Method and device for diagnosing mechanical characteristic failures of high-voltage circuit-breaker

Abstract

The invention belongs to the technical field of circuit-breaker failure diagnosis, and particularly relates to a method and device for diagnosing mechanical characteristic failures of a high-voltage circuit-breaker. The device comprises the circuit-breaker and further comprises a vibration sensor, a voltage conditioning element, an AD conversion element, a clock element, a power element, a central processing unit, a communication unit and a failure diagnosis upper computer. According to mechanical vibration signals in the motion process of the circuit-breaker, the vibration sensor, the voltage conditioning element, the AD conversion element, the clock element, the power element, the central processing unit, the communication unit and the failure diagnosis upper computer are utilized for achieving the mechanical characteristic failure diagnosis of the circuit-breaker. The method for diagnosing mechanical characteristic failures comprises the steps of conducting wavelet packet decomposition on vibration signals in the operation process of the high-voltage circuit-breaker, extracting characteristic vectors of the vibration signals in spectral entropy of each frequency band, and adopting a relevance vector machine algorithm to conduct failure diagnosis on the mechanical characteristics of the high-voltage circuit-breaker. The method and device can effectively diagnoses the mechanical characteristic failures of the circuit-breaker, and provide a basis for the state maintenance of the circuit-breaker.

Description

technical field [0001] The invention belongs to the technical field of circuit breaker fault diagnosis, and in particular relates to a high-voltage circuit breaker mechanical characteristic fault diagnosis device and method. Background technique [0002] The high voltage circuit breaker is one of the important equipment in the power system. Its operating status directly affects the operation stability and power supply reliability of the power system. The mechanical characteristics of the high voltage circuit breaker can reflect more than 80% of the faults. When the circuit breaker is operating, corresponding to the action of each component in the mechanism, there will be a vibration event on the vibration signal time diagram. The frequency of events within any one operation varies, but the order in which events occur does not. The iron and aluminum structure of the circuit breaker is a good conductor of the vibration signal. For the operation under the same condition measur...

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Problems solved by technology

The domestic work in this area started relatively late, and the research work in this area was only gradually carried out in the 1990s. At present, there are not many practical products.

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