................... 55

9.1.1 Calibration, Open and Short Tests ................ 55

9.1.2 Voltage Test (SE-330 and SE-330AU only) .. 56

9.1.3 Voltage Test (SE-330HV only)....................... 57

9.2 Sensing-Resistor Test....................................... 57

9.3 Analog-Output Test........................................... 57

9.4 Ground-Fault Performance Test ....................... 57

Appendix A SE-MON330 Reference .......................... 59

A1. General ............................................................. 59

A2. Setup ................................................................. 59

A2.1 Initial Configuration Tab .................................. 60

A2.2 Summary Tab.................................................. 60

A2.3 Detailed Status Tab ........................................ 64

A2.4 Configuration tab............................................. 64

A2.4.1 Resistor fault ................................................ 64

A2.4.2 Ground Fault ................................................ 64

A2.4.3 Configuration................................................ 65

A2.4.4 Networking ................................................... 65

A2.4.5 SNTP Client ................................................. 65

A2.5 Event Records Tab ......................................... 66

A2.6 System Menu .................................................. 68

A2.6.1 Earth-Fault CT.............................................. 68

A2.6.2 Voltage Setting............................................. 68

A2.6.3 Set Date/Time .............................................. 68

A2.6.4 Reset to Defaults ......................................... 68

A2.6.5 Remote Calibration ...................................... 68

A2.7 Using Set-Point Assistant ............................... 70

Appendix B - SE-330, SE-330HV, SE-330AU Revision

History.......................................................................... 71

Manual Revision History ............................................ 74

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

List of Figures

FIGURE 1. SE-330 Configuration Switches.............. 8

FIGURE 2. SE-330HV Configuration Switches......... 8

FIGURE 3. SE-330AU Configuration Switches......... 8

FIGURE 4. Analog-Output Connections. ................ 11

FIGURE 5. SE-330 Connection Diagram................ 13

FIGURE 6. SE-330HV Connection Diagram........... 14

FIGURE 7. SE-330AU Connection Diagram........... 15

FIGURE 8. SE-330 Outline and Panel-Mounting

Details............................................................... 16

FIGURE 9. SE-330 Outline and Surface-Mounting

Details............................................................... 17

FIGURE 10. SE-IP65CVR-G Weatherproof Cover

Outline .............................................................. 18

FIGURE 11. SE-IP65CVR-G Weatherproof Cover

Installation ........................................................ 19

FIGURE 12. ER-600VC Sensing Resistor. ............. 21

FIGURE 13. SE-MRE-600 Moisture-Resistant

Enclosure Outline............................................. 22

FIGURE 14. ER-600VC Installed in SE-MRE-600.. 23

FIGURE 15. ER-5KV Sensing Resistor. ................. 24

FIGURE 16. ER-5WP Sensing Resistor ................. 25

FIGURE 17. ER-15KV Sensing Resistor. ............... 26

FIGURE 18. ER-25KV Sensing Resistor. ............... 27

FIGURE 19. ER-35KV Sensing Resistor. ............... 28

FIGURE 20. ER-72KV Sensing Resistor Outline.... 29

FIGURE 21. ER-72KV Sensing Resistor Mounting

Details............................................................... 30

FIGURE 22. ER-1000HV Sensing Resistor. ........... 31

FIGURE 23. ER-1000HV Simplified Connection

Diagram............................................................ 32

FIGURE 24. ELCT5-88 and ELCT30-88 Ground-

Fault Current Sensors ...................................... 33

FIGURE 25. ELCT5-31 and ELCT30-31 Ground-

Fault Current Sensors...................................... 34

FIGURE 26. EFCT-1 Ground-Fault Current Sensor.

.......................................................................... 35

FIGURE 27. SE-CS30-70 Ground-Fault Current

Sensor .............................................................. 36

FIGURE 28. EFCT-26 and SE-CS30-26 Ground-

Fault Current Sensors ...................................... 37

FIGURE 29. RK-332 Remote Indication and Reset.38

FIGURE 30. PGA-0520 Analog Percent Current

Meter. ............................................................... 38

FIGURE 31. Simplified Isolated-Ground Connection.

