Sel 751A - Figure 5.17 Plotted Breaker Maintenance Points for a 25 Kv Circuit Breaker

5.17
Date Code 20100129 Instruction Manual SEL-751A Relay
Metering and Monitoring
Breaker Monitor
The following settings are made from the breaker maintenance information in
Table 5.9 and Figure 5.17. Figure 5.18 shows the resultant breaker
maintenance curve.
COSP1 = 10000
COSP2 = 150
COSP3 = 12
KASP1 = 1.20
KASP2 = 8.00
KASP3 = 20.00
Figure 5.17 Plotted Breaker Maintenance Points for a 25 kV Circuit Breaker
10,000
1000
2
3
4
5
6
7
8
9
100
2
3
4
5
6
7
8
9
10
2
3
4
5
6
7
8
9
123456789
50
40
30
20
10
.5
Number of Close/Open Operations
kA Interrupted per Operation