Current Differential Relay
GARD 8000 SYS RFL Electronics
June 20, 2014 13-82 973.334.3100
Phase A, B, C, and Ground Aggregate Trips
A logical “1” indicates the corresponding phase has tripped. This is the aggregate trip – it is the
combined and processed result from all of the individual trip elements. This is the phase-specific trip
signal that is sent to the logic bus and is used to generate the actual trip signal. All of the contributors
to the tripping process (as listed below) are combined and extended as required to generate the
aggregate trip signals.
Phase A, B, and C Open Conductor Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the open
conductor (primary) algorithm. Note that this is tied to an algorithm internal parameter and is not fully
processed into a true trip output. This parameter should be reviewed in conjunction with the
“aggregate trips” described above.
Phase A, B, C, and Ground Curr Diff Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the current
differential (primary) algorithm. Note that this is tied to an algorithm internal parameter and is not
fully processed into a true trip output. This parameter should be reviewed in conjunction with the
“aggregate trips” described above.
Phase A, B, C, and Ground HST Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the HST
(primary) algorithm. Note that this is tied to an algorithm internal parameter and is not fully processed
into a true trip output. This parameter should be reviewed in conjunction with the “aggregate trips”
described above.
Phase A, B, C, and Ground Breaker Open
A logical “1” indicates the corresponding phase has determined the breaker to be open. In a single-
pole system the phases operate independently, in a three-pole system they will all be the same.
Phase A, B, C, and Ground TOC Backup Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the TOC
(backup) algorithm. Note that this is tied to an algorithm internal parameter and is not fully processed
into a true trip output. This parameter should be reviewed in conjunction with the “aggregate trips”
described above.
Phase A, B, C, and Ground Overcurrent Backup Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the
overcurrent backup algorithm. Note that this is tied to an algorithm internal parameter and is not fully
processed into a true trip output. This parameter should be reviewed in conjunction with the
“aggregate trips” described above.
Phase A, B, C, and Ground LOL Backup Trips
A logical “1” indicates the corresponding phase has detected a trip condition based upon the LOL
backup algorithm. Note that this is tied to an algorithm internal parameter and is not fully processed
into a true trip output. This parameter should be reviewed in conjunction with the “aggregate trips”
described above.
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