Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-81 973.334.3100
LB Output Minor Alarm
A logical “1” indicates the relay is in a minor alarm condition and is sending this information out to the
logic bus.
LB Output Backup Mode
A logical “1” indicates the relay is in backup mode and is sending this information out to the logic bus.
LB Output Startup Mode
A logical “1” indicates the relay is in startup mode and is sending this information out to the logic bus.
LB Outputs Rx Transfer Status #0 through #7
A logical “1” indicates the corresponding logic bus output from the relay is active.
Phase A, B, C, and Ground Overcurrent FDs
A logical “1” indicates the corresponding phase has detected an overcurrent fault. Note that this is tied
to an algorithm internal parameter and is not fully processed into a true fault detector. This parameter
should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Peak Change FDs
A logical “1” indicates the corresponding phase has detected a peak change fault. Note that this is tied
to an algorithm internal parameter and is not fully processed into a true fault detector. This parameter
should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Pulse Width FDs
A logical “1” indicates the corresponding phase has detected a pulse width fault. Note that this is tied
to an algorithm internal parameter and is not fully processed into a true fault detector. This parameter
should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Slope Change FDs
A logical “1” indicates the corresponding phase has detected a slope change fault. Note that this is tied
to an algorithm internal parameter and is not fully processed into a true fault detector. This parameter
should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Polarity Change FDs
A logical “1” indicates the corresponding phase has detected a polarity change fault. Note that this is
tied to an algorithm internal parameter and is not fully processed into a true fault detector. This
parameter should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Breaker Closing FDs
A logical “1” indicates the corresponding phase has detected a breaker closing fault. Note that this is
tied to an algorithm internal parameter and is not fully processed into a true fault detector. This
parameter should be reviewed in conjunction with the “aggregate FD” described below.
Phase A, B, C, and Ground Aggregate FDs
A logical “1” indicates the corresponding phase has an active fault detector. This is the aggregate FD
– it is the combined and processed result from all of the individual FD elements. As described in the
individual FDs above, this is the only true indication that the relay has an active fault detector. All of
the above contributors to the FD are combined and extended as required to generate the aggregate fault
detector.
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