GFL631T-3 INSTRUMENT TRANSFORMER, GFL631T-3 Datasheet - Page 11

• Manufacturer Part Number: GFL631T-3
• Description: GROUND FAULT CURENT
• Manufacturer: INSTRUMENT TRANSFORMER

Specifications of GFL631T-3

• Accuracy: 15%
• Current Measuring Range Ac: 30A To 360A

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Pick-Up and Time Delay Characteristics
magnitude pick-up and “D” is the highest . The pick up level is dependent on the
energy in a ground fault wave shape; therefore tripping initiation depends on the
wave shape and regularity of the fault current .
current range on the “A” setting with a sinusoidal signal, and will pick up before
150% of the high end of the sensor range on the “D” setting. The relay is
adjustable continuously from “A” to “D” so that identical sensors can be
coordinated.
As the fault current increases, the trip time delay gets shorter. The GFM-252,
GFM-353, GFM-453 relays do not have adjustable trip time delay, while the
GFM-262, GFM-363, GFM-463 relays have adjustable trip time delay.
the pick up threshold. Trip time on Models with adjustable time delay, may
exceed a one second delay at the pick up threshold, however the inverse time
curve can be modif ied to vary trip time at multiples of over current with an
ordinal “1” to “4” is scale where “1” is faster and “4” is slower.
seconds on the “A” setting, and 0.1 seconds on the “D” setting at high fault
currents.
produce a time delay of under 0.15 seconds at a 600% sinusoidal fault . A time
delay setting of “4” will result in a time delay approximately 0.2 seconds slower
than the “1” setting. Time delay will be greater for smaller fault current .
of under 0.4 seconds at a 600% sinusoidal fault . A time delay setting of “4” will
result in a time delay approximately 0.2 seconds slower than the “1” setting.
Time delay will be greater for smaller fault current .
Pick-Up and Time Delay Characteristics
ITI GFM sensors are assigned a current range to indicate a pick-up current level.
The GFM relay has a range select from “A” to “D”. “A” is the lowest current
In general, the relay will pick up before 150% of the low end of the sensor
The ITI GFM ground fault system has inverse time current trip characteristics.
Trip time on Models with f ixed time delay, may exceed a one second delay at
The pick up time delay on the f ixed time delay relays can be as fast as 0.02
For the adjustable time delay relays, a time delay of “1” in the “A” scale can
Similarly, a time delay setting of “1” in the “D” scale can produce a time delay
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