Experimental studies of circuit breaker drives and mechanisms diagnostics

Diagnostics of a circuit breaker is usually performed using a digital processing of voltage and current signals, that gives the assessment of the mechanical work delivered by the drives. Results of such systematic and long-term measurements, gathered for large enough population and analyzed using statistic methods make possible rational management of circuit breaker (CB) assets. This Paper shows experimental studies and analysis of symptoms of changes in the state of mechanism comprised in motion characteristics made on medium voltage circuit breaker with introduced defects.