6FABDE6F52F04802A7E9984434E11818

3714 Kinnear Place
Saskatoon, SK
Canada
S7P 0A6
Ph: (306) 373-5505
Fx: (306) 374-2245 www.littelfuse.com/relayscontrols
SE-330 MANUAL
NEUTRAL-GROUNDING-RESISTOR MONITOR
REVISION 10-K-090815
LITTELFUSE STARTCO
NEUTRAL-GROUNDING-RESISTOR
MONITOR
SE-330
RESISTOR
FAULT
GROUND
FAULT
DIAGNOSTIC
TRIP
TRIP
CALIBRATED
RELAY K1
8
6
10
20
40
60
80
4
100
2
MEM
GF TRIP LEVEL
(% CT RATING)
0.5 0.7 1.0
0.4
0.3
0.2
0.1
2.0
3.0
5.0
10.0
POWER
170
130
100
200
340
800
1200
60
1700
20
2000
VN TRIP LEVEL
(S5
CAL
GF TRIP TIME (s)
20 K Ω
VN x 1
100 K Ω)
VN x 5
1.8 2.0 2.2
1.6
2.4
1.4
2.6
1.2
2.8
1.0
3.0
PULSE PERIOD (s)
RESET
Copyright  2015 Littelfuse Startco
All rights reserved.
Document Number: PM-1200-EN
Printed in Canada.
SE-330 Neutral-Grounding-Resistor Monitor
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Page i
Rev. 10-K-090815
Page ii
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
TABLE OF CONTENTS
SECTION
PAGE
General ................................................................. 1
1.1 Modern Resistance-Grounded Systems ................ 1
1.2 SE-330 NGR Monitoring ...................................... 1
2
Operation ............................................................. 2
2.1 Settings.................................................................. 2
2.1.1 GF Trip Time ............................................. 2
2.1.2 GF Trip Level ............................................ 2
2.1.3 VN Trip Level............................................. 2
2.1.4 Pulse-Period Adjustment ........................... 3
2.1.5 Configuration Settings ............................... 3
2.1.5.1 Relay K1 Function (S1) ................ 4
2.1.5.2 Trip-Relay Mode and
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............................................................. 4
2.3 Pulsing Operation .................................................. 5
2.4 Trip Indication and Reset ...................................... 5
2.5 Remote Operation ................................................. 5
2.6 Relay K1 LED....................................................... 5
2.7 Unit Healthy Output .............................................. 5
2.8 Diagnostic LED..................................................... 5
2.9 Analog Output ....................................................... 6
3
Installation ........................................................... 6
3.1 SE-330 .................................................................. 6
3.2 Sensing Resistor .................................................. 12
3.3 Ground-Fault CT ................................................. 20
3.4 Isolated Ground Connection ............................... 25
3.5 Pulsing Connection ............................................. 25
4
Data Interfaces .................................................. 26
4.1 SD Card............................................................... 26
4.1.1 Datalogging.............................................. 26
4.1.2 Firmware Upgrade ................................... 26
4.2 USB Interface...................................................... 26
4.3 Network Communications .................................. 26
5
Troubleshooting ................................................ 27
6
Technical Specifications.................................... 29
6.1 SE-330 ................................................................ 29
6.2 Sensing Resistors ................................................ 31
6.3 Current Sensors ................................................... 32
7
Ordering Information ....................................... 33
8
Warranty ........................................................... 34
9
Test Procedures ................................................. 34
9.1 Resistor-Fault Tests............................................. 34
1
9.1.1 Calibration and Open Test ........................34
9.1.2 Voltage Test .............................................34
9.2 Sensing-Resistor Test ..........................................34
9.3 Analog-Output Test .............................................34
9.4 Ground-Fault Performance Test ..........................35
Appendix A SE-330 Revision History ............................. 36
LIST OF FIGURES
FIGURE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
PAGE
Configuration Switches ............................................3
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
ER-600VC Installed in SE-MRE-600 ......................14
ER-5KV Sensing Resistor ......................................15
ER-5WP Sensing Resistor ......................................16
ER-15KV Sensing Resistor ....................................17
ER-25KV Sensing Resistor ....................................18
ER-35KV Sensing Resistor ....................................19
EFCT-1 Ground-Fault Current
Sensor .....................................................................21
SE-CS30-70 Ground-Fault
Current Sensor ........................................................22
EFCT-26 and SE-CS30-26 GroundFault Current Sensors .............................................23
RK-332 Remote Indication and Reset ....................24
PGA-0520 Analog Percent Current Meter .............24
Simplified Isolated-Ground Connection .................25
Simplified Pulsing Connection ...............................25
Ground-Fault-Test Circuits ....................................35
LIST OF TABLES
TABLE
1
2
3
PAGE
Typical Values for Tripping Systems .......................3
Ground-Fault Trip Levels for Selected CT’s ............3
Ground-Fault-Test Record......................................35
DISCLAIMER
Specifications are subject to change without notice.
Littelfuse Startco 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 Neutral-Grounding-Resistor Monitor
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Page iii
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
1. GENERAL
1.1 MODERN RESISTANCE-GROUNDED SYSTEMS
A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current
to limit ground-fault current. This is an improvement
over low-resistance or solidly-grounded systems because,
in those systems, a ground-fault flash hazard exists and a
ground fault can result in substantial point-of-fault
damage. High-resistance grounding eliminates these
problems and modern ground-fault protection operates
reliably 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 CEC 10-1102, NEC 250.36,
and NEC 250.186 for application details.
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 and 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—this value 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 lowvoltage 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.

Page 1
Rev. 10-K-090815
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 groundfault protection, and ensure a stable system not subject to
ferroresonance.
1.2 SE-330 NGR MONITORING
The SE-330 is a microprocessor-based neutralgrounding-resistor monitor that detects NGR failures and
ground faults in resistance-grounded systems.
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-k ER-series sensing resistor, and a current
transformer (CT).
Power-circuit elements, other than neutral-connected
NGR’s, 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 (PT’s), 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 and
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 VN TRIP LEVEL
setting and if NGR current is less than 5% of the current
transformer (CT) rating, the SE-330 will trip on resistor
fault. If the resistor-fault circuit is tripped and the neutral
voltage exceeds the VN TRIP 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, or by a CT (EFCT-x or SE-CS30-x) with a
50-mA secondary. 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.
The SE-330 has four output relays. Relay K1 can be
assigned a trip or a pulsing function. Relays K2 and K3
provide ground-fault and resistor-fault indication. K4 is a
solid-state relay that provides UNIT HEALTHY
indication. When relay K1 is assigned the trip function, it
will operate on either a resistor fault or ground fault, and
it can be set to operate in the fail-safe or non-fail-safe
mode for undervoltage or shunt-trip applications. When
SE-330 Neutral-Grounding-Resistor Monitor
the pulsing function is selected, relay K1 is used to
control a contactor to assist in locating faults.
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 provides additional features over the
SE-330 legacy model (revision 04 or less):
 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-failsafe.
 The number of trip records has been increased to 100
and includes date and time stamping.
 A microSD™ card interface can be used for longterm data logging and firmware updates.
A
microSD™ card and a microSD-to-SD adapter 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.
 Dual Ethernet ports are available with support for
fiber-optic and RJ45 interfaces.
 The IEC 61850 protocol has been added.
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. 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.
Page 2
Rev. 10-K-090815
2.1.2 GF TRIP LEVEL
The SE-330 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. Set the
ground-fault trip level as a percentage (2 to 100) of the CTprimary rating. 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%. Inputs are provided
for 5-, 1-, and 0.05-A-secondary CT’s. Typical values for
5-, 15-, and 25-A tripping systems are shown in Table 1.
Ground-fault trip levels for selected CT’s are shown in
Table 2. For other systems, refer to the NGR Monitor SetPoint
Assistant
at
www.littelfuse.com/
relayscontrols. The Set-Point Assistant is included with the
SE-MON330 software.
2.1.3 VN TRIP LEVEL
The SE-330 uses a DFT algorithm to measure the
fundamental component of neutral voltage (VN).
If neutral voltage is greater than the VN TRIP LEVEL
setting for the duration of the resistor-fault trip time and
ground-fault 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 VN TRIP
LEVEL setting for an interval greater than the GF TRIP
TIME setting, the ground-fault circuit will also trip.
The VN TRIP LEVEL range is 20 to 2,000 V with switch
S5 in the 20-k (Vx1) position, and the range is 100 to
10,000 V with switch S5 in the 100-k (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 VN TRIP 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 Table 1. For an NGR resistance greater than 2
k, use a 100-k sensing resistor. For other systems, refer
to the NGR Monitor Set-Point Assistant at
www.littelfuse.com/relayscontrols.
NOTE: A resistor-fault trip is held off if the ground-fault
current is above 5% of the CT rating.
