Mechanical Fault Diagnosis Method for Operating Mechanism of High Voltage Circuit Breaker Used in Power System

Abstract

The invention relates to a mechanical fault diagnosis method of a high voltage breaker operation mechanism for an electric power system and belongs to the electrical equipment latent mechanical fault diagnosis technology field. Common latent mechanical faults such as opening refusal, closing refusal, an opening error and a closing error of the high voltage breaker operation mechanism can be reflected by the time and the amplitude of closing / opening coil currents of the operation mechanism. According to the method, present closing / opening coil current waveforms are quantitatively compared with factory closing / opening coil current waveforms, the quantification deviation D is taken as a criterion for determining the mechanical structure damage degree of the high voltage breaker operation mechanism, so fault early warning can be carried out visually, equipment safety is guaranteed, the method is convenient for an operator to make reasonable state maintenance strategies for the high voltage breaker operation mechanism, reliable technical supports are provided for manufacturing and operation of high voltage breakers, compared with an ocular estimation method employed in test fields presently, the method is advantaged in that scientific property, accuracy and determination efficiency are remarkably improved.

Description

technical field [0001] The invention relates to a mechanical fault diagnosis method for an operating mechanism of a high-voltage circuit breaker in an electric power system, and belongs to the technical field of latent mechanical fault diagnosis of electrical equipment. Background technique [0002] As an important device in the power system, the high-voltage circuit breaker is responsible for breaking the system structure and realizing the arduous task of arranging various load network configurations; at the same time, the circuit breaker is also used to isolate the faulty part of the power system and reduce the impact of partial system faults on the entire power grid. harm to the system. Such an important role requires the circuit breaker to be ready for opening and closing operations at any time, and any operational error may have serious consequences. In order to avoid misoperation of the circuit breaker, it is essential to overhaul and maintain the circuit breaker. Wi...

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Problems solved by technology

[0003] 1) With the increasing scale of the power grid, the contradiction between the number of high-voltage circuit breakers, the number of maintenance personnel, and the maintenance cost is becoming more and more prominent, and the phenomenon of over-period maintenance of equipment is becoming more and more serious

[0004] 2) Due to the relatively backward technical means for detecting the health status of the mechanical characteristics of the circuit breaker operating mechanism, the minor repairs of traditional circuit breakers are not targeted, and there are disadvantages of "minor illnesses and major repairs, and repairs without diseases". The results cannot effectively guide the circuit breaker maintenance strategy

At present, the common method is to judge the mechanical failure of the circuit breaker by comparing the current waveform of the current opening and closing coil and the current waveform of the opening and closing coil when the equipment leaves the factory after the circuit breaker has been running for a period of time. This often requires a lot of on-site experience or perceptual knowledge , which is very difficult and exhausting for scientifically judging the severity of defects in the circuit breaker operating mechanism

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