Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-25 973.334.3100
Backup Settings Definitions:
Backup Functions Enable
This is used to enable or disable all backup functions in the relay (see section 13.5.1.6). Note that this
setting has no effect on the Stub Bus Function which technically is not a backup function.
Overcurrent Backup Enable
This is used to enable or disable the overcurrent backup function in the relay (see section 13.5.1.6).
Phase Overcurrent Backup Setpoint (6-31.875 inc 0.125)
This sets the threshold for the overcurrent backup algorithm for phase A, B, and C. The setting must
be between 6A
RMS
and 31.875A
RMS
(inclusive) in increments of 0.125A
RMS
.
For further information see section 13.5.1.6.
Ground Overcurrent Backup Setpoint (0.125-31 inc 0.125)
This sets the threshold for the overcurrent backup algorithm for ground. The setting must be between
0.125A
RMS
and 31A
RMS
(inclusive) in increments of 0.125A
RMS
.
For further information see section 13.5.1.6.
Backup Overcurrent Timer (0-1000 inc 10)
This sets the timer for the overcurrent backup algorithm for both the three phases and ground. The
setting must be between 0ms and 1s (inclusive) in increments of 10ms.
For further information see section 13.5.1.6.
Time Overcurrent Backup Enable
This enables or disables the TOC functions for both the three phases and ground.
For further information see section 13.5.1.6.2.
Phase TOC Characteristic
This selects which TOC characteristic curve to use for phase A, B, and C. There are four USA curves
and three IEC curves supported.
For further information see section 13.5.1.6.2.
Phase TOC Pickup (0.5-31.875 inc 0.125)
This selects the TOC pickup current for phase A, B, and C. The setting must be between 0.5A
RMS
and
31.875A
RMS
(inclusive) in increments of 0.125A
RMS
.
For further information see section 13.5.1.6.2.
Phase TOC Dial (0.05-15.0 inc 0.05)
This selects the TOC time dial for phase A, B, and C. The setting must be between 0.05 and 15
(inclusive) in increments of 0.05.
For further information see section 13.5.1.6.2.
Ground TOC Characteristic
This selects which TOC characteristic curve to use for ground. There are four USA curves and three
IEC curves supported.
For further information see section 13.5.1.6.2.
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