Low-voltage direct-current circuit breaker mechanical fault diagnosis method

Abstract

The invention discloses a low-voltage direct-current circuit breaker mechanical fault diagnosis method which comprises the steps: simulating a plurality of common mechanical faults of the low-voltageDC circuit breaker, collecting a switching-on / off coil current signal and a mechanical vibration signal of the circuit breaker, carrying out the preprocessing of the collected signals, and extractinga characteristic parameter; and modeling by using a support vector machine algorithm and performing cross validation by using a K-Fold algorithm to obtain the accuracy of each diagnosis model; then carrying out dimension reduction on the extracted characteristic combination of the current and vibration signals by utilizing a characteristic dimension reduction technology, finally obtaining the accuracy and the stability of a diagnosis model constructed by the new characteristic combination, and selecting the model with the highest accuracy to be provided for a mechanical fault diagnosis program. The problems of few fault types, insufficient fault samples, single feature, excessive feature parameters and the like in existing low-voltage direct-current circuit breaker mechanical fault diagnosis research can be solved, and the diagnosis precision and efficiency are improved.

Description

technical field [0001] The disclosure belongs to the technical field of electric equipment, and in particular relates to a method for diagnosing a mechanical fault of a low-voltage DC circuit breaker. [0002] technical background [0003] With the accelerated development of urbanization in my country, the urban population has increased rapidly, and the demand for the development of urban rail transit has also increased. Rail transit locomotives use DC electric traction, and an average of one DC traction substation needs to be built every two kilometers in the construction project. And each DC traction substation requires 10 to 12 DC switchgears, and each DC switchgear contains a low-voltage DC circuit breaker. Therefore, with the development of urban rail transit, the demand for DC circuit breakers is increasing. [0004] According to the statistical research of existing switching accidents, it is found that mechanical faults account for more than 60% of the total faults o...

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Problems solved by technology

[0007] In view of the above problems, the purpose of the present disclosure is to provide a low-voltage DC circuit breaker mechanical fault diagnosis method based on current and vibration signals, which can overcome the problems of few fault types, insufficient fault samples, single features, and characteristic Problems such as too many parameters, by extracting the opening and closing coil current and mechanical vibration signal characteristics under various mechanical faults, using support vector machines, feature dimensionality reduction and other algorithms to diagnose mechanical faults with high precision and high efficiency

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