Page 3
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
TABLE 1. TYPICAL VALUES FOR TRIPPING SYSTEMS
SYSTEM
VOLTAGE
(LINE-LINE)
(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
NEUTRAL-GROUNDING
RESISTOR
CURRENT
(AMPERES)
5
5
5
5
15
15
15
15
15
15
25
25
25
25
25
RESISTANCE
(OHMS)
55
69
277
480
18
23
92
160
277
554
96
166
332
577
808
SENSING RESISTOR
MODEL
GROUNDFAULT
TRIP LEVEL
VN TRIP
LEVEL
(AMPERES)
(VOLTS)
1.0
1.0
1.0
1.0
3.0
3.0
3.0
3.0
3.0
3.0
5.0
5.0
5.0
5.0
5.0
60
100
340
800
60
100
340
800
170x5=850
340x5=1,700
800
170x5=850
340x5=1,700
800x5=4,000
1,200x5=6,000
200:1
200:5
(AMPERES)
*
*
12
16
20
40
80
120
160
200
400:1
400:5
(AMPERES)
*
16
24
36
40
80
160
240
320
400
RESISTANCE
(SWITCH S5
SETTING)
20 k
20 k
20 k
20 k
20 k
20 k
20 k
20 k
100 k
100 k
20 k
100 k
100 k
100 k
100 k
ER-600VC
ER-600VC
ER-5KV
ER-5KV
ER-600VC
ER-600VC
ER-5KV
ER-5KV
ER-15KV
ER-15KV
ER-5KV
ER-15KV
ER-15KV
ER-25KV
ER-35KV
TABLE 2. GROUND-FAULT TRIP LEVELS FOR SELECTED CT’S
GF TRIP
LEVEL(1)
(%)
2
4
6
8
10
20
40
60
80
100
EFCT-x
5:0.05
(AMPERES)
SE-CS30-x
30:0.05
(AMPERES)
50:1
50:5
(AMPERES)
*
*
*
*
5
10
20
30
40
50
100:1
100:5
(AMPERES)
*
*
*
8
10
20
40
60
80
100
0.10
0.60
0.20
1.20
0.30
1.80
0.40
2.40
0.50
3.00
1.00
6.00
2.00
12.0
3.00
18.0
4.00
24.0
5.00
30.0
(1)
When set to MEM, range is 2 to 100% in 1% increments.
* Setting not recommended.
2.1.4 PULSE-PERIOD ADJUSTMENT
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%. For example, with the 1.0-s setting, relay
K1 will alternately be energized for 0.5 seconds and deenergized for 0.5 seconds when pulsing is enabled.
See Section 2.3 for detailed pulsing operation
information.
NOTE: For pulsing configuration, set switch S1 to K1 =
PULSING and install an external pulse-enable switch.
CALIBRATION BUTTON
K1 = TRIP
K1 FAIL-SAFE
S2 K1 NON-FAIL-SAFE
LATCHING GF TRIP
S3 NON-LATCHING GF TRIP
LATCHING RF TRIP
S4 NON-LATCHING RF TRIP
20 kΩ
S5 100 kΩ
50 Hz
S6 60 Hz
NOT USED
RUN
2.1.5 CONFIGURATION SETTINGS
Eight configuration switches (S1 to S8) and a
calibration button are located behind the access cover on
the front panel. See Fig. 1.
S1 K1 = PULSING
S7
S8 UPGRADE
NOTE:
1. DEFAULT SETTINGS SHOWN.
FIGURE 1. Configuration Switches.
SE-330 Neutral-Grounding-Resistor Monitor
2.1.5.1 RELAY K1 FUNCTION (S1)
Set switch S1 to K1 = TRIP to assign the trip function
to relay K1 and to activate switch S2. Relay K1 will
change state when a resistor-fault or ground-fault trip
occurs.
Set switch S1 to K1 = PULSING to configure relay K1
for pulsing operation. See Section 2.3.
2.1.5.2 TRIP-RELAY MODE AND TRIP-MEMORY
MODE (S2)
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.
In the fail-safe mode, relay K1 energizes and its contact
closes if there are no trips. Contacts open if there is a trip,
a loss of supply voltage, or a processor failure. In the
fail-safe mode, SE-330 trips are not reset when supply
voltage is cycled.
NOTE: Switch S2 does not affect the operating modes of
relays K2, K3, and K4.
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.
2.1.5.3 GROUND-FAULT-TRIP LATCH (S3)
Set switch S3 to select latching or non-latching groundfault-circuit operation. Non-latching operation defeats
ground-fault-trip memory. See Sections 2.1.5.2 and 2.4.
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
defeats resistor-fault-trip memory. See Sections 2.1.5.2
and 2.4
2.1.5.5 SENSING-RESISTOR SELECTION (S5)
Set switch S5 to the resistance of the sensing resistor. For
the ER-600VC, ER-5KV, and ER-5WP, select 20 k. For
the ER-15KV, ER-25KV, and ER-35KV, select 100 k.
Switch S5 sets the resistor-fault trip value and the VN TRIP
LEVEL range. See Section 2.1.3.
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.
2.1.5.7 UPGRADE MODE (S8)
The microSD™ card is used for firmware upgrades.
See Section 4.1.2 for upgrade instructions.
NOTE: An upgrade causes an SE-330 restart and this may
cycle the output relays.
Page 4
Rev. 10-K-090815
2.1.6 RESISTOR-FAULT TRIP TIME
The resistor-fault trip time can be adjusted from 12
(default) to 60 seconds using the SE-MON330 software or
via network communications.
2.1.7 RESISTOR-FAULT TRIP LEVEL
The resistor-fault trip level can be adjusted using the
SE-MON330 software or via network communications.
See Section 6.1.
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 rare conditions,
this can cause a false resistor-fault trip. Enabling the geomagnetic filter and increasing the resistor-fault trip time
can help counteract these effects.
A trip time of 30 seconds is recommended when the
geo-magnetic filter is enabled.
The geo-magnetic filter is disabled by default, but can
be enabled using the SE-MON330 software or via
network communications.
2.2 CALIBRATION
The SE-330 measures the resistance change of the
NGR relative to the NGR-resistance value determined at
the time of calibration. When the resistance change is
greater than a threshold amount (500 Ω for 20-kΩ
systems, 2,500 Ω for 100-kΩ systems), a resistor-fault trip
occurs. Calibrate the SE-330 on new installations, if the
NGR is changed, or if the sensing resistor is changed.
NOTE: If the SE-330 is not calibrated and is supplied
from the load side of the breaker (non-fail-safe mode),
calibrate within the resistor-fault trip time after power-up
or it may trip and interrupt its supply. See Section 2.1.6.
The CALIBRATION button is located behind the
access cover on the front panel, and it 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, press and hold the CALIBRATION button
until the green CALIBRATED LED turns off and returns
to on (if the LED is already off, press and hold 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 SE-330 may be calibrated remotely using
the SE-MON330 software with the USB interface or the
communications options.
SE-330 Neutral-Grounding-Resistor Monitor
If latching resistor fault (switch S4) is selected, the
calibration-error code flashes until RESET is pressed
even if the CALIBRATED LED is on.
The calibration value is stored in non-volatile memory.
2.3 PULSING OPERATION
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 and cycle time is adjustable
from 1.0 to 3.0 seconds. When terminals 16 and 17 are
not connected, K1 is not energized and its contact is open.
Relay K1 can be used to control a contactor 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.
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 pulsing current is
detected on a cable or conduit, the fault is downstream.
Systematic testing allows faults to be located without
isolating feeders or interrupting loads.
Stop pulsing when a fault is located.
2.4 TRIP INDICATION AND RESET
Red LED's and indication relays indicate ground-fault
and resistor-fault trips. The indication relays K2 (GF) and
K3 (RF) operate in 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.
When a trip occurs with latching operation selected, the
SE-330 remains tripped until reset with the front panel
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 automatically reset when the
fault clears and power-up trip memory is defeated even
when configuration switch S2 is set to fail-safe. The
maximum automatic reset time is 2.8 s.
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, the SE-330 returns to its state prior to loss
of supply voltage unless switch S3 or S4 is set to nonlatching. When supply voltage is applied with switch S2
set to NON-FAIL-SAFE, SE-330 trips are reset. When a
local, remote, or network reset is issued, both trip LED's
will flash if they are off.
Resistor-fault-trip reset can take up to one second.
Resistor-fault trip-memory trip can take up to three
seconds after SE-330 power up.
Page 5
Rev. 10-K-090815
2.5 REMOTE 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. 19. Connect them as shown in Fig. 3.
RK-332 components are not polarity sensitive.
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.
Network-enabled SE-330’s 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.
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
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.
NOTE: K4-contact rating is 100 mA maximum.
2.8 DIAGNOSTIC LED
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.
See Section 5.
SE-330 Neutral-Grounding-Resistor Monitor
2.9 ANALOG OUTPUT
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 panelmounted to display the NGR current. See Fig. 20 and
Section 7.
+24V 18
+
19
-
20
0V
21
SELF-POWERED
PGA-0520
+24V 18
+
+
19
-
20
0V
21
LOOP
SUPPLY
PGA-0520
LOOP POWERED
FIGURE 2. Analog-Output Connections.
Page 6
Rev. 10-K-090815
3. INSTALLATION
3.1 SE-330
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 four
included 8-32 locknuts and flat washers.
If an optional SE-IP65CVR-G Hinged Cover is used,
follow the included installation instructions. See Figs. 6
and 7.
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.
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.
Ground terminal 7 (G) and connect terminal 6 (R) to
the sensing-resistor R terminal.
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. Connect terminal 4 (SPG) to terminal 5
(SPGA).
NOTE: Disconnect terminal 1 (L1) and terminal 2 (L2/N)
before performing dielectric strength testing of the control
panel.
Page 7
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
TRANSFORMER
OR GENERATOR
NOTE 1
NOTE 12
XXX:1 OR
S
9
EFCT-X
OR
SE-CS30-X
XXX:5
1
10
5
11
8
C
9
S
5
1
NOTE 4
G
1
NOTE 6
L2/N
L1
K1
22
6
7
25
K3
28
K4
REMOTE
RESET
PULSE
ENABLE
15
16
17
UNIT HEALTHY
NOTE 7 +24V
NO
CONNECTION
+
ANALOG OUTPUT
RESET
5
RESISTOR
FAULT
0V
19
SE-330
INDICATION
R
GROUND-FAULT
TRIP
R
RESISTORFAULT TRIP
R
DIAGNOSTIC
G
CALIBRATED
Y
RELAY K1
G
POWER
2. LOCATE THESE COMPONENTS NEAR
TRANSFORMER OR GENERATOR.
