基于小波包分解的干式空心电抗器故障检测方法研究

陈裕田; 罗日成; 俞乾; 王昱彤; 刘娟; 陈子琪; 高凯

基于小波包分解的干式空心电抗器故障检测方法研究

1. 长沙理工大学电气与信息工程学院;
2. 国网湖南省综合能源服务有限公司

详细信息

作者简介:
陈裕田(1999—),男,硕士研究生,主要研究方向为基于小波包分解的干式空心电抗器故障检测

通讯作者:
罗日成(1969—),男,教授,主要从事电力设备的在线监测与故障诊断、阵列信号处理的研究

中图分类号: TM47
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出版历程
- 收稿日期: 2024-05-16
- 刊出日期: 2024-08-27

Research on Fault Detection Method of Dry-Type Air-Core Reactor Based on Wavelet Packet Decomposition

1. School of Electrical and Information Engineering, Changsha University of Science and Technology;
2. State Grid Hunan Integrated Energy Service Co., Ltd.

摘要

摘要: 针对干式空心电抗器匝间短路故障频繁发生的问题，通过分析35 kV干式空心并联电抗器匝间短路过程中状态参数的变化，提出了基于小波包分解的干式空心电抗器故障特征提取及检测方法。首先建立了电抗器的正常、故障（同股匝间短路及异股匝间短路）状况下的电路模型，给出了各电气参数的计算方法，搭建了MATLAB/Simulink仿真电路，运用小波包分解方法分析了电抗器正常、故障状况下流经电抗器总电流的变化规律；其次，根据分解结果，提取和分析各个频段节点信号的能量特征，通过相同频段节点信号的差异对比，实现了电抗器运行状态判断；最后针对电抗器匝间短路时初期电气量变化不明显导致误判的问题，运用熵权法对电流平均值的差值和余弦相似度进行加权计算，提高了故障检测的精度。实验结果表明：将故障工况下的电流进行小波包分解能准确识别匝间短路故障，可以为干式空心电抗器的运行提供理论参考。
- 干式空心电抗器 /
- 绝缘检测 /
- 小波包分析 /
- 微弱缺陷
Abstract: Aiming at the problem of frequent occurrence of inter-turn short circuit fault of dry-type air-core reactor, by analyzing the changes of state parameters during the inter-turn short circuit of 35 k V dry-type air-core shunt reactor, a fault feature extraction and detection method of dry-type air-core reactor based on wavelet packet decomposition is proposed. Firstly, the circuit model of the reactor under normal and fault conditions（inter-turn short circuit of the same strand and inter-turn short circuit of different strands）is established. The calculation methods of each electrical parameter are given, and the MATLAB/Simulink simulation circuit is built. The wavelet packet decomposition method is used to analyze the variation law of the total current flowing through the reactor under normal and fault conditions. Secondly, according to the decomposition results, the energy characteristics of each frequency band node signal are extracted and analyzed and by comparing the differences of node signals in the same frequency band, the operation state of the reactor is judged. Finally, in view of the problem of misjudgment caused by unclear initial electrical quantity changes during the inter-turn short circuit of the reactor, the entropy weight method is used to weight and calculate the difference of the average current value and the cosine similarity, which improves the accuracy of fault detection. The experimental results show that the wavelet packet decomposition of the current under the fault condition can accurately identify the inter-turn short circuit fault, which can provide a theoretical reference for the operation of the dry-type air-core reactor.
- dry-type air-core reactor /
- insulation detection /
- wavelet packet analysis /
- weak defects

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