Post insulator fault identification method and device

Abstract

The application provides a post insulator fault identification method and device. The post insulator fault identification method comprises the steps: acquiring a vibration signal of a target post insulator; carrying out N-layer wavelet packet decomposition on the vibration signal to obtain N-layer wavelet trees; performing feature extraction on the N layers of wavelet trees to obtain an energy ratio of the energy value of each frequency band in the Nth layer of wavelet to the total energy value of the Nth layer of wavelet; determining whether the target post insulator fails or not according tothe energy ratio corresponding to each frequency band; if so, carrying out time-frequency analysis on the vibration information to obtain a wavelet time-frequency diagram; and determining the fault type of the target post insulator according to the wavelet time-frequency diagram. According to the provided method, the singular point of the vibration signal of the post insulator and the frequency band included by the singular point are analyzed by combining the wavelet packet energy with time-frequency analysis and thus spectral analysis is carried out on the abnormal condition of the signal jointly from the aspects of time domain and frequency domain, so that whether the post insulator has a fault or not and the fault type are identified quickly and accurately.

Description

technical field [0001] The present application relates to the technical field of post insulators, in particular to a method and device for fault identification of post insulators. Background technique [0002] Post insulator is a special insulation control, which was mostly used on utility poles in the early years, and gradually developed in large-scale high-voltage wire connection towers, which can play an important role in overhead transmission lines. However, due to the long-term problems of harsh working environment, quality deterioration and natural aging of post insulators, many faults have occurred, which seriously affected the safe operation of the power system. Therefore, the research on in-service detection of post insulators has important application value. [0003] In the prior art, the FFT (fast Fourier transform, fast Fourier transform) spectrum analysis method can be used to detect the post insulator. The Fourier transform transforms the signal from the time ...

AI Technical Summary

Problems solved by technology

[0005] This application provides a fault identification method and device for pillar insulators to solve the technical problem that the FFT spectrum analysis method requires multiple comparisons and analyzes to obtain the detection results, the calculation amount is large, the calculation time is long, and the technical problem that seriously affects the detection efficiency

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