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GE
Interlocking” for coordination of single or
Integral test panel with Push To Test and
Energy Connections
Model BGFL (Relay)
Ground Fault Current Detection Systems
Trip Currents 5- 60, 30- 360, or 100 -1200 A
Operating Range
Trip currents of 5-60, 30-360,
or 100-1200 A.
Time delay from 0.10 to 1 second.
(Adjustable)
Nominal Input Voltages
120 Volts ac, 125 Volts dc, 24 Volts dc,
48 Volts dc
Input Power
2 VA plus shunt coil requirements. Rated
@ 120 Vac.
Input Withstand
200,000 Amp. RMS for 3 cycles, 50/60 Hz
How to Order Relays
Internal Circuit Options
4 = Isolated Inernal "Form C"*
7 = With Zone Interlocking
9 = Without Zone Interlocking
Frequency
50/60 Hz.
Ambient Temperature Range
-30°C to +60°C
Only for use with GFL sensors.
Approximate weight 1.5 lbs
These Class 1 Model BGFL Ground Fault
Relays and Sensors are designed to form
a system for detecting a ground
fault current on a ground ac power
system. When a ground fault exceeds a
pre-selected Current level and Time Delay
setting, the relay initiates a trip signal for
a shunt trip disconnect device to open
and clear the fault. This BGFL system
is designed to provide protection for
electrical equipment, not protection for
personnel.
Meets NEC service entrance equipment
standards.
Available in three basic styles,
“Standard”, “Form C”, or “Zone
multiple ground fault devices in system.
Shunt Trip Bypass pushing for ease in
proper operational testing of the
system, with or without tripping the
protective device.
“Power On” LED indicator in cover.
Positive visual trip indicator, manual
reset.
Infinitely adjustable Time Delay.
Discrete current threshold adjustment.
Panel or door mounting.
Rear terminal kit and clear plastic cover
standard with door mounting.
Electromechanical relay output, positive
“ON” and “OFF”.
Operates with molded case and power
circuit breakers, bolted pressure
switches, fusible disconnect switches.
* Not available with zone interlocking option
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BGFL Current Detection Systems Ground Fault
Ground Fault Current Detection Systems Model BGFL (Outlines)
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Model GFL (Sensor)
Ground Fault Current Detection Systems
Trip Currents 5- 60, 30- 360, or 100 -1200A
Operating Range
Trip currents from 5- 60,
30-360, or 100-1200A.
Trip current tolerance ± 15 percent.
Frequency
50/60 Hz.
Insulation Level
600 Volt, 10 kV BIL full wave.
Terminals are brass studs No. 8-32.
Only for use with BGFL relays.
BGFL Current Detection Systems Ground Fault
Toroidal Sensors
Ground Fault Current Sensors, type GFL, are available in three
different styles, a variety of sizes and current ranges - to match
the BGFL relay ranges. The physical size of the sensor window
should be carefully determined by the physical size and
configuration of the power conductors. The Ground Fault Sensor
will respond only to ground faults which occur between the
position of the sensor and the load. Each sensor has two sets of
windings one for test and one for normal operation.
* The Model GFL156T-1, GFL156T-3, GFL250T-1, and GFL250T-3 have molded
mounting feet.
** The Models GFL425T-1, GFL425T-2, and GFL425T-3 have no top mounting holes.
Order the following mounting bracket kits:
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BGFL Current Detection Systems Ground Fault
available as a split core (take-apart) style for assembly to existing
Proper safety precautions must be followed during installation by
Model GFL (Sensor)
Ground Fault Current Detection Systems
Trip Currents 5- 60, 30- 360, or 100 -1200A
Rectangular sensors are available for the following trip currents:
5-60A, 30-360A and 100-1200A. The table above lists the
available sensors sizes. Any window width (A1) may be combined
with any window length. (B1) Rectangular sensors are also
electrical installation without the need for dismantling the
primary bus or cables.
Caution:
a trained electrician. It is recommended that the incoming power
de-energized before installation. The sensor must have its
secondary terminals short circuited or the relay connected,
before energizing the primary circuit.
How to Order Rectangular Sensors
Dimension B1
Window length in
tenths of an inch
Rectangular Sensors
Example: To order a rectangular sensor with a 4.1 X 7.1 window and a
5-60 A trip current, the catalog number would be GFL 041 X 071-1.
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BGFL Current Detection Systems Ground Fault
Typical Response Curves
Cardinal points are shown for clarity only.
The actual time delay adjustment is continuously variable between instantaneous and 1 second. The time delay tolerance is ± 15% of setting.
Test Procedure
To determine if the neutral is grounded in only one place at the service entrance ( in accordance with The National
Electrical Code):
1. Disconnect power.
2. Remove ground bond link.
3. With a “megger”, measure the resistance of each phase and neutral to ground. The resistance should be 1 megohm in accordance with
NEC requirements. Reading as low as 100 ohms will pass a minimal current so as not to affect BGFL calibration on the 100 - 1200A relay.
The 5-60A and 30-360A relay calibration will be affected if set at the lowest setting.
4. Reconnect bond link, reconnect power and check power LED for illumination.
To test the entire system including the disconnect device:
1. Check for control power, the LED should be illuminated.
2. Press the “Push To Test” switch on the relay. The trip indicator will go to the tripped position and disconnect device will open.
3. Reset the relay and the disconnect device. System is now back to normal.
To test the ground Fault Relay and Sensor only (The sensor will trip the relay in this test).
1. Check for control power, the LED should be illuminated.
2. Press and HOLD the “Shunt Trip Bypass” switch on the relay.
3. Press the “Push To Test” switch. The Ground Fault Relay will trip.
4. Reset the relay, then release the “Shunt Trip Bypass” switch. System is now back to normal.
THE ABOVE TEST PROCEDURES SHOULD BE PERFORMED BY QUALIFIED PERSONNEL ONLY
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Typical Wiring Diagrams
Typical Wiring Diagram for "Standard"
and "Zone Interlocking" Circuitry
(BGFLXX7-XXXX and BGFLXX9-XXXX)
Typical Wiring Diagram
for "Form C"Circuitry
(BGFLXX4-XXXX)
Typical Wiring Diagram Zone Selective Interlocking
RELAY CONTACT
6 COMMON
7 OUTPUT (Note:# 2)
8 INPUT-TIMED TRIP
9 INPUT - NO TRIP
NOTES:
1) All zone interlocking wiring should be twisted pair, 20 AWG or large.
2) No more than 10 upstream units should be connected to a single output.
3) For relays with dc input voltage, connect 120 V ac test circuit to the 24”
long black lead and terminal #2
Grid-AIS-L4-ITI_Model_BGFL-1131-2017_06-EN. © Copyright 2017. General Electric Company
and Instrument Transformers LLC reserve the right to change specifications of described
products at any time without notice and without obligation to notify any person of such changes.
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