3. ALTERNATE SENSING-RESISTOR
TERMINAL-N CONNECTION. THE NEUTRAL
CONNECTION IS NOT MONITORED.
5. SEE SECTION 3.4 FOR ISOLATED-GROUND
CONNECTION.
PGA-0520
SPG
OPTIONAL
NETWORK COM
NOTE 10
1. USE SEPARATE LUG TO CONNECT SENSINGRESISTOR TERMINAL N TO NEUTRAL.
NOTE 15
USB PORT
NOTE 9
SPGA
NOTES:
NOTE 8
20
21
NOTE 5
4. VOLTAGE BETWEEN SENSING-RESISTOR
TERMINALS R AND G IS LIMITED TO 100 V BY
INTERNAL CLAMP.
18
PULSE ENABLE
3
4
GROUND
FAULT
13
12
NOTE 14
C
27
RF
14
NOTE 13 & 14
24
GF
29
N/- SUPPLY
2
23
K2
26
G
R
R
ALTERNATE CT
CONNECTIONS
L/+ SUPPLY
NGR
C
5A
1A
EFCT
SE-330
C
NOTE 3
ER-SERIES
SENSING
RESISTOR
NOTE 17
10 11
NOTE 16
NOTE 2
NOTES 11 & 12
N
8
NEUTRAL
MICRO SD
SLOT
6. RELAY CONTACTS SHOWN WITH SE-330
DE-ENERGIZED.
7. OPTIONAL N.C. K4 AVAILABLE.
8. LOOP-POWERED CONNECTION USES
TERMINALS 19 AND 20 ONLY.
9. MINI B USB DEVICE CONNECTOR.
10. REFER TO APPROPRIATE SE-330
COMMUNICATIONS INTERFACE MANUAL.
11. TWO-CONDUCTOR TWISTED CABLE
REQUIRED, SHIELDED RECOMMENDED.
12. CT CONNECTION IS NOT POLARITY
SENSITIVE.
13. CONNECT CONTACTS K1, K2, K3, AND K4
AS REQUIRED FOR PROTECTION,
INDICATION, AND CONTROL.
14. EXTERNAL LIGHTS AND SWITCHES NOT
INCLUDED WITH SE-330.
15. SELF-POWERED 4-20 mA OUTPUT.
16. TYPICAL TRIPPING SYSTEM.
17. GROUND CURRENT SENSOR AT TERMINAL 11
ONLY.
FIGURE 3. SE-330 Connection Diagram.
Page 8
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
16.0
132.0
(5.20)
(0.63)
98.3
PANEL THICKNESS
1.6 (0.06) TO 4.8 (0.19)
(3.87)
LITTELFUSE STARTCO
NEUTRAL-GROUNDING-RESISTOR
MONITOR
SE-330
RESISTOR
FAULT
GROUND
FAULT
DIAGNOSTIC
TRIP
1
2
3
4
5
CALIBRATED
20
40
60
80
4
100
2
MEM
GF TRIP LEVEL
(% CT RATING)
0.5 0.7 1.0
0.4
0.3
0.2
0.1
2.0
3.0
5.0
10.0
POWER
170
130
100
200
340
800
1200
60
1700
20
2000
VN TRIP LEVEL
(S5
CAL
GF TRIP TIME (s)
20 K Ω
VN x 1
185.4
(7.30)
10
212.6
(8.37)
RELAY K1
8
6
12
13
NC - 14
15
RESET
16
PULSE ENABLE
17
+ 24V - 18
+ - 19
ANALOG OUTPUT
- - 20
0V - 2 1
UNIT
HEALTHY K4
TRIP
100 K Ω)
VN x 5
1.8 2.0 2.2
1.6
2.4
1.4
2.6
1.2
2.8
1.0
3.0
-
L1
L2/N
SPG
SPGA
ATTENTION
DISENGAGE CAPTIVE RETAINING
S C R E W S BE F O R E R E M O V I N G
P L U G -I N T ER M I NA L B LO CK S
6 - R
7 - G
SENSING
RESISTOR
PULSE PERIOD (s)
8 9 10 11-
RESET
FRONT VIEW
SIDE VIEW
92.7
(3.65)
7.0
(0.28)
PANEL-MOUNT CUTOUT
FIGURE 4. SE-330 Outline and Panel-Mounting Details.
RESISTOR
FAULT
K3
24
25
26
27
28
29
REAR VIEW
1. DIMENSIONS IN MILLIMETRES (INCHES).
R=4.8 (0.19)
MAXIMUM
4.75 (0.187) DIA
4 LOCATIONS
GROUND
FAULT
K2
22
23
NOTES:
76.2
(3.00)
186.0
(7.32)
200.0
(7.87)
8.2
(0.32)
S
E
1
F
5 5 A1 C
T
C A
K1
Page 9
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
114.3
8.0
(0.31)
RETAINER SCREW
RETAINER
6.4
(0.25)
(4.50)
98.3
(3.87)
138.0
(5.43)
LITTELFUSE STARTCO
NEUTRAL-GROUNDING-RESISTOR
MONITOR
RESISTOR
FAULT
GROUND
FAULT
DIAGNOSTIC
TRIP
L1 - 1
L2/N - 2
- 3
SPG - 4
SPGA - 5
20
40
60
80
100
2
MEM
GF TRIP LEVEL
(% CT RATING)
0.5 0.7 1.0
POWER
R - 6
G - 7
2.0
3.0
5.0
10.0
(S5
CAL
GF TRIP TIME (s)
GROUND
FAULT
K2
RESISTOR
FAULT
K3
S - 8
E
1 - 9
F
C 1
T A 5 5 -1 0
A C -1 1
340
800
1200
20 K Ω
VN x 1
100 K Ω)
VN x 5
1.8 2.0 2.2
1.6
2.4
1.4
2.6
1.2
2.8
1.0
3.0
6
7
PULSE PERIOD (s)
8
9
10
11
RESET
FRONT VIEW
SE-330-SMA
25.4
(1.00)
200
60
1700
20
2000
VN TRIP LEVEL
FRONT VIEW
63.5
(2.50)
SIDE VIEW
5.0
(0.20)
24
25
26
27
28
29
SENSING
RESISTOR
0.4
0.3
0.2
0.1
170
130
100
225.4
(8.87)
RELAY K1
10
4
K1
1
2
3
4
5
CALIBRATED
8
6
22
23
TRIP
212.6
(8.37)
12
NIT
K4 U
HEALTHY
13
14 - NC
15
RESET
16
PULSE ENABLE
17
18 - + 24V
19- +
ANALOG OUTPUT
20 - 2 1 - 0V
SE-330
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
(NOTE 2)
2. MOUNTING SCREWS: M4 OR 8-32 PANHEAD.
INSTALLATION
215.9
(8.50)
1. LOOSEN RETAINER SCREWS, MOVE RETAINERS
OUTWARD AND TIGHTEN RETAINER SCREWS.
2. MATE MONITOR WITH ADAPTER PLUG-IN TERMINALS.
LOOSEN RETAINER SCREWS TO LET RETAINERS
SNAP OVER MONITOR BACKPLATE.
3. ENSURE THAT RETAINERS ARE AGAINST MONITOR
BODY AND TIGHTEN RETAINER SCREWS.
REMOVAL
1. LOOSEN RETAINER SCREWS, SLIDE RETAINERS AWAY
FROM MONITOR BODY AND TIGHTEN RETAINER SCREWS.
BEZEL OUTLINE
ADAPTER PANEL OUTLINE
MOUNTING DETAIL
FIGURE 5. SE-330 Outline and Surface-Mounting Details.
2. PULL MONITOR FORWARD.
Page 10
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
34.0
(1.34)
TO PREVENT UNAUTHORIZED ENTRY:
1. USE WIRE SEAL THROUGH HOLES IN
WEATHERPROOF COVER ASSEMBLY, OR
2. SECURE WITH THE PLASTIC THREAD FORMING
SCREW SUPPLIED IN KIT.
SHOWN
WITH
SEAL
(9.84)
250.0
TOP VIEW
HOLE FOR
SEAL WIRE
127.0
(5.00)
FRONT VIEW
NOTES:
1. DIMENSIONS SHOWN IN MILLIMETRES (INCHES).
2. SHOWN WITH WEATHERPROOF SNAPS CLOSED.
3. REFER TO PANEL MOUNTING CUTOUT (FIGURE 4) FOR PANEL
MOUNTING DETAIL.
FIGURE 6. SE-IP65CVR-G Weatherproof Cover Outline.
SIDE VIEW
Page 11
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
INSTALL O-RING INTO
GROOVE IN THE REAR
OF WEATHERPROOF
WINDOW
INSERT THE SE-330 THROUGH OPENING
OF THE WEATHERPROOF WINDOW, UNTIL IT
IS SECURELY NESTED TO THE BACK OF THE
DARK GREY PVC PANEL.
FRONT-PANEL
DETAILS NOT SHOWN.
INSTALL O-RING INTO THE GROOVE IN THE REAR
OF WEATHERPROOF WINDOW ASSEMBLY.
INSERT ASSEMBLY INTO PANEL AND FASTEN WITH
THE HARDWARE PROVIDED WITH THE SE-330.
FIGURE 7. SE-IP65CVR-G Weatherproof Cover Installation.
