5.16
SEL-751A Relay
Instruction Manual
Date Code 20100129
Metering and Monitoring
Breaker Monitor
for a breaker maintenance curve. To
estimate this breaker maintenance curve in the SEL-751A breaker monitor,
three set points are entered:
These three points are entered with the settings in
Table 5.9
Breaker Maintenance Information for a 25 kV Circuit Breaker
Current Interruption Level (kA)
Permissible Number of
Close/Open Operations
a
a
The action of a circuit breaker closing and then later opening is counted as
one
close/open
operation.
0.00–1.20
10,000
2.00
3,700
3.00
1,500
5.00
400
8.00
150
10.00
85
20.00
12
Set Point 1
COSP1
maximum
number of close/open operations with
corresponding current interruption level.
Set Point 2
COSP2
number of close/open operations that correspond to
some
midpoint
current interruption level.
Set Point 3
COSP3
number of close/open operations that correspond to
the
maximum
current interruption level.
Table 5.10
Breaker Monitor Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
Breaker Monitor
(Y,N)
EBMON := Y
CL/OPN OPS SETPT 1
(0–65000)
COSP1 := 10000
a
a
COSP1 must be set greater than COSP2.
CL/OPN OPS SETPT 2
(0–65000)
COSP2 := 150
b c
b
COSP2 must be set greater than or equal to COSP3.
c
If COSP2 is set the same as COSP3, then KASP2 must be set the same as KASP3.
CL/OPN OPS SETPT 3
(0–65000)
COSP2 := 12
kA PRI INTERRPTD 1
(0.10–999.00 kA)
KASP1 := 1.20
d
d
KASP1 must be set less than KASP2.
kA PRI INTERRPTD 2
(0.10–999.00 kA)
KASP2 := 8.00
kA PRI INTERRPTD 3
(0.10–999.00 kA)
KASP3 := 20.00
e
e
KASP3 must be set at least five times (but no more than 100 times) the KASP1 setting value.
BRKR MON CONTROL
SEL
OGIC
BKMON := TRIP
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