Abstract:

The basic concept of selective protection for circuit breakers,and the important significance of conducting research on selective protection for circuit breakers to ensure power supply continuity and reliability were introduced.A circuit breaker parameter was designed using the time current characteristic curve for a certain ship’s power system.A five level circuit breaker test platform was built to verify the selectivity between the five level circuit breakers from top to bottom.it was found that there were bypass defects.Finally,an improved time current characteristic curve was proposed to achieve selective protection,which was verified through experiments.

Key words: circuit breaker, power system, time-current characteristic curve, selective protection