496 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CIRCUIT BREAKER ARCING MANAGEMENT CHAPTER 9: EQUIPMENT MANAGER
Exponent
Range: 1.000 to 5.000 in steps of 0.001
Default: 2.000
This setting specifies the accumulated breaker wear that is proportional in the following
equation,
Eq. 45
where x is the arcing exponent. The typical value for the arcing exponent is 2.
Interruption Rating
Range: 0.0 to 100.0 kA in steps of 0.1
Default: 31.5 kA
This setting specifies the maximum symmetrical interruption rating of the circuit breaker.
Arcing Time Offset
Range: 0 to 50 ms in steps of 1
Default: 0 ms
This setting specifies the time difference between the dropout of the 52a auxiliary
contact and the parting of the circuit breaker contacts (measured from a circuit breaker
timing diagram).
Block
Range: any equipment manager operand or shared operand
Default: OFF
Assertion of the operand assigned to this setting blocks operation of the circuit breaker
arcing element.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables or disables the recording of breaker arcing current events in the
sequence of events record.
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