Monitoring Electrical Contactor Health

Abstract: a method of monitoring contactor health for an electrical contactor of an electric apparatus, the electrical contactor being switchable in a switching event between an open state and a closed state or between a closed state and an open state. in response to a switching event instruction the method comprises determining a current value indicative of current flowing in the electrical contactor in the closed state at a time proximate to the switching event; attributing a percentage of a total contactor life estimate to the switching event based on the current value; determining an updated remaining percentage contactor life estimate by subtracting the percentage of total contactor life estimate from an initial remaining percentage contactor life estimate; and outputting the updated remaining percentage contactor life estimate.

Inventor(s): Adam STUBBS, Michael David SMITH, Craig COX

CPC Classification: G01R31/3333 (MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits ))

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