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Keywords

optical voltage transformer;fault traveling wave;wavefront calibration;noise interference

Abstract

To address the restricted frequency band of existing electromagnetic potential transformers in transmitting fault traveling wave signals and the susceptibility of fault traveling wavefront calibration to noise interference，a fault traveling wavefront calibration method based on an improved optical voltage transformer is proposed.Firstly，the demodulation and conditioning circuits of the optical voltage transformer are improved to amplify fault traveling wave signals while reducing the influence of birefringence interference signals，thereby enhancing the transmission accuracy of traveling wave signals.Subsequently，the improved complete ensemble empirical mode decomposition with adaptive noise （ICEEMDAN ） is introduced to decompose the transmitted fault traveling wave signals，reducing noise interference in the fault traveling wave signals.Combined with the minimum entropy deconvolution （MED） algorithm，the decomposed fault traveling wave signals are enhanced to sharpen the fault pulse steepness，highlighting the characteristics of the fault traveling wavefront and achieving its calibration.Finally，simulation and experiment are conducted.The results show that the improved optical voltage transformer circuit can transmit signals in the frequency band from 10 kHz to 1 MHz，meeting the requirements for the transmission accuracy of fault traveling wave signals.The proposed method for fault traveling wavefront calibration is not affected by strong noise and can accurately calibrate the traveling wavefront.

DOI

10.19781/j.issn.1673-9140.2025.04.004

First Page

38

Last Page

49

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