Abstract

Nowadays, circuit breakers (CBs) condition monitoring is essential due to the importance of the performance of these critical elements in the stability of the power grid against various faults. Exposure of the interruption chamber including main and arc contacts to high voltages along with the lack of access complicates the online condition monitoring of the CBs. Measuring the resistance of the contacts, the amount of current and the energy passing through the CB during the operation are common methods for CB condition monitoring. In this paper, a new approach is proposed based on frequency analysis to detect defects related to the non-connection of the fixed and moving parts of the main and arc contacts. It can distinguish defects from each other with proper accuracy.

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