SE-330 Neutral-Grounding-Resistor Monitor
If a ground fault in the sensing-resistor conductor is
unlikely, a minimal loss of protection will result if it does
not pass through the ground-fault-CT window. 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 which 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 sensingresistor terminal N and the NGR to the neutral to include
neutral connections in the monitored loop. Alternately, if
the NGR connection to system neutral need not 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 NGR’s.
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 Section 10-1108 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
more than sufficient.
RATINGS:
MAXIMUM VOLTAGE . 600 Vac
MAXIMUM CURRENT . 30 mA
RESISTANCE . . . . . . . 20 kΩ
THERMAL:
600 Vac . . . . . . . . . . 6 MINUTES ON,
60 MINUTES OFF
420 Vac . . . . . . . . . . CONTINUOUS
41.5
40.0
(1.63)
(1.57)
89.0
(3.50)
(0.31)
(4.13)
105.0
C
4.5 (0.18) DIA
C’BORE 10.0 (0.39) DIA
3.2 (0.13) DEEP
FRONT
8.0
Use with:
Duty Cycle:
Rating:
SENSING RESISTOR
Serial No: GC131105487
LR 53428
US I E E E 3 2
ER-600VC
Revision: 02
SENSI NG RES I STOR
2 0 KΩ
6 0 0 V AC MA X
NOTE 3
R
ER-600VC
1-800-TEC-FUSE (1-800-832-3873)
Made in Saskatoon, Canada
105.0
G
(4.13)
R
SE-325, SE-330, SE-330AU
10.5
(0.41)
600 Vac 50/60 Hz
30 mA Max
20 KΩ
19.0
(0.75)
6 Minutes On, 60 Minutes Off
at 600 Vac
Continuous at 420 Vac
10.5
(0.41)
8.0
22.2
(0.87)
(0.31)
40.0
(1.57)
N
SIDE
MOUNTING DETAIL
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25.
3. MOUNTING SCREWS: M4 OR 8-32.
4. ON REVISION 2 UNITS ENCLOSURE IS ELECTRICALLY CONNECTED TO
TERMINAL G THROUGH JUMPER FROM TERMINAL G TO
SCREW.
THIS CONNECTION MAY BE REMOVED FOR DIELECTRIC STRENGTH
TESTING. ENSURE THAT THE JUMPER IS INSTALLED AFTER TESTING.
5. ON REVISION 1 UNITS, SCREW IS NOT PRESENT AND ENCLOSURE IS
ELECTRICALLY CONNECTED TO TERMINAL G.
6. NOT ALL CERTIFICATIONS SHOWN.
FIGURE 8. ER-600VC Sensing Resistor.
Page 12
Rev. 10-K-090815
Page 13
Rev. 10-K-090815
(4.80)
122.0
(4.80)
122.0
SE-330 Neutral-Grounding-Resistor Monitor
GASKET
120.4
(4.74)
120.4
(4.74)
ENCLOSURE - TOP VIEW
COVER - INSIDE VIEW
(COVER REMOVED)
122.0
(4.80)
ENCLOSURE - TOP VIEW
MOUNTING DETAIL
120.4
(4.74)
20.4
(0.80)
NOTES:
84.6
(3.33)
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M6 OR 0.25-20.
ENCLOSURE - SIDE VIEW
FIGURE 9. SE-MRE-600 Moisture-Resistant Enclosure Outline.
82.5
120.4
(4.74)
(13.25)
M6 OR 0.25-20
19.1
82.5
(3.25)
(0.75)
9.5
(0.38)
Page 14
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
NOTE 2
MOUNTING
SCREWS
4 LOCATIONS
NOTE 4
N
R
G
NOTE 3
ER-600VC
SENSI NG RES I STOR
2 0 KΩ
6 0 0 V AC M A X
NOTE 2
ENCLOSURE - TOP VIEW
COVER - INSIDE VIEW
(COVER REMOVED)
ASSEMBLY INSTRUCTIONS
1. DRILL HOLE FOR ENCLOSURE WIRE ENTRY. USE LIQUID-TIGHT FITTING.
2. REMOVE NYLON NUTS AND WASHERS. INSERT ER-600VC INTO ENCLOSURE. REPLACE NUTS AND WASHERS.
3. ATTACH GROUND WIRE FROM ENCLOSURE TO 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.
FIGURE 10. ER-600VC Installed in SE-MRE-600.
Page 15
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
RATINGS:
381.0
(15.00)
21.0
(0.83) ALTERNATE NEUTRAL CONNECTION
12.0
NEUTRAL CONNECTION
(0.47)
E R - 5 KV
S E NS IN G R E S I S TO R
2 0 KΩ
2500 VAC MAX
N
0.25-20 UNC
THREADED
INSERT
N
10-32 THREADED
INSERT
N
7.9
(0.31)
52.5
(2.07)
105.0
(4.13)
MAXIMUM VOLTAGE . 2,500 Vac
MAXIMUM CURRENT. 125 mA
RESISTANCE . . . . . . . 20 kΩ
THERMAL . . . . . . . . . . CONTINUOUS
TORQUE
TERMINAL N (3 LOCATIONS)
10-32 INSERT. . . . . 5.6 N-m (50 in-lb)
OTHERS . . . . . . . . . 9.0 N-m (80 in-lb)
TOP VIEW
316.0
(12.44)
188.0
(7.40)
0.25-20 UNC STUD
NOTE 2
RG
NOTES 5 & 6
SIDE VIEW
FRONT VIEW
NOTES:
MINIMUM DISTANCE
TO ADJACENT OBJECTS
NOTE 3
MINIMUM CLEARANCE FROM BASE
254.0 (10.00)
4. THIS DEVICE CAN DISSIPATE
300 WATTS. TO MINIMIZE SURFACE
TEMPERATURES FOR SYSTEMS
ALLOWED TO OPERATE
CONTINUOUSLY WITH A GROUND
FAULT, MOUNT VERTICALLY WITH
R & G TERMINALS DOWN.
355.6
5. ON REVISION 2 UNITS BASE IS
ELECTRICALLY CONNECTED TO
TERMINAL G THROUGH JUMPER
FROM TERMINAL G TO
SCREW.
THIS CONNECTION MAY BE
REMOVED FOR DIELECTRIC
STRENGTH TESTING. ENSURE
THAT THE JUMPER IS INSTALLED
AFTER TESTING.
6. ON REVISION 0 & 1 UNITS
SCREW
IS NOT PRESENT AND BASE IS
ELECTRICALLY CONNECTED TO
TERMINAL G.
7. CERTIFICATIONS NOT SHOWN.
FIGURE 11. ER-5KV Sensing Resistor.
50.7
(2.00)
(14.00)
457.0
(18.00)
MOUNTING DETAIL
254.0
(10.00)
3. MOUNTING SCREWS: M6 OR 0.25-20.
127.0
2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25.
(5.00)
1. DIMENSIONS IN MILLIMETRES (INCHES).
Page 16
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
RATINGS:
MAXIMUM VOLTAGE . 2,500 Vac
MAXIMUM CURRENT. 125 mA
RESISTANCE . . . . . . . 20 kΩ
THERMAL . . . . . . . . . . CONTINUOUS
TORQUE
TERMINAL N (3 LOCATIONS)
10-32 INSERT. . . . . 5.6 N-m (50 in-lb)
OTHERS . . . . . . . . . 9.0 N-m (80 in-lb)
ER-5WP
S E NS IN G R E S I S TO R
2 0 KΩ
2500 VAC MAX
N
0.25-20 UNC
THREADED
INSERT
N
10-32 THREADED
INSERT
N
7.9
(0.31)
52.5
(2.07)
105.0
(4.13)
381.0
(15.00)
21.0
(0.83) ALTERNATE NEUTRAL CONNECTION
12.0
NEUTRAL CONNECTION
(0.47)
TOP VIEW
316.0
(12.44)
188.0
(7.40)
0.25-20 UNC STUD
NOTE 2 AND 5
SIDE VIEW
FRONT VIEW
NOTES:
MINIMUM DISTANCE
TO ADJACENT OBJECTS
MINIMUM CLEARANCE FROM BASE
254.0 (10.00)
3. MOUNTING SCREWS: M6 OR 0.25-20.
4. THIS DEVICE CAN DISSIPATE
300 WATTS. TO MINIMIZE SURFACE
TEMPERATURES FOR SYSTEMS
ALLOWED TO OPERATE
CONTINUOUSLY WITH A GROUND
FAULT, MOUNT VERTICALLY WITH
R & G TERMINALS DOWN.
5. BASE IS ELECTRICALLY CONNECTED
TO TERMINAL G THROUGH JUMPER
FROM TERMINAL G TO SCREW.
THIS CONNECTION MAY BE
REMOVED FOR DIELECTRIC
STRENGTH TESTING. ENSURE THAT
THE JUMPER IS INSTALLED AFTER
TESTING.
6. CERTIFICATIONS NOT SHOWN.
FIGURE 12. ER-5WP Sensing Resistor.
355.6
50.7
(2.00)
(14.00)
457.0
(18.00)
MOUNTING DETAIL
(5.00)
NOTE 3
254.0
(10.00)
2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25
CABLE ACCESS OPENING IS 1/2 NPT.
USE A LIQUID-TIGHT FITTING FOR
CABLE ENTRY.
