High-voltage circuit breaker mechanical state monitoring and fault diagnosis method

Abstract

The invention discloses a high-voltage circuit breaker mechanical state monitoring and fault diagnosis method. The method comprises the following steps of 1) according to the historical fault data statistics result of high-voltage circuit breakers, carrying out an artificial fault simulation experiment on some common high-voltage circuit breakers to obtain fault data; 2) analyzing the fault current data, and extracting the current data characteristic quantity of each mechanism fault to be used as one of state diagnosis classification basis; 3) analyzing a fault vibration signal, adopting wavelet packet decomposition and sample entropy for processing high-frequency and low-frequency components to obtain corresponding wavelet packet relative energy and sample entropy respectively to be usedas vibration signal characteristic quantities; and 4) performing dimensionality reduction on the vibration signal characteristic quantities through principal component analysis to be used as one of state diagnosis classification basis, and carrying out state diagnosis on the circuit breaker by a support vector machine. By adoption of the method, the multi-dimensional information of the fault statecan be effectively utilized, so that the development of multi-parameter multi-dimensional mapping fault diagnosis of the circuit breaker can be promoted.

Description

technical field [0001] The invention relates to the technical field of circuit breaker fault detection and diagnosis, in particular to a mechanical state monitoring and fault diagnosis method of a high-voltage circuit breaker. Background technique [0002] At present, the power grid system is expanding rapidly, and the safety and stability of power supply have gradually attracted people's attention. It is very necessary for normal operation. The most important part of the power grid is high-voltage electrical equipment, which becomes the basis for ensuring the safe and stable operation of the power grid. During the safe operation of the power grid, the circuit breaker plays a pivotal role as a current switching device that connects, disconnects, and connects to the general state. High-voltage circuit breakers generally refer to circuit breakers with a voltage level exceeding 3kV used in the power grid, which can also be disconnected and conducted within a certain period of...

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Problems solved by technology

[0003] Aiming at the existing circuit breaker state monitoring methods are single, the feature extraction algorithm is too traditional, the effective features cannot be accurately extracted from the monitoring data, and there is no complete fault diagnosis system, etc., the present invention proposes an online monitoring meth

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