.......................................................................... 39

FIGURE 32. Simplified Pulsing Connection............ 39

FIGURE 33. Ground-Fault-Test Circuits. ................ 58

FIGURE 34. Communication Tab............................ 61

FIGURE 35. Initial Configuration Tab...................... 61

FIGURE 36. Summary Tab ..................................... 62

FIGURE 37. Detailed Status Tab. ........................... 62

FIGURE 38. Configuration Tab ............................... 63

FIGURE 39. Event Records Tab............................. 67

FIGURE 40. System Parameters Menu .................. 69

FIGURE 41. Set-Point Assistant. ............................ 70

List of Tables

Table 1. Typical Values for Tripping Systems (SE-330

and SE-330HV) .................................................. 5

Table 2. Typical Values for Tripping Systems (SE-

330AU) ............................................................... 6

Table 3. Ground-Fault Trip Levels for Selected CTs

(SE-330 and SE-330HV).................................... 7

TABLE 4. Ground-Fault-Test Record...................... 59

DISCLAIMER

Specifications are subject to change without notice.

Littelfuse is not liable for contingent or consequential

damages, or for expenses sustained as a result of

incorrect application, incorrect adjustment, or a

malfunction.

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

1. General

This is a combined manual for the following products:

•SE-330 Neutral-Grounding-Resistor Monitor

•SE-330HV Neutral-Grounding-Resistor Monitor

•SE-330AU Neutral-Earthing-Resistor Monitor

The features described in this manual are common to all

monitors unless otherwise indicated. Resistance-

grounded systems require a neutral-grounding resistor

(NGR), also known as a neutral-earthing resistor (NER)

in some regions. Both terms may be shown in this

manual.

The SE-330 and SE-330HV (firmware version 3.01 and

higher) are compliant with the 2018 CE Code.

The SE-330AU (firmware version 3.10 and higher) is

compliant with AS/NZS 2081.6:2011 and AS/NZS

2081.8:2011.

PC software SE-MON330 version 4.1 or higher

is required to configure the SE-330 series. For

more details about SE-MON330, refer to

Appendix A. SE-MON330 can be found at

www.littelfuse.com/relayscontrols.

1.1 Modern Resistance-Grounded Systems

A high-resistance-grounded system uses a neutral-

grounding resistor (NGR) with a low let-through current

to limit 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 a high-resistance-grounded system.

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 up to 10 A are used; however,

they 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 Electrical Code (NEC)* 250.36, and NEC

250.186 for application details (applies to SE-330 and

SE-330HV).

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 can be

conservatively estimated as ½ A per 1,000 kVA on low-

voltage systems and 1 A per 1,000 kVA on medium-

voltage systems.

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

selective coordination, choose 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 with a definite-time characteristic to

achieve time coordination. Use the same pick-up

current for all ground-fault devices, which must be larger

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.

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 rated for line-to-neutral voltage.

•A transformer saturated by a ground fault

through a rectifier can make ground-fault

protection inoperative.

•Transformer inrush current up to 12 times rated

current can cause a ground-fault voltage larger

than expected.

•A parallel transformer winding makes it difficult

to monitor NGR continuity.

•A transformer can provide the inductance

necessary to cause ferroresonance if the NGR

opens.

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.

1.2 SE-330 Series NGR Monitoring

The SE-330 microprocessor-based neutral-grounding-

resistor monitor series detect NGR failures and ground

faults in resistance-grounded systems. The SE-330

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

series measure NGR resistance, NGR current, and

transformer or generator neutral-to-ground voltage. The

components required to monitor an NGR are an SE-330

series monitor, a 20- or 100-kΩER-series sensing

resistor (100- or 200-kΩsensing resistor for the SE-

330HV), and a current transformer (CT).

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 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 VNTRIP LEVEL

setting and if NGR current is less than 5% of the CT

rating, the SE-330 series will trip on resistor fault. If the

resistor-fault circuit is tripped and the neutral voltage

exceeds the VNTRIP LEVEL setting for an interval

greater than the GF TRIP TIME setting, the ground-fault

circuit will also trip.

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

secondary (SE-330 or SE-330HV only), or by one of the

following sensitive CTs:

•ELCT5-x or ELCT30-x for the SE-330 and SE-

330HV

•EFCT-x or SE-CS30-x for the SE-330AU

For the SE-330 and SE-330HV, the trip level of the

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

CT rating and trip time is adjustable from 0.1 to 10.0

seconds.

For the SE-330AU, the trip level of the earth-fault circuit

is adjustable from 0.125 to 5 A for the EFCT-x and 0.75

to 30 A for the SE-CS30-x. Trip time is adjustable from

0.1 to 0.5 seconds. Open-CT detection is provided with

a fixed 2-second time delay.

The SE-330 series has four output relays. With firmware

version 3.00 or higher, relays K1, K2, and K3 (K2 and K3

for the SE-330AU) can be assigned to one of the

following functions (using SE-MON 330):

•Ground Fault (GF);

•Resistor Fault (RF);

•Enhanced Health Status (HEALTH);

•GF + RF;

•GF + RF + HEALTH;

•RF (Short Only);

•RF (Open Only); or

•DISABLED.