127.0
1. DIMENSIONS IN MILLIMETRES (INCHES).
Page 17
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
422.0
RATINGS:
E R - 1 5 KV
132.0
(5.20)
144.0
(5.67)
(16.61)
SENS IN G RESISTO R
R
1 0 0 KΩ
84 0 0 V A C M A X
1 M I N UT E M A X
N
G
MAXIMUM VOLTAGE . . 8,400 Vac
MAXIMUM CURRENT . 84 mA
RESISTANCE . . . . . . . . 100 kΩ
THERMAL
8,400 Vac . . . . . . . . . . 1 MINUTE ON,
120 MINUTES
OFF
1,900 Vac . . . . . . . . . . CONTINUOUS
NOTES 2 AND 4
0.25-20 BINDING HEAD
215.0
(8.46)
TOP
20.5
(0.81)
TORQUE
TERMINAL N . . . . . . . . 9.0 N-m (80 in-lb)
SIDE
FRONT
444.0
(17.50)
365.0
(14.37)
90.0
(3.53)
39.5
(1.56)
MINIMUM DISTANCE
TO ADJACENT OBJECTS
39.5
(1.56)
NOTES:
90.0
2. TERMINAL-BLOCK SCREWS:
6-32 x 0.25.
NOTE 3
MINIMUM CLEARANCE FROM BASE
305.0 (12.00)
3. MOUNTING SCREWS:
M6 OR 0.25-20.
4. USE LIQUID-TIGHT FITTING
FOR TERMINAL-BLOCKENCLOSURE CABLE ENTRY.
(3.53)
280.0
(11.00)
100.0
(3.94)
1. DIMENSIONS IN MILLIMETRES
(INCHES).
5. CERTIFICATIONS NOT SHOWN.
MOUNTING DETAIL
FIGURE 13. ER-15KV Sensing Resistor.
Page 18
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
780.0
(30.70)
100 K Ω
1 4,4 00 V A C MA X
1 M I N UT E MA X
R
N
0.25-20 BINDING HEAD
NOTES 2 AND 4
20.5
G
(0.81)
144.0
(5.67)
RATINGS:
E R - 2 5 KV
SE NS I NG R ES I ST OR
320.0
(12.60)
TOP
MAXIMUM VOLTAGE . 14,400 Vac
MAXIMUM CURRENT. 144 mA
RESISTANCE . . . . . . . 100 kΩ
THERMAL
14,400 Vac . . . . . . . . . 1 MINUTE ON,
120 MINUTES
OFF
2,500 Vac . . . . . . . . . CONTINUOUS
TORQUE
TERMINAL N . . . . . . . 9.0 N-m (80 in-lb)
FRONT
60.0
(2.40)
800.0
(31.50)
340.0
(13.38)
SIDE
340.0
(13.38)
217.0
(8.50)
534.0
(21.00)
100.0
(3.94)
NOTES:
1. DIMENSIONS IN
MILLIMETRES (INCHES).
NOTE 3
2. TERMINAL-BLOCK SCREWS:
6-32 x 0.25.
MINIMUM CLEARANCE FROM BASE
508.0 (20.00)
MINIMUM DISTANCE
TO ADJACENT OBJECTS
3. MOUNTING SCREWS:
M6 OR 0.25-20
4. USE LIQUID-TIGHT FITTING
FOR TERMINAL-BLOCKENCLOSURE CABLE ENTRY.
5. MOUNT AS SHOWN
WITH BASE HORIZONTAL.
6. CERTIFICATIONS NOT SHOWN.
MOUNTING DETAIL
FIGURE 14. ER-25KV Sensing Resistor.
Page 19
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
20.5
132.0
(5.20)
1000.0
(39.40)
E R - 3 5 KV
S E N SIN G R E SIS TO R
R
10 0 K Ω
22 , 2 0 0 V AC MA X
1 M I N UT E M AX
N
G
(0.81)
RATINGS:
MAXIMUM VOLTAGE . 22,000 Vac
MAXIMUM CURRENT . 220 mA
RESISTANCE . . . . . . . 100 kΩ
THERMAL
22,000 Vac . . . . . . . . . 1 MINUTE ON,
120 MINUTES
OFF
3,000 Vac . . . . . . . . . . CONTINUOUS
TORQUE
TERMINAL N . . . . . . . 9.0 N-m (80 in-lb)
0.25-20 BINDING HEAD
NOTES 2 AND 4
459.0
(18.10)
TOP
FRONT
SIDE
1600.0
(63.00)
MINIMUM CLEARANCE FROM BASE
685.0 (27.00)
100.0
(3.90)
400.0
(15.70)
400.0
(15.70)
NOTE 3
350.0
(13.80)
800.0
(31.50)
350.0
(13.80)
MINIMUM DISTANCE
TO ADJACENT OBJECTS
MOUNTING DETAIL
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. TERMINAL-BLOCK SCREWS: 6-32 x 0.25.
3. MOUNTING SCREWS: M6 OR 0.25-20.
4. USE LIQUID-TIGHT FITTING FOR
TERMINAL-BLOCK-ENCLOSURE CABLE ENTRY.
5. MOUNT AS SHOWN WITH BASE HORIZONTAL.
6. CERTIFICATIONS NOT SHOWN.
FIGURE 15. ER-35KV Sensing Resistor.
SE-330 Neutral-Grounding-Resistor Monitor
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-throughcurrent rating. This provides an appropriate GF TRIP
LEVEL setting range and analog-output scaling. See
Sections 2.1.2 and 2.9.
Outline and mounting details for the EFCT- and
SE-CS30-series current sensors are shown in Figs. 16,
17, and 18. 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 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, decreases below 5% of its current rating. CTprimary current-injection testing is recommended to
verify
trip
levels
below
5%
of
the
CT-primary rating. See Section 9.4. Littelfuse Startco
current sensors 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 20
Rev. 10-K-090815
Page 21
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M4 OR 8-32.
3. PRESS MOUNTING FEET IN PLACE USING
INSTALLATION TOOL PROVIDED.
4. RoHS COMPLIANT.
5. EN 60044-1 COMPLIANT.
121.0
(4.76)
121.0
(4.76)
20.5
(0.81)
56.0
(2.21)
46.0
(1.81)
30.0
(1.18)
80.0
(3.15)
NOTE 2
M5 SCREWS
TOP
MOUNTING DETAIL
25.0
(0.98)
30.0
(1.18)
EFCT-1 EARTH FA ULT CT
600 V CLASS, INSULATION CLASS A
R
R
LR 53428
5.0 (0.20) Ø
RECESSED FOR
8-mm HEX NUT
1.0 (0.04) DEEP
22.0
(0.87)
EFCT - 1FC
FLUX
CONDITIONER
(OPTIONAL)
.0
82 23)
.
3
(
69.
(2.7 8
5)
126.0
(4.96)
US
(5.43)
138.0 MAX
C
5.5
(0.22)
110.0
(4.33)
FRONT
FIGURE 16. EFCT-1 Ground-Fault Current Sensor.
5.5
(0.22)
56.0
(2.21)
SIDE
Page 22
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
121.0
(4.76)
121.0
(4.76)
20.5
80.0
(3.15)
56.0
(2.21)
46.0
(1.81)
30.0
(1.18)
(0.81)
NOTE 3
M5 SCREWS
TOP
MOUNTING DETAIL
25.0
(0.98)
(1.18)
30.0
SE-CS30-70
CURRENT SENSOR
R
R
LR 53428
22.0
Ø 5.0 (0.20)
RECESSED FOR
8-mm HEX NUT
1.0 (0.04) DEEP
5.5
110.0
5.5
(0.22)
(4.33)
(0.22)
56.0
(2.21)
SIDE
FRONT
MOUNTING FOOT
INSTALLATION
TOOL
126.0
69.
8
(2.7
5)
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. PRESS MOUNTING FEET IN PLACE USING
INSTALLATION TOOL PROVIDED (DETAIL ‘A’).
3. MOUNTING SCREWS: M4 OR 8-32.
DETAIL ‘A’
FIGURE 17. SE-CS30-70 Ground-Fault Current Sensor.
(4.96)
US
(0.87)
(5.43)
138.0 MAX
C
4. RoHS COMPLIANT.
5. EN 60044-1 COMPLIANT.
Page 23
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
68.0
(2.68)
34.0
(1.34)
68.0
(2.68)
M4 OR 8-32 TAP
26.5
(1.04)
52.5
(2.07)
42.6
(1.68)
17.0
(0.67)
MOUNTING DETAIL
TOP
(0.43)
110.0 MAX
M5 SCREWS
25.0
(0.98)
26.5
(1.04)
SE-CS30-26
CURRENT SENSOR
R
R
LR 53428
US
4.0 (0.16) Ø
0
6.
2)
.0
(1
7.0
2
RECESSED FOR
7-mm HEX NUT
3.0 (0.12) DEEP
58.0
(2.28)
(0.87)
34.0
(1.34)
72.0
(2.83)
C
5.0
(0.20)
5.0
(0.20)
52.5
(2.07)
FRONT
SIDE
NOTES:
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. PRESS MOUNTING FEET IN PLACE USING
INSTALLATION TOOL PROVIDED (DETAIL ‘A’).
MOUNTING FOOT
INSTALLA TION
TOOL
3. MOUNTING SCREWS: M4 OR 8-32.
4. RoHS COMPLIANT.
5. EN 60044-1 COMPLIANT.
DETAIL ‘A’
6. SE-CS30-26 SHOWN.
FIGURE 18. EFCT-26 and SE-CS30-26 Ground-Fault Current Sensors.
Page 24
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
30.0
(1.18)
RESISTOR FAULT
GROUND FAULT
LEGEND
PLATE
NOTE 4
(0.59)
X1
X2
22.5
(0.89)
15.0
43.5
(1.71)
25.0
(0.98)
RESET
22.2 (0.87) DIA
17.3
(0.68)
29.9
(1.17)
36.6
(1.44)
NOTES:
LEGEND PLATES
1. TWO RED LED LIGHTS
24-120 VAC/DC, NOT POLARITY
SENSITIVE.
