Circuit Breaker Arcing - GE D90 Plus Instruction Manual

BREAKER MANAGEMENT
Breaker management

Circuit breaker arcing

436
Figure 363: Equipment manager block diagram
This section describes the breaker management features of the equipment manager.
The breaker arcing function provides indications of the condition of the circuit breaker
interrupter. The primary function is measurement of accumulated contact wear. This is
accomplished by integrating the current passing through the breaker during interruption.
The function compares the accumulated arcing current with manufacturer data to provide
an indication that the breaker requires maintenance. The function also measures the total
clearing time, and the maximum interrupted current. This latter value is compared with
manufacturer data to determine if the interrupt rating of the breaker has been exceeded.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 9: EQUIPMENT MANAGER