For the SE-330 only, regardless of the K1 assignment,

K1 can also be assigned to a pulsing function. This can

control a contactor to assist in locating faults.

For the SE-330 and SE-330HV, 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.

For the SE-330AU, relay K1 is the trip relay and

operates in the fail-safe mode for undervoltage

applications. Relays 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.

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.

The SE-330 series provides these additional features

over the legacy models:

•NGR sensitive short and open detection

capability

•Assignable relay functions (K1, K2, K3 for the

SE-330 and SE-330HV, and K2, K3 for the SE-

330AU)

•When the trip level is set to MEM, the ground-

fault trip setting is defined by an internal non-

volatile memory variable. Range is 2 to 100% in

1% increments of the CT-primary rating.

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

fail-safe.

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

•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. See

Section 4.1.

•For ease of connection to new devices, the RS-

232 interface has been replaced by a Mini B

USB port.

•Dual Ethernet ports are available with support

for fiber-optic and RJ45 interfaces.

•The IEC 61850 protocol has been added.

1.3 NGR Sensitive Open and Short Detection

(firmware version 3.10 and higher)

The SE-330 and SE-330HV can be configured to trip if

the NGR resistance decreases to a value less than 10 to

70% of the Nominal NGR Resistance value, or if the

NGR resistance increases to a value greater than 120 to

1000% of the Nominal NGR Resistance value.

The SE-330AU can be configured to trip if the NER

resistance decreases to a value less than 50 to 70% of

the Nominal NER Resistance value, or if the NER

resistance increases to a value greater than 130 to

200% of the Nominal NER Resistance value.

The Nominal NGR Resistance value, NGR Short Trip

Level, and several other values can be configured using

SE-MON330. For more details about how to change

these values, refer to Appendix A.

2. Operation

2.1 Settings

2.1.1 GF Trip Time

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

10.0 seconds for the SE-330 and SE-330HV, and from

0.1 to 0.5 seconds for the SE-330AU. Time-coordinated

ground-fault protection requires this setting to be longer

than the trip times of downstream ground-fault devices.

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 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.

2.1.2 GF Trip Level

The SE-330 series uses a Discrete-Fourier Transform

(DFT) Algorithm to measure the fundamental component

of NGR current.

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

trip level according to the guidelines in Section 1.1.

For the SE-330 and SE-330HV, set the ground-fault trip

level as a percentage (2 to 100) of the CT-primary rating.

For the SE-330AU, the earth-fault trip level is adjustable

from 0.125 to 5 A for the EFCT-X and 0.75 to 30 A for

the SE-CS30-x.

When the GF Trip Level is set to MEM, the ground-fault

setting stored in non-volatile memory is used. This

parameter must be set using a PC running the SE-

MON330 software connected to the USB interface. The

setting range is 2 to 100% of CT primary rating in 1%

increments. The default value is 15%.

For the SE-330 and SE-330HV, 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 Tables 1 and 2. Ground-fault trip levels for

selected CTs are shown in Table 3. For other systems,

refer to the NGR Monitor Set-Point Assistant at

http://www.littelfuse.com/relayscontrols. The Set-Point

Assistant is included with the SE-MON330 software.

2.1.3 VN Trip Level

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

fundamental component of neutral voltage (VN).

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

neutral voltage is greater than the VNTRIP 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 VNTRIP LEVEL setting for an interval greater

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

also trip.

For the SE-330 and SE-330AU, the VNTRIP LEVEL range

is 20 to 2,000 V with switch S5 in the 20-kΩ(Vx1) position,

and the range is 100 to 10,000 V with switch S5 in the

100-kΩ(Vx5) position.

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

For the SE-330HV, the VNTRIP LEVEL range is 100 to

10,000 V with switch S5 in the 100-kΩ(Vx1) position, and

the range is 200 to 20,000 V with switch S5 in the 200-kΩ

(Vx5) position.

Calculate the voltage across the NGR when NGR current

is equal to the pick-up current of the ground-fault circuit.

Set the VNTRIP LEVEL at the next largest value. See Fig.

1 and Section 2.1.5.5.

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

shown in Tables 1 and 2. For an NGR resistance greater

than 2 kΩ, use a 100-kΩsensing resistor. For other

systems, refer to the NGR Monitor Set-Point Assistant at

www.littelfuse.com/relayscontrols.