36.6
(1.44)
30.0 MINIMUM
(1.18)
29.9
(1.17)
MOUNTING DETAIL
PUSH BUTTON
2. YELLOW PUSH BUTTON
3 A @ 240 VAC - A600,
0.5 A @ 125 VDC - Q600.
(1.57)
40.0 MINIMUM
43.5
14.9
(0.59)
(1.71)
PILOT LIGHTS
3. DIMENSIONS IN MILLIMETRES
(INCHES).
4. ----- INDICATES CLEARANCE
REQUIRED.
5. PANEL THICKNESS 1.0 TO 6.0
(0.04 TO 0.24).
6. NEMA 4X.
FIGURE 19. RK-332 Remote Indication and Reset.
67.5
(2.657)
67.5
(2.657)
48.0
(1.890)
66.0
(2.598)
R1.25(0.049)
MAXIMUM
TOP
MOUNTING CUTOUT
100
60
40
®
20
65.0
(2.559)
80
1. DIMENSIONS IN MILLIMETRES (INCHES).
71.0
(2.795)
%
NOTES:
0
PGA-0520
ANALOG % CURRENT METER
FRONT
FIGURE 20. PGA-0520 Analog Percent Current Meter.
SIDE
REAR
Page 25
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
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, the SE-330 will be
exposed to the GPR. If the GPR is greater than the
terminal-block rating, 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 which allows an SE-330 to be
connected to station ground is shown in Fig. 21. 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.
TO SENSING
RESISTOR
TERMINAL N
NEUTRAL
NOTE 1
NGR
L
22
23
K1
16
SE-330
PULSE
17 ENABLE
C
N
NOTE 2
NOTES:
1. ALTERNATE NGR CONFIGURATION.
2. SET SWITCH S1 TO K1 = PULSING.
FIGURE 22. Simplified Pulsing Connection.
NEUTRAL
ER-SERIES N
SENSING
RESISTOR
STATION
TRIP CIRCUIT
22
NGR
23
R
STATION
CONTROL
SUPPLY
1
2
K1
L1
R
L2/N
G
G
6
7
SE-330
3
STATION GROUND BUS
STATION
GROUND BED
ISOLATED
GROUND BED
REMOTE GROUND
FIGURE 21. Simplified Isolated-Ground Connection.
3.5 PULSING CONNECTION
Set switch S1 to K1 = PULSING and use an external
switch as shown in Fig. 22 to use relay K1 to control a
pulsing contactor. Relays K2 and K3 can be used for
tripping and can be configured in the fail-safe or nonfail-safe mode using the SE-MON330 software.
SE-330 Neutral-Grounding-Resistor Monitor
4. DATA INTERFACES
4.1 SD CARD
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
long-term data logging of measured values and for
firmware upgrades.
4.1.1 DATALOGGING
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).
The log is updated every two seconds and it includes
measured values, configuration parameters, and trip
status. A new log file is created at the start of each day.
If previous log files exist and the microSD™ card has
less than 20 MB of free space, the oldest datalogging file
will automatically be deleted before a new file is created.
The red DIAGNOSTIC LED may indicate an SD Card
error. See Section 5. Approximately 3 GB of data is
generated per year of logging.
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 s of card installation. If S8 is
switched to UPGRADE after 30 s, 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.
Ensure that the DIAGNOSTIC LED is off before
beginning the firmware upgrade process.
The red DIAGNOSTIC LED blinks rapidly while the
firmware upgrade is running and the SE-330 will restart
when the upgrade is complete. If the upgrade is not
successful, the DIAGNOSTIC LED will indicate an SD
Upgrade Error. See Section 5. Set switch S8 back to
RUN for normal operation. If a firmware upgrade fails,
the existing firmware is not overwritten.
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.
NOTE: 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.
NOTE: The maximum recommended microSD™ card
storage capacity is 4 GB.
Page 26
Rev. 10-K-090815
4.2 USB INTERFACE
Use the SE-MON330 software (version 3.5 or newer)
to access set-points, measured values, and trip records
through the mini B USB interface located on the front
panel. The following data can be viewed:
 Front-panel and configuration-switch settings
 Neutral voltage and neutral current
 Resistance change from the calibrated value
 Trip status
 Trip records, 100 date and time stamped
 Firmware version and serial number
The following values can be viewed and adjusted:
 Ground-fault trip setting (when front-panel GF Trip
Level is set to MEM)
 K2 ground-fault relay output operating mode
 K3 resistor-fault relay output operating mode
 Clock settings
 Trip records can be cleared
 Remote calibration
 Resistor-fault trip time
 Resistor-fault trip level
 Geo-magnetic filter
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.
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 over 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)
Refer to the appropriate SE-330 communicationsinterface manual for details.
(1)
Uses the plug-in style SC connector.
Page 27
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
5. TROUBLESHOOTING
PROBLEM
DIAGNOSTIC LED
FLASH CODE(1)
POWER LED off.
POWER LED flashes.
Calibration-Error Trip
DIAGNOSTIC LED flash code
1L-1S-1L
Remote Trip
DIAGNOSTIC LED flash code
1L-2S-1L
A/D-Converter-Error Trip
DIAGNOSTIC LED flash code
1L-4S-1L
SD Card
DIAGNOSTIC LED flash code
1L-5S-1L
Watchdog Trip
DIAGNOSTIC LED flash code
1L-6S-1L
CPU Trip
DIAGNOSTIC LED flash code
1L-7S-1L
Non-Volatile Memory Error Trip
DIAGNOSTIC LED flash code
1L-8S-1L
SD Upgrade Error
DIAGNOSTIC LED flash code
1L-9S-1L
DIAGNOSTIC LED = Solid Red
Pressing RESET does not clear trips.
UNIT HEALTHY relay K4 momentarily
changes state.
SOLUTION
Check if supply voltage is present on terminals 1 and 2. If present,
an overvoltage may have caused the power supply to shutdown.
Cycle supply voltage. If POWER LED remains off, return unit for
repair.
A power-supply overload has occurred. Cycle supply voltage. If
problem persists, consult Littelfuse Startco.
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.
GF LED(2): No Change, RF LED(2): ON, K1:Trip
The SE-330 was tripped by a signal from network communications.
Press RESET to clear the trip.
GF LED(2): ON, RF LED(2): ON, K1:Trip
An A/D-converter error was detected. Press RESET to clear the
trip. If the problem persists, consult Littelfuse Startco.
GF LED(2): No Change, RF LED(2): ON, K1:Trip
SD Card is full or a write error occurred. Delete files or use a
different microSD™ card.
GF LED(2): No Change, RF LED(2): No Change, K1:No Change
If this diagnostic was caused during an attempt to upgrade the
firmware, follow this alternate 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 s
- the upgrade should continue as described in Section 4.1.2
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 Startco.
GF LED(2): ON, RF LED(2): ON, K1:Trip
The CPU has detected a system fault. Press RESET to clear the
trip.
GF LED(2): ON, RF LED(2): ON, K1:Trip
An error was detected in the Non-Volatile Memory. Press RESET
to clear the trip. If the problem persists, consult Littelfuse Startco.
GF LED(2): ON, RF LED(2): ON, K1:Trip
An error occurred during the flash-memory upgrade procedure.
Ensure that the firmware upgrade file is correct or use a different
microSD™ card.
GF LED(2): No Change, RF LED(2): No Change, K1:No Change
SE-330 processor failed to start. Cycle supply. If problem persists,
consult Littelfuse Startco. K1: De-energized.
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.
Occurs when processor is reset.
Page 28
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
PROBLEM
No analog-output current.
DIAGNOSTIC LED
FLASH CODE(1)
SOLUTION
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.
SE-330 Neutral-Grounding-Resistor Monitor
6. TECHNICAL SPECIFICATIONS
6.1 SE-330
Supply:
Option 0 .............................. 30 VA, 120 to 240 Vac
(+10, -45%), 50/60 Hz;
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
AC Measurements .................... Discrete Fourier
Transform. 16 samples
per cycle, 50 or 60 Hz
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;
2,000 Vac
ER-15KV to ER-35KV .....100; 300; 500; 650; 850;
1,000; 1,700; 4,000; 6,000;
8,500; 10,000 Vac
Accuracy .............................10% of setting
3 dB Frequency Response:
S6 = 50 Hz .......................25 to 85 Hz
S6 = 60 Hz .......................30 to 90 Hz
NGR Calibration Range:
ER-600VC, ER-5KV, or
ER-5WP ..............................0 to 2 k
ER-15KV to ER-35KV ......0 to 10 k
Trip Resistance, VN = 0:
ER-600VC, ER-5KV, or
ER-5WP:
Range(5) ............................250 to 750- change
± 200 
Default .............................500- change
ER-15KV to ER-35KV:
Range(5) ............................1.25 to 3.75-k change
± 1 k
Default .............................2.5-k 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
Ground-Fault Circuit:
Trip Level ..............................2, 4, 6, 8, 10, 20, 40, 60,
80, 100% of CT-Primary
Rating or 2 to 100% using
MEM parameter
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
Page 29
Rev. 10-K-090815
Trip-Level Accuracy ............. Maximum of 1% of CTPrimary Rating or 3% of
Setting(2)
Trip-Time Accuracy ............. 10% of Setting, 20 ms
minimum
3 dB Frequency Response:
S6 = 50 Hz .......................... 25 to 85 Hz
S6 = 60 Hz .......................... 30 to 90 Hz
Maximum CT lead resistance:
EFCT & SE-CS30.............. 5 
Other CT’s .......................... Consult CT Curve.
