Automated Analysis of Circuit Breaker Operations

The automated circuit breaker diagnostic system described in this paper is an extension of the widely used portable circuit breaker testing device concept. These traditional testing devices can be connected to the circuit breaker’s control circuit to record analog and digital signals. The operator opens and closes the circuit breaker each time the test is performed and makes the recordings. The traditional analysis is done manually by overlaying traces from a “good” case recorded earlier and making a judgment of how different the new case is.