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

Table 1. Typical Values for Tripping Systems (SE-330 and SE-330HV)

SYSTEM

VOLTAGE

(LINE-LINE)

NEUTRAL-GROUNDING

RESISTOR SENSING RESISTOR

GROUND-

FAULT

TRIP LEVEL

VNTRIP

LEVEL

(VOLTS)

CURRENT

(AMPERES)

RESISTANCE

(OHMS) MODEL

RESISTANCE

(SWITCH S5

SETTING)

(AMPERES)

(VOLTS)

480

600

2,400

4,160

480

600

2,400

4,160

7,200

14,400

4,160

7,200

14,400

25,000

35,000

72,000

100

277

480

160

277

554

166

332

577

808

420

ER-600VC

ER-5KV

ER-600VC

ER-5KV

ER-15KV

ER-5KV

ER-15KV

ER-25KV

ER-35KV

ER-72KV

20 kΩ

100 kΩ

20 kΩ

100 kΩ

200 kΩ

1.0

3.0

5.0

20.0

100

340

800

100

340

800

170x5=850

340x5=1,700

800

170x5=850

340x5=1,700

800x5=4,000

1,200x5=6,000

6,000 x 2

=12,000

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

Table 2. Typical Values for Tripping Systems (SE-330AU)

SYSTEM VOLTAGE

(VOLTS) NEUTRAL-EARTHING RESISTOR

EARTH-FAULT TRIP LEVEL

(AMPERES) VNTRIP

LEVEL

(VOLTS)

SENSING

RESISTOR S5

LINE TO

LINE

LINE TO

NEUTRAL

CURRENT

(AMPERES)

RESISTANCE

(OHMS)

EFCT-X

(5-A RATING)

SE-CS30-X

(30-A

RATING)

110 (3) 55 5 11 0.5 (1) 20 ER-600VC 20 kΩ

110

0.5

(1)

ER-600VC

20 k

Ω

240 (3) 120 5 24 0.5 (1) 20 ER-600VC 20 kΩ

240 139 5 28 0.5 (1) 20 ER-600VC 20 kΩ

415

240

0.5

(1)

ER-600VC

20 k

Ω

433

250

0.5

(1)

ER-600VC

20 kΩ

690 398 5 80 0.5 (1) 60 ER-600VC 20 kΩ

1,000 575 5 115 0.5 (1) 60 ER-5KV 20 kΩ

1,050

605

121

0.5

(1)

100

ER-5KV

20 k

Ω

1,100 635 5 127 0.5 (1) 100 ER-5KV 20 kΩ

3,300 1,905 5 381 0.5 (1) 200 ER-5KV 20 kΩ

6,600

3,810

762

0.5

(1)

500

ER-15KV

100 k

Ω

6,600 3,810 10 381 1.0 0.75 500 ER-15KV 100 kΩ

6,600 3,810 25 152 2.0 1.5 500 ER-15KV 100 kΩ

11,000

6,350

1,270

0.5

(1)

650

ER-15KV

100 k

Ω

11,000

6,350

635

1.0

0.75

650

ER-15KV

100 kΩ

11,000 6,350 20 318 2.0 1.5 650 ER-15KV 100 kΩ

11,000 6,350 25 254 2.0 2.4 650 ER-15KV 100 kΩ

22,000

12,700

2,540

0.5

(1)

1,700

ER-25KV

100 k

Ω

22,000

12,700

1,270

1.0

0.75

1,700

ER-25KV

100 kΩ

22,000 12,700 20 635 2.0 1.5 1,700 ER-25KV 100 kΩ

22,000

12,700

508

2.0

2.4

1,700

ER-25KV

100 k

Ω

22,000

12,700

254

(2)

8,500

ER-25KV

100 kΩ

33,000 19,050 50 380 (2) 24 10,000 ER-35KV 100 kΩ

(1) Minimum setting is 0.75 A. Use EFCT-x for AS/NZS 2081:2011 compliance.

(2) Maximum setting is 5 A.

(3) Single phase, centre tap.

SE-330 Series Neutral-Grounding-Resistor Monitor

Rev.11-B-121520

Table 3. Ground-Fault Trip Levels for Selected CTs (SE-330 and SE-330HV)

GF TRIP

LEVEL(1)

(%)

EFCT-x

5:0.05

(AMPERES)

SE-CS30-x

30:0.05

(AMPERES)

50:1

50:5

(AMPERES)

100:1

100:5

(AMPERES)

200:1

200:5

(AMPERES)

400:1

400:5

(AMPERES)

100

0.10

0.20

0.30

0.40

0.50

1.00

2.00

3.00

4.00

5.00

0.60

1.20

1.80

2.40

3.00

6.00

12.0

18.0

24.0

30.0

100

120

160

200

160

240

320

400

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

* Setting not recommended.

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