Study on feature extraction and diagnosis method of inter-turn arc short circuit fault in dry-type air core reactor

ZHANG Bo; WANG Jianjun; HAN Wenfang; CHEN Feng; YAO Hui; ZOU Hui

doi:10.19666/j.rlfd.202108175

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Study on feature extraction and diagnosis method of inter-turn arc short circuit fault in dry-type air core reactor

更新时间：2025-09-28

- Study on feature extraction and diagnosis method of inter-turn arc short circuit fault in dry-type air core reactor
- Thermal Power Generation Vol. 50, Issue 12, Pages: 145-152(2021)
- 作者机构：
  
  1. 国网浙江省电力有限公司检修分公司
  2. 西安交通大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202108175
  CLC： TM47
- Published：2021
- 稿件说明：
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ZHANG Bo, WANG Jianjun, HAN Wenfang, et al. Study on feature extraction and diagnosis method of inter-turn arc short circuit fault in dry-type air core reactor[J]. Thermal power generation, 2021, 50(12): 145-152.
DOI：

ZHANG Bo, WANG Jianjun, HAN Wenfang, et al. Study on feature extraction and diagnosis method of inter-turn arc short circuit fault in dry-type air core reactor[J]. Thermal power generation, 2021, 50(12): 145-152. DOI： 10.19666/j.rlfd.202108175.

摘要

针对干式空心电抗器早期匝间短路故障

通过分析电抗器匝间电弧性短路过程中的状态参数变化规律

提出了基于时变参数模型的电抗器故障特征提取及诊断方法。首先建立了基于Mayr电弧模型的电抗器匝间短路故障的时变电路模型

并利用傅里叶变换分析了故障电抗器等效电感的频谱特性

发现其等效电感不再恒定而是存在周期性振荡。然后利用时变电路状态方程求解方法

分析在工频激励下故障电抗器输出电流的转移解、零状态响应及频谱特性

证明在匝间电弧的周期性短路过程中

故障电抗器输出电流中将激发出特定次数的谐波分量

分析电流谐波特性可对干式空心电抗器匝间短路故障进行诊断。通过对一起电抗器故障的电流互感器(CT)和电压互感器(PT)录波数据进行求解和分析

验证了本文提出的故障特征提取及诊断方法的可行性和有效性。

Abstract

A method for fault feature extraction and diagnosis of dry-type air core reactor is proposed based on a model with time-varying parameters

by analysis on the variation law of state parameters in early process of reactor turn to turn short circuit fault. First

a time-varying fault circuit model based on Mayr arc model is established

and the spectrum characteristics of the equivalent inductor of the reactor is analyzed by using Fourier transform. The equivalent inductor is no longer a constant but a periodic oscillating variate. Then

the transfer solution

zero-state response and frequency spectrum characteristics of the output current of the fault reactor under power frequency excitation voltage are analyzed by using the solution method of the time-varying circuit's state equation. It is proved that during the periodic short circuit of the interturn arc

the output current of the fault reactor will excite a certain number of harmonic components

analyzing the current harmonic characteristics can diagnose the interturn short circuit fault of the dry-type air air core reactor. By analyzing the CT and PT recorded data of a reactor fault

the feasibility and effectiveness of this proposed method for fault feature extraction and diagnosis of the dry-type air core reactor are confirmed.

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