Circuit breaker fault diagnosis method based on Hilbert-Huang transform algorithm

Abstract

The invention discloses a circuit breaker fault diagnosis method based on a Hilbert-Huang transform algorithm. Empirical mode decomposition (EMD) is carried out on data signals, through the EMD on the signals, each intrinsic mode function (IMF) component is obtained, Hilbert transform is carried out on each IMF component, instantaneous amplitude and instantaneous frequency parameters are obtained, the amplitude and the instantaneous frequency are drawn to a Hilbert spectrum of energy, frequency and time distribution, the Hilbert spectrum is applied to analysis of nonlinear and nonstationary series, and a mirror extension method is adopted to suppress Hilbert transform endpoint effects. The testing result proves that the method has flexibility and effectiveness in vibration monitoring and analysis on the power system circuit breaker, the EMD is used for decomposing the signals to n IMF components, different frequency components in the vibration signal are in the decomposed IMF component, the frequency distribution in the IMF2 just contains a basic frequency part of a disconnecting switch, the analysis precision is improved, and the analysis steps are simplified.

Description

technical field [0001] The invention belongs to the field of power system monitoring, in particular to a method for diagnosing a circuit breaker fault based on a Hilbert-Huang transformation algorithm. Background technique [0002] In the power system, there are a large number of high-voltage circuit breakers, a large amount of maintenance, and high costs. Relevant statistics show that more than half of substation maintenance costs are spent on high-voltage circuit breakers, and 60% of them are used for minor repairs and routine maintenance of circuit breakers. In addition, according to statistics, 10% of circuit breaker failures are caused by incorrect maintenance. The overhaul of circuit breakers is completely disintegrated, which is time-consuming and expensive, and disintegration and reassembly may cause many new defects. In the current relatively conservative planned maintenance, the maintenance lacks certain pertinence. [0003] The long-term continuous online monito...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for circuit breaker fault diagnosis based on the Hilbert-Huang transform algorithm, aiming at solving the lack of pertinence in the planned maintenance of the existing circuit breaker, and the analysis accuracy and accuracy of the non-stationary signal of the circuit breaker. The problem of insufficient accuracy

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