Fault diagnosis method for engaging and disengaging coil of circuit breaker

Abstract

The invention discloses a fault diagnosis method for an engaging and disengaging coil of a circuit breaker. According to the invention, current of the engaging and disengaging coil of the circuit breaker is taken as the diagnosis object, normal data of the engaging and disengaging coil of the circuit breaker is collected to form a data base and then an improved dynamic time scheduling algorithm is utilized for comparing the detection data with data in the normal data base for judging whether faults occur. According to the improved dynamic time scheduling algorithm, a cost matrix is calculated based on the detection data and the normal data and an accumulation cost matrix is calculated by adopting a constraint condition of an Sakoe-Chiba window and two groups of scheduling paths with optimal data are found in the accumulation cost matrix and are displayed on a t-t map. If the optimal scheduling paths offset, the engaging and disengaging coil of the circuit breaker meets faults and the fault type can be determined based on the offset time point and type of the optimal scheduling paths. Compared with other fault diagnosis method, the method provided by the invention is simple in computation process and more accurate and direct in diagnosis results.

Description

technical field [0001] The invention relates to a fault diagnosis method for an opening and closing coil of a circuit breaker, which belongs to the fault diagnosis technology of a circuit breaker. Background technique [0002] In the power system, the circuit breaker is one of the most important main equipment. In order to ensure the reliable operation of circuit breakers, more and more attention has been paid to the state detection technology of circuit breakers. At the same time, higher requirements are put forward for the fault diagnosis methods of circuit breakers. According to the statistics of the State Grid Corporation of China in 2004, 275,373 high-voltage circuit breakers from 7.2 to 550 kV failed 392 times, of which refusing to operate accounted for 23% of the total. The opening and closing coils are the key mechanisms for starting the opening and closing actions of the circuit breaker. Failure of the opening and closing coils can easily cause the circuit breaker ...

AI Technical Summary

Problems solved by technology

[0003] At present, the algorithms of wavelet analysis, support vector machine, particle swarm and fuzzy theory are mostly used in the fault diagnosis methods of circuit breaker opening and closing coils, and the calculation process of these algorithms is relatively complicated.

Images