Circuit breaker opening/closing coil current signal identification method

Abstract

The invention discloses a circuit breaker opening / closing coil current signal identification method comprising the steps as follows: collecting an opening / closing coil current signal under normal operation of a circuit breaker operating mechanism, and extracting a feature data set; establishing a benchmark mode library of the circuit breaker opening / closing coil current signal; calculating the degree of fitting between a sample to be identified and the clustering centers in the benchmark mode library, and finding out the clustering center with the maximum degree of fitting; and identifying the operation rate of the circuit breaker operating mechanism according to the residual ratio, and realizing early warning for failure. According to the invention, a benchmark mode library is established for the circuit breaker opening / closing coil current signal based on a subtractive clustering algorithm, and when the circuit breaker is in an operation or maintenance state, the circuit breaker opening / closing coil current signal is compared with the benchmark mode library online to identify the operation state of the circuit breaker. Therefore, effective early warning for failure is realized, the need for fast, safe and efficient circuit breaker detection is satisfied, the shortage of the existing circuit breaker mechanical characteristic test method is solved effectively, and safe and stable operation of circuit breakers is guaranteed.

Description

technical field

[0001] The invention belongs to the technical field of electric engineering, and in particular relates to a method for identifying current signals of opening and closing coils of a circuit breaker. Background technique

[0002] According to statistics, 60%-70% of circuit breaker defects or failures are caused by circuit breaker mechanism defects, including: mechanism jamming, grease solidification, spring aging, slow opening and closing, broken connecting rod drive shaft, mechanism refusal to move, etc. Wait. However, the state detection technology of traditional circuit breakers, such as infrared and partial discharge (including ultra-high frequency, ultrasonic, transient ground wave) is only for the diagnosis of electrical contact defects and insulation parts (medium) defects, and has no effective state detection for circuit breaker mechanisms. testing method.

[0003] Since there is currently no effective technical means to predict the operating mechanis...

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