Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-22 973.334.3100
operate level based upon the currents measured by both relays. This is used to desensitize the relay
with increasing current to allow for cumulative system errors such as CT nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the slope to 0.01.
Phase Operate Current Slope 2 (0.01-2 inc 0.01)
This sets the slope for the second segment of the slope characteristic for phase A, B, and C. The
setting must be between 0 and 2 (inclusive) in increments of 0.01. The slope characteristic increases
the operate level based upon the currents measured by both relays. This is used to desensitize the relay
with increasing current to allow for cumulative system errors such as CT nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the slope to 1.
Phase Operate Current Crossover (5-30 inc 0.125)
This sets the transition point between the first and second slope segments of the slope characteristic for
phase A, B, and C. The setting must be between 5A
RMS
and 30A
RMS
(inclusive) in increments of
0.125A
RMS
. The slope characteristic increases the operate level based upon the currents measured by
both relays. This is used to desensitize the relay with increasing current to allow for cumulative
system errors such as CT nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the crossover to 20A.
Ground Operate Current Slope 1 (0.01-2 inc 0.01)
This sets the slop for the first segment of the operate level slope characteristic for ground. The setting
must be between 0 and 2 (inclusive) in increments of 0.01. The operate level slope characteristic
increases the operate level based upon the currents measured by both relays. This is used to
desensitize the relay with increasing current to allow for cumulative system errors such as CT
nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the slope to 0.01.
Ground Operate Current Slope 2 (0.01-2 inc 0.01)
This sets the slop for the second segment of the operate level slope characteristic for ground. The
setting must be between 0 and 2 (inclusive) in increments of 0.01. The operate level slope
characteristic increases the operate level based upon the currents measured by both relays. This is used
to desensitize the relay with increasing current to allow for cumulative system errors such as CT
nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the slope to 1.
Ground Operate Current Crossover (5-30 inc 0.125)
This sets the transition point between the first and second slope segments of the slope characteristic for
ground. The setting must be between 5A
RMS
and 30A
RMS
(inclusive) in increments of 0.125A
RMS
. The
slope characteristic increases the operate level based upon the currents measured by both relays. This
is used to desensitize the relay with increasing current to allow for cumulative system errors such as
CT nonlinearities.
For further information see section 13.5.1.2.8.
To emulate a setting equivalent to the RFL 9300 relay, set the crossover to 20A.
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