P.9.4
SEL-411L Relay Protection Manual Date Code 20151029
Monitoring and Metering
Circuit Breaker Monitor
Table 9.1 shows typical circuit breaker maintenance information from an
actual SF6 circuit breaker. The log/log plot of Figure 9.2 is the circuit breaker
maintenance curve, produced from the Table 9.2 data.
Figure 9.2 Circuit Breaker Maintenance Curve (Manufacturer’s Data)
The three set points necessary to reproduce this circuit breaker maintenance
curve in the relay are listed in Table 9.3 for Circuit Breaker 1. This circuit
breaker contact wear curve is shown in Figure 9.3.
Table 9.2 Circuit Breaker Maintenance Information—Example
Current Interruption Level (kA) Permissible Close/Open Operations
a
a
The action of a circuit breaker closing and then later opening is considered one close/open
operation.
0.00–1.2 10000
2.00 3700
3.00 1500
5.00 400
8.00 150
10.00 85
20.00 12
Table 9.3 Contact Wear Monitor Settings—Circuit Breaker 1
Setting Definition Range
B1COSP1 Close/open set point 1—max 0–65000 close/open operations
B1COSP2 Close/open set point 2—mid 0–65000 close/open operations
B1COSP3 Close/open set point 3—min 0–65000 close/open operations
B1KASP1
a
a
The ratio of settings B1KASP3/B1KASP1 must be in the range: 5 B1KASP3/B1KASP1 100.
kA interrupted set point 1—min 1.0–999 kA in 0.1 kA steps
B1KASP2 kA interrupted set point 2—mid 1.0–999 kA in 0.1 kA steps
B1KASP3
a
kA interrupted set point 3—max 1.0–999 kA in 0.1 kA steps
1 10 100
kA Interrupted per Operation (kA)
Number of Close/Open Operations
10000
1000
100
10
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