CT-Input Burden:
5-A Input ............................ < 0.01 
1-A Input ............................ < 0.05 
EFCT Input......................... < 10 
Thermal Withstand:
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 Rating
Trip Mode.............................. Latching/Non-Latching
Pulsing Circuit:
Pulse Period ........................... 1.0 to 3.0 s,
0.2-s increments
Duty Cycle............................. 50%
Time Accuracy ...................... 10% of Setting
Trip/Pulsing Relay K1 Contacts:
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:
dc....................................... 75 W resistive,
35 W inductive
(L/R = 0.04 s)
ac ....................................... 2,000 VA resistive,
1,500 VA inductive
(PF = 0.4)
Subject to maximums of 8 A at 250 Vac, 5 A resistive
at 30 Vdc, and 0.4 A resistive at 250 Vdc.
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
Supplemental Contact Ratings:
Make/Carry 0.2s ................. 20 A
Break:
dc....................................... 50 W resistive, 25 W
inductive (L/R = 0.04 s)
SE-330 Neutral-Grounding-Resistor Monitor
ac .......................................2,000 VA resistive, 1,500
VA inductive (PF = 0.4)
Subject to maximums of 8 A at 250 Vac, 8 A resistive
at 30 Vdc, and 0.4 A resistive at 150 Vdc.
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 
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 
Auto-reset time ............................2.8 s maximum
4-20-mA Analog Output:
Type .......................................Self Powered and
Loop Powered
Range .....................................4 to 22 mA
Loop Voltage .........................8 to 36 Vdc
Load .......................................500  (maximum with
24-Vdc supply)
Isolation .................................120 Vac
Parameter ...............................NGR Current, 20 mA =
CT Primary Current
USB Communications:
Baud Rate ..............................12 Mbit/s
Protocol ..................................USB Device
Connector...............................Mini B
SD Memory Card:
Type .......................................Standard Grade
Form Factor ...........................microSD™(3)
Format ....................................FAT32
Capacity .................................512 MB to 4 GB
(microSD™ and
microSDHC™)
Operating Temperature:
Standard Grade
(Included)............................-25 to 85°C (-13 to 140°F)
Industrial Grade ..................-40 to 85°C (-40 to 140°F)
Terminal-Block Ratings ..............10 A, 300 Vac, 12 AWG
(2.5 mm2)
PWB Conformal Coating ............MIL-1-46058 qualified,
UL QMJU2 recognized
Mounting Configurations ............Panel Mount and Optional
Surface Mount
Dimensions:
Height ......................................213 mm (8.4”)
Width .......................................99 mm (3.9”)
Page 30
Rev. 10-K-090815
Depth ....................................... 132 mm (5.2”)
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
Surge Withstand .......................... ANSI/IEEE C37.90.11989 (Oscillatory and Fast
Transient)
EMC Tests:
Verification tested in accordance with EN 60255-26:2013.
Radiated and Conducted
Emissions ........................... CISPR 11:2009,
CISPR 22:2008,
EN 55022:2010
Class A
Current Harmonics and
Voltage Fluctuations .......... IEC 61000-3-2
and IEC 61000-3-3
Class A
Electrostatic Discharge ....... IEC 61000-4-2
± 6 kV contact discharge
(direct and indirect)
± 8 kV air discharge
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)
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
Conducted RF Immunity .... IEC 61000-4-6
10 V, 0.15-80 MHz,
80% AM (1 kHz)
Magnetic Field
Immunity ............................ IEC 61000-4-8
50 Hz and 60 Hz
30 A/m and 300 A/m
SE-330 Neutral-Grounding-Resistor Monitor
Power Frequency(4) ............. IEC 61000-4-16
Zone A: differential mode
100 Vrms
Zone A: common mode
300 Vrms
1 MHz Burst ....................... IEC 61000-4-18
± 1 kV differential mode
(line-to-line)
± 2.5 kV common mode
Voltage Interruption ........... IEC 61000-4-11,
IEC 61000-4-29
0% for 10, 20, 30,
50 ms (dc)
0% for 0.5, 1, 2.5,
5 cycles (60 Hz)
IEC 61000-4-17
Level 4, 15% of rated dc
value
Certification .................................CSA, Canada and USA
R
C
LR 53428
US
UL Listed
Australia
N11659
CE, European Union
FCC
To:CSA C22.2 No. 14 Industrial Control Equipment
UL 508 Industrial Control Equipment
UL 1053 Ground Fault Sensing and Relaying
Equipment
CE Low Voltage Directive
IEC 61010-1:2010 (3rd Edition)
FCC CFR47, Part 15, Subpart B,
Class A – Unintentional Radiators
Compliance .............................. RoHS Pending
NOTES:
(1)
See sensing resistor specifications for applicable voltage
limits.
(2)
Accuracy included for EFCT-x and SE-CS30-x current
sensors only.
(3)
microSD™ and microSDHC™ are trademarks of
SD-3C, LLC.
(4)
Remote-reset and pulse-enable wiring is limited to
10 m (32’).
(5)
This value can only be modified using SE-MON330
software. See Section 4.2.
Page 31
Rev. 10-K-090815
6.2 SENSING RESISTORS
Environment:
Operating Temperature ......... -40 to 60°C (-40 to 140°F)
Storage Temperature ............. -55 to 80°C (-67 to 176°F)
Extended Operating
Temperature .......................... -55 to 60°C (-67 to
140°F)(1)
ER-600VC:
Maximum Voltage .............. 600 Vac
Maximum Current .............. 30 mA
Resistance ........................... 20 k
Thermal:
420 Vac............................ Continuous
600 Vac............................ 6 minutes on,
60 minutes off
Shipping Weight ................... 300 g (0.7 lb)
ER-5KV:
Maximum Voltage .............. 2,500 Vac
Maximum Current .............. 125 mA
Resistance ........................... 20 k
Thermal ................................. Continuous
Torque:
Terminal N:
10-32 Insert ..................... 5.6 N-m (50 in-lb)
Others .............................. 9.0 N-m (80 in-lb)
Shipping Weight ................... 5.0 kg (11 lb)
ER-5WP:
Maximum Voltage .............. 2,500 Vac
Maximum Current .............. 125 mA
Resistance ........................... 20 k
Thermal ................................. Continuous
Torque:
Terminal N:
10-32 Insert ..................... 5.6 N-m (50 in-lb)
Others .............................. 9.0 N-m (80 in-lb)
Shipping Weight ................... 5.0 kg (11 lb)
ER-15KV:
Maximum Voltage .............. 8,400 Vac
Maximum Current .............. 84 mA
Resistance ........................... 100 k
Thermal:
8,400 Vac............................ 1 minute on,
120 minutes off
1,900 Vac............................ Continuous
Torque (Terminal N)............. 9.0 N-m (80 in-lb)
Shipping Weight ................... 5.0 kg (11 lb)
SE-330 Neutral-Grounding-Resistor Monitor
ER-25KV:
Maximum Voltage .............. 14,400 Vac
Maximum Current .............. 144 mA
Resistance ........................... 100 k
Thermal:
14,400 Vac ..........................1 minute on,
120 minutes off
2,500 Vac ............................Continuous
Torque (Terminal N) .............9.0 N-m (80 in-lb)
Shipping Weight....................20 kg (44 lb)
ER-35KV:
Maximum Voltage .............. 22,000 Vac
Maximum Current .............. 220 mA
Resistance ........................... 100 k
Thermal:
22,000 Vac ..........................1 minute on,
120 minutes off
3,000 Vac ............................Continuous
Torque (Terminal N) .............9.0 N-m (80 in-lb)
Shipping Weight....................40 kg (88 lb)
Certification.............................. CSA, Canada and USA
R
C
LR 53428
US
UL Listed
CE, European Union
NOTES:
(1)
Electrical specifications have been verified at a
Littelfuse lab.
6.3 CURRENT SENSORS
Environment:
Operating Temperature .........-40 to 60°C (-40 to 140°F)
Storage Temperature .............-55 to 80°C (-67 to 176°F)
EFCT-1:
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
Temperature...........................-55 to 60°C (-67 to
140°F)(1)
Supplemental
Specifications:
Trip Level Accuracy:
≤ 1 A ..........................1% of CT-Primary Rating
> 1 A ..........................3% of CT-Primary Rating
Page 32
Rev. 10-K-090815
EFCT-26:
Current Ratio....................... 5:0.05 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:
≤ 1 A ..........................1% of CT-Primary Rating
> 1 A ..........................3% of CT-Primary Rating
SE-CS10-2.5:
Current Ratio....................... 1,000:5 A
Insulation ............................ 600-V Class
Window Diameter ............... 63 mm (2.5”)
Shipping Weight ................. 0.7 kg (1.5 lb)
Certifications ....................... CE
Compliance ......................... IEC 60044-1
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)
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
Temperature ...........................-55 to 60°C (-67 to
140°F)(1)
CT200:
Current Ratio....................... 200:5 A
Insulation ............................ 600-V Class
Window Diameter ............... 56 mm (2.2”)
Shipping Weight ................. 1 kg (2.2 lb)
Certifications ....................... CSA, UL
Compliance ......................... RoHS
Extended Operating
Temperature ...........................-55 to 60°C (-67 to
140°F)(1)
NOTES:
(1)
Electrical specifications have been verified at a
Littelfuse lab.
