Schweitzer Engineering Laboratories SEL-421-4 - Page 1058

8.20
SEL-400 Series Relays Instruction Manual Date Code 20171006
Monitoring
Circuit Breaker Monitor
Preload Breaker Wear
You can preload a separate contact wear value for each pole of each circuit
breaker by using the command BRE n P for Circuit Breaker n. The relay adds the
incremental contact wear at all subsequent circuit breaker monitor initiations to
your preloaded value to obtain a total wear value. You can enter integer values of
percentage wear from 1 to 100 percent. In addition to preloading contact wear
data, you can enter values for previous operations and accumulated currents. The
maximum number of operations or accumulated primary current (in kA) you can
enter is 9999999. The circuit breaker preload terminal screen is similar to
Figure 8.11 for both the terminal and QuickSet.
When performing circuit breaker testing, capture the BRE n P information (write
the date or use a terminal screen capture) before testing. Test the circuit breaker,
then enter the previously recorded preload data with the BRE n P command.
Using this method, you can eliminate testing operations from actual usage data in
the circuit breaker monitor.
SEL Compressed ASCII Circuit Breaker Report
You can retrieve a Compressed ASCII circuit breaker report by using the CBR
command from any communications port.
The relay arranges items in the Compressed ASCII circuit breaker report in a spe-
cial order. For the purpose of improving products and services, SEL sometimes
changes the items and item order.
The information presented below explains the message and serves as a guide to
the items in a Compressed ASCII configuration circuit breaker report.
The format of the Compressed ASCII CBR message is the following.
=>BRE 1 P <Enter>
Accum Contact Wear (%) A-phase % := 5 ? 12 <Enter>
B-phase % := 10 ? 15 <Enter>
C-phase % := 7 ? 10 <Enter>
Accum Num of Operations: A-phase := 25 ? 11 <Enter>
B-phase := 25 ? 11 <Enter>
C-phase := 25 ? 11 <Enter>
Accum Pri Current (kA) Trip A := 99.0 ? 299 <Enter>
Trip B := 98.0 ? 254 <Enter>
Trip C := 98.0 ? 257 <Enter>
Pole A Pole B Pole C
Accum Contact Wear (%) 12 15 10
Accum Num of Operations 11 11 11
Accum Pri Current (kA) 299 254 257
Figure 8.11 Circuit Breaker Preload Data
“RID”,“SID”,“FID”,“yyyy”
relayid,station,fidstring,"yyyy"
"BID","yyyy"
breakerid,"yyyy"
"AVG_TR_ELE","LST_TR_ELE","AVG_TR_MEC","LST_TR_MEC","LST_TRmDC1",
"LST_TRmDC2","TR_INAC(d)","MAX_TR_SCA","LST_TR_SCA", "AVG_CL_ELE",
"LST_CL_ELE","AVG_CL_MEC","LST_CL_MEC","LST_CLmDC1",
"LST_CLmDC2","CL_INAC(d)","MAX_CL_SCA","LST_CL_SCA", "ACC_I(kA)",
"ACC_WEAR(%)","MAX_INT_I(%)","LAST_INT_I(%)","NUM_OPS","yyyy"
fff,fff,fff,fff,fff,fff,iii,fff,fff,fff,fff,fff,fff,fff,fff,iii,fff,fff,
fff,fff,fff,fff,iii,"yyyy"
fff,fff,fff,fff,fff,fff,iii,fff,fff,fff,fff,fff,fff,fff,fff,iii,fff,fff,
fff,fff,fff,fff,iii,"yyyy"
fff,fff,fff,fff,fff,fff,iii,fff,fff,fff,fff,fff,fff,fff,fff,iii,fff,fff,
fff,fff,fff,fff,iii,"yyyy"
"AVG_MOT_RT","LST_MOT_RT","RST_MONTH","RST_DAY","RST_YEAR","RST_HOUR","RST_MIN",
"RST_SEC","yyyy"
iii,iii,iii,iii,iii,iii,iii,iii,"yyyy"