SYSTEM AND METHOD FOR TRIP COIL CURRENT SIGNATURE MONITORING

Abstract: an online monitor is provided including a sensor to measure current through a circuit breaker trip coil, and a processor configured to sample reference samples from the sensor during a first tripping sequence to generate a reference trip coil current signature waveform (“tccsw”), compute a reference sample value for each reference sample, and add the reference sample values corresponding to a reference area to determine a reference area value. the processor is further configured to respond to detection of a second tripping sequence by sampling measured samples from the sensor to generate a measured tccsw, computing a measured sample value for each measured sample, adding the measured sample values corresponding to a measured area to determine a measured area value, and determine whether a difference percentage between the reference area value and the measured area value exceeds an alarm limit.

Inventor(s): James A. Webber

CPC Classification: G01R31/3275 (Testing of circuit interrupters, switches or circuit-breakers)

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