Application of the Gray Correlation Model in Fault Diagnosis of High-Voltage Circuit Breakers
Yang Zhiz · Power System Technology · 2015
Focusing on the characteristics of strong randomness and fuzziness of high voltage circuit breakers' fault,a new diagnostic model on the mechanical failure of the high voltage circuit breakers is established based on the grey relation analysis method(GRAM).The coil current and the value of time node during breaking and closing course of high voltage circuit breakers are taken as the characteristic parameters to construct the reference vectors and comparing vectors. Then the state of the circuit breakers can be identified in sequence through the calculation results of the fault diagnosis model. Case study shows that the fault diagnosis model based on the GRAM can effectively diagnose the mechanical failure of circuit breakers. Meanwhile, different distinguishing coefficient value has a significant influence on the resolution and reliability of diagnosis result. For the mechanical failure of circuit breakers, a smaller distinguish coefficient value can guarantee higher reliability.