SE-330 Neutral-Grounding-Resistor Monitor
7. ORDERING INFORMATION
SE-330-
-
K4 Contact:
0 N.O. UNIT HEALTHY Contact
1 N.C. UNIT HEALTHY Contact
Options:
0 No Options
Network Communications:(1)
0 None
1 DeviceNet™
3 Ethernet (Dual RJ45)
4 Ethernet (SC Fiber & RJ45)
5 Ethernet (Dual SC Fiber)
6 IEC 61850 (Dual RJ45)
7 IEC 61850 (SC Fiber & RJ45)
8 IEC 61850 (Dual SC Fiber)
Supply:
0 Universal ac/dc Supply
2 48 Vdc Supply
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.
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
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
Current Sensors:
EFCT-1 ..................................Current Sensor,
5-A-primary rating,
82-mm (3.2”) Window,
6 m (19.5’) of 22 AWG
(3.3 mm2) shielded cable
included
EFCT-26 ................................Current Sensor,
5-A-primary rating,
26-mm (1.0”) Window,
6 m (19.5’) of 22 AWG
(3.3 mm2) shielded cable
included
SE-CS10-2.5 ....................... Current Sensor, 30-Aprimary rating, 63 mm
(2.5”) window
Page 33
Rev. 10-K-090815
SE-CS30-26 ........................ Current Sensor,
30-A-primary rating,
26-mm (1.0”) window
SE-CS30-70 ...........................Current Sensor,
30-A-primary rating,
70-mm (2.7”) window
CT200 ................................. Current Sensor,
200-A-primary rating,
56-mm (2.2”) window
5SHT-101-E...........................Current Sensor,
100-A-primary rating,
40-mm (1.6”) window
5SHT-151-E...........................Current Sensor,
150-A-primary rating,
40-mm (1.6”) window
5SHT-500-E...........................Current Sensor,
50-A-primary rating,
40-mm (1.6”) window
7SHT-301-E...........................Current Sensor,
300-A-primary rating,
64-mm (2.5”) window
7SHT-401-E...........................Current Sensor,
400-A-primary rating,
64-mm (2.5”) window
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
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
Software:(2)
SE-MON330 Software........... SE-330 Data-Display
Program for PC, version
3.5 or newer
NGR Monitor
Set-Point Assistant ................. Setting Guide
NOTES:
(1)
Profibus models only available on legacy SE-330.
(2)
Available at www.littelfuse.com/relayscontrols.
SE-330 Neutral-Grounding-Resistor Monitor
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.
Littelfuse Startco will (at Littelfuse Startco’s option)
repair, replace, or refund the original purchase price of
an SE-330 that is determined by Littelfuse Startco to be
defective if it is returned to Littelfuse Startco, 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 Startco does not warrant
products repaired or modified by non-Littelfuse Startco
personnel.
9. TEST PROCEDURES
NOTE: Ensure the real-time clock is set. See Section 4.2.
9.1 RESISTOR-FAULT TESTS
Perform tests with system de-energized and supply
voltage applied to the SE-330.
9.1.1 CALIBRATION AND OPEN TEST
Test Equipment: 20-k and 100-k, 1/4-watt, 1%
calibration resistors (calibration resistors
are supplied with SE-330).
Procedure:
 Remove connections to terminals 6 and 7.
 Connect the 20-k resistor to terminals 6 and 7.
 Set switch S5 to the 20-k position.
 Perform calibration as per Section 2.2.
 The CALIBRATED LED should be on.
 Press RESET.
 Remove the 20-k resistor and wait for the resistor-fault
trip time.
PASS: The SE-330 should trip on resistor fault.
 Connect the 100-k resistor to terminals 6 and 7.
 Set switch S5 to the 100-k position.
 Perform calibration as per Section 2.2.
The CALIBRATED LED should be on.
 Press RESET.
 Remove the 100-k resistor and wait for the resistorfault trip time.
PASS: The SE-330 should trip on resistor fault.
NOTE: Resistor-fault-trip reset can take up to one
second.
9.1.2 VOLTAGE TEST
Test Equipment: 0 to 120 Vac voltage source, multimeter,
and ER sensing resistor.
Page 34
Rev. 10-K-090815
NOTE: Use an isolation transformer if the test-voltage source
does not provide dc continuity for the SE-330 resistancemeasuring circuit.
NOTE: Applying the test voltage to the R and G terminals
will damage the SE-330 and the ER sensing resistor. The VN
TRIP LEVEL is the trip voltage at terminal N, not terminal R.
Procedure:
 Connect the ER sensing resistor to the SE-330 and
calibrate the SE-330.
 Disconnect the wire from sensing-resistor terminal N. A
resistor-fault trip will occur.
 Set the voltage source to 0 V.
 Connect the voltage source between sensing resistor N
and G terminals.
 Set the VN TRIP LEVEL (VAC) to 20.
 Press RESET.
 The RESISTOR FAULT TRIP LED should be off.
 Increase the test voltage to 25 Vac for 20-k sensors or
120 Vac for 100-k sensors and wait for the resistorfault 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:
 Disconnect the sensing resistor.
 Measure the resistance between sensing-resistor terminals
R and N.
PASS: Resistance should be between 19.6 and 20.4 k
for 20-k sensing resistors. Resistance should be
between 98 and 102 k for 100-k sensing resistors.
 Measure the resistance between sensing-resistor terminals
R and G in both directions.
PASS: Resistance should be greater than 10 M in
both directions.
9.3 ANALOG-OUTPUT TEST
Test Equipment: Multimeter with a mAdc scale.
Procedure:
 Connect the 4–20-mA output as a self-powered output as
shown in 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 CTprimary current is equal to the CT-primary rating.
Page 35
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
9.4 GROUND-FAULT PERFORMANCE TEST
To meet the requirements of the National Electrical
Code (NEC), as applicable, the overall ground-fault
protection system requires a performance test when first
installed. A written record of the performance test is to
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 provided 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:
a) USING SE-400
NEUTRAL
TO SE-330
TO SENSING
RESISTOR
TERMINAL N
3
5
N
8
REMOTE
INPUT
9
OP2
OP1
12
L1
L2
1
SE-400
RMT1
RMT2
b) USING SE-100T
NEUTRAL
TO SE-330
TO SENSING
RESISTOR
TERMINAL N
c) 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.
d) 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 CT’s). Fig. 23a 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. 23b 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 2.0A 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.
11
L
a) Evaluate the interconnected system in accordance
with the overall equipment manufacturer’s detailed
instructions.
b) Verify proper installation of the ground-fault current
sensor. Ensure the cables pass through the groundfault-current-sensor window. This check can be done
visually with knowledge of the circuit.
The
connection of the current-sensor secondary to the
SE-330 is not polarity sensitive.
NGR
NGR
C
LO
L
L1
HI
N
L2
REMOTE
TEST
0.65 A
2.75 A
SE-100T
RMT
FIGURE 23. Ground-Fault-Test Circuits.
TABLE 3. GROUND-FAULT-TEST RECORD
DATE
TEST RESULTS
e) Record the date and the results of the test on the
attached test-record form.
NOTE: Do not inject test current directly into CT-input
terminals 8, 9, 10, and 11.
Retain this record for the authority having jurisdiction.
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.
SE-330 Neutral-Grounding-Resistor Monitor
MANUAL
RELEASE DATE
APPENDIX A
SE-330 REVISION HISTORY
HARDWARE REVISION
MANUAL
(REVISION NUMBER
REVISION
ON PRODUCT LABEL)
September 8, 2015
10-K-090815
June 22, 2015
10-J-062215
May 20, 2015
10-I-052015
March 3, 2015
10-H-030315
July 7, 2014
10-G-070714
14
April 14, 2014
10-F-041414
13
January 8, 2014
10-E-010814
November 29, 2013
10-D-112913
October 8, 2013
10-C-100813
September 12, 2013
10-B-091213
August 30, 2013
10-A-083013
MANUAL REVISION HISTORY
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 yearly 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 updated.
REVISION 10-G-070714
SECTION 6
Added CE, C-Tick, and FCC information.
REVISION 10-F-041414
APPENDIX A
Hardware revision updated.
Page 36
Rev. 10-K-090815
FIRMWARE REVISION
2.52
15
2.50
2.40
12
2.31
2.30
2.20
11
2.10
10A
2.08
2.07
10
2.07
SE-330 Neutral-Grounding-Resistor Monitor
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.
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 is now listed as an accessory only.
APPENDIX A
Added revision history.
Page 37
Rev. 10-K-090815
SE-330 Neutral-Grounding-Resistor Monitor
Page 38
Rev. 10-K-090815
HARDWARE REVISION HISTORY
HARDWARE REVISION 15
RTC circuit updated.
HARDWARE REVISION 14
Added CE and C-Tick compliance.
HARDWARE REVISION 13
Reduced ESD sensitivity of front-panel dials.
HARDWARE REVISION 12
Improved Fiber Ethernet support.
HARDWARE REVISION 11
Reduced ESD sensitivity of USB and SD card connectors.
HARDWARE REVISION 10A
Update to RTC circuit.
HARDWARE REVISION 10
Updated SE-330 platform to include USB and microSD™ interfaces, programmable trip level (MEM) feature, and
ability to add future options.
Real-time clock added.
Added dual cable and fiber Ethernet ports.
FIRMWARE REVISION HISTORY
FIRMWARE REVISION 2.52
Improved compatibility with Internet Explorer™ web browser.
FIRMWARE REVISION 2.50
Added support for adjustable resistor-fault trip level.
Web page functionality re-enabled for Ethernet options.
FIRMWARE REVISION 2.40
Added support for geo-magnetic filter.
Added support for 12 to 60 s resistor-fault trip time.
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.