Date Code 990430 Breaker/Recloser Monitor, Battery System Monitor, 8-11
Metering, and Load Profile Functions
SEL-351P Manual Técnico
50% to 100% Breaker Wear
Refer to
Figure SECTION 8: .7. The current value changes from 12.0 kA to 1.5 kA. 1.5 kA is
interrupted 3000 times (3000 close/open operations = 6000 - 3000), pushing the breaker
maintenance curve from the 50% wear level to the 100% wear level.
When the breaker maintenance curve reaches 100% for a particular phase, the percentage wear
remains at 100% (even if additional current is interrupted) until reset by the BRE R command
(see View or Reset Breaker Monitor Information that follows later). But the current and trip
counts continue to be accumulated until reset by the BRE R command.
Additionally, logic outputs assert for alarm or other control applications – see the following
discussion.
Breaker Monitor Output
When the breaker maintenance curve for a particular phase (A, B, or C) reaches the 100% wear
level (see
Figure SECTION 8: .7), a corresponding Relay Word bit (BCWA, BCWB, or BCWC)
asserts.
Relay Word bit
Definition
BCWA Phase A breaker contact wear has reached the 100% wear level
BCWB Phase B breaker contact wear has reached the 100% wear level
BCWC Phase C breaker contact wear has reached the 100% wear level
BCW BCWA + BCWB + BCWC
Example Applications
These logic outputs can be used to alarm:
OUT105 = BCW
or drive the relay to lockout the next time the relay trips:
79DTL = … + TRIP * BCW
View or Reset Breaker Monitor Information – Including Trip Operation Counters
Accumulated breaker wear/operations data are retained if the relay loses power or the breaker
monitor is disabled (setting EBMON = N). The accumulated data can only be reset if the BRE R
command is executed (see the following discussion on the BRE R command).
Via Serial Port
See BRE Command (Breaker Monitor Data) in Section 10: Serial Port Communications and
Commands. The BRE A command displays the following information:
• Accumulated number of recloser control initiated trips
• Accumulated interrupted current from recloser control initiated trips
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