5.24
SEL-700G Relay
Instruction Manual
Date Code 20170814
Metering and Monitoring
Breaker Monitor
Breaker Monitor
Output
When the breaker maintenance curve for a particular phase (A, B, or C)
reaches the 100 percent wear level (see Table 5.12), a corresponding Relay
Word bit (BCWAn, BCWBn, or BCWCn) asserts.
Example Applications
You can use these logic outputs to alarm:
OUTxxx =
BCW
n
View or Reset
Breaker Monitor
Information
Accumulated breaker wear/operations data are retained if the relay loses
power or if the breaker monitor is disabled (setting EBMONn := N). The
accumulated data can only be reset if the BRE n R command is executed (see
the following discussion on the BRE n R command).
Via Serial Port
See Section 7: Communications. The BRE n command displays the following
information:
➤
Accumulated number of relay-initiated trips
➤
Accumulated interrupted current from relay-initiated trips
➤
Accumulated number of externally initiated trips
➤
Accumulated interrupted current from externally initiated trips
➤
Percent circuit breaker contact wear for each phase
➤
Date when the preceding items were last reset (via the BRE n R
command)
See Section 7: Communications. The BRE n W command allows the trip
counters, accumulated values, and percent breaker wear to be preloaded for
each individual phase.
The BRE n R command resets the accumulated values and the percent wear
for all three phases. For example, if breaker contact wear has reached the 100
percent wear level for A-phase, the corresponding Relay Word bit BCWA
asserts (BCWAn = logical 1). Execution of the BRE n R command resets the
wear levels for all three phases back to 0 percent and consequently causes
Relay Word bit BCWA to deassert (BCWAn = logical 0).
Via Front Panel
The information and reset functions available via the previously discussed
serial port commands BREn and BRE n R are also available via the front
panel. See Section 8: Front-Panel Operations for details.
Table 5.12
Breaker Monitor Output
Relay Word
Bits
Definition
BCWAn
Phase A breakern contact wear has reached the 100 percent wear level
BCWBn
Phase B breakern contact wear has reached the 100 percent wear level
BCWCn
Phase C breakern contact wear has reached the 100 percent wear level
BCWn
BCWAn or BCWBn or BCWCn
where n is X for X-side and Y for Y-side breakers
Summary of Contents for SEL-700G Series
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