Schweitzer Engineering Laboratories SEL-311C - Table 8.3 Breaker Monitor Output Relay Word Bits; View or Reset Breaker Monitor Information

8.12
SEL-311C Relay Instruction Manual Date Code 20060320
Breaker Monitor and Metering Functions
Breaker Monitor
Example Applications
These logic outputs can be used to alarm:
OUT105 = BCW
View or Reset
Breaker Monitor
Information
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) on page 10.15. The BRE
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 R
command)
See BRE n Command (Preload/Reset Breaker Wear) on page 10.34. The
BRE W command allows the internal trips and currents, the external trips and
currents, and the percent breaker wear to be preloaded for each individual
phase.
The BRE 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 (BCWA = logical 1). Execution of the BRE R command resets the
wear levels for all three phases back to 0 percent and consequently causes
Relay Word bit BCWA to deassert (BCWA = logical 0).
Via Front Panel
The information and reset functions available via the previously discussed
serial port commands BRE and BRE R are also available via the front-panel
{OTHER} pushbutton. See Figure 11.3.
Table 8.3 Breaker Monitor Output Relay Word Bits
Relay
Word Bits
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