Fault diagnosis method of high voltage breaker

Abstract

The invention relates to a fault diagnosis method of a high voltage breaker, and belongs to online monitoring and fault diagnosis technologies of the high-voltage breakers. The method comprises that 1) the current of a closing / opening coil of the high voltage breaker is collected to form a data set; 2) different related state types of the breaker are coded, data is extracted randomly according tocertain proportion and serves as a pre-training sample, parameter tuning sample and a test sample, and the data is normalized; 3) a DBN classification network model is established, the pre-training data sample without a label is used to carry out network pre-training, and the sample with a label is used to carry out parameter tuning; and 4) the DBN after training is used for fault diagnosis of thehigh-voltage breaker. According to the method, manual operation of feature extraction can be avoided effectively, the problem of local optimization of network training is overcome, the operation state of the breaker can be identified effectively, the defect that a present fault diagnosis system cannot identify the degree of a fault is overcome, and breaker fault diagnosis becomes more intelligent.

Description

technical field [0001] The invention relates to an on-line monitoring and fault diagnosis technology for a high-voltage circuit breaker, in particular to a fault diagnosis method for a high-voltage circuit breaker. Background technique [0002] As an important part of the power system, the main function of the high voltage circuit breaker is control and protection. Real-time status monitoring and fault diagnosis of high-voltage circuit breakers can achieve real-time grasp of the operating status of the circuit breaker, and formulate a reasonable maintenance plan based on this, which is of great significance to ensure the safe operation of the power grid. According to the IEEE's suggestion on selecting the monitoring object of the circuit breaker, the most common state quantities are: circuit breaker moving contact stroke, circuit breaker contact and ambient temperature, opening and closing state, opening and closing coil current, energy storage motor current and open circuit...

AI Technical Summary

Problems solved by technology

In fact, it is not enough to know whether a fault has occurred or not and to locate the fault. For many devices, early minor faults are not enough to lead to repair or parts replacement.

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