Application of the Complex Values of the Frequency Response in Fault Diagnosis of Power Transformer

LIU Yunpeng; CHENG Huaihao; HU Huan

doi:10.13296/j.1001-1609.hva.2019.07.002

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Application of the Complex Values of the Frequency Response in Fault Diagnosis of Power Transformer

更新时间：2025-04-26

- Application of the Complex Values of the Frequency Response in Fault Diagnosis of Power Transformer
- High VoltageApparatus Vol. 55, Issue 7, Pages: 10-14+26(2019)
- 作者机构：
  
  华北电力大学河北省输变电设备安全防御重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2019.07.002
  CLC： TM41
- Published：2019
- 稿件说明：
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[1]刘云鹏,程槐号,胡焕.频率响应复数值在电力变压器故障诊断中的应用[J].高压电器,2019,55(07):10-14+26.

LIU Yunpeng, CHENG Huaihao, HU Huan. Application of the Complex Values of the Frequency Response in Fault Diagnosis of Power Transformer[J]. High VoltageApparatus, 2019, 55(7): 10-14+26.
[1]刘云鹏,程槐号,胡焕.频率响应复数值在电力变压器故障诊断中的应用[J].高压电器,2019,55(07):10-14+26. DOI： 10.13296/j.1001-1609.hva.2019.07.002.

LIU Yunpeng, CHENG Huaihao, HU Huan. Application of the Complex Values of the Frequency Response in Fault Diagnosis of Power Transformer[J]. High VoltageApparatus, 2019, 55(7): 10-14+26. DOI： 10.13296/j.1001-1609.hva.2019.07.002.

摘要

频率响应分析法是现场用于检测电力变压器内部机械缺陷的重要方法。目前有几种不同的、用于分析频率响应法结果的方法

其中最常用的就是利用数值指标（如相关系数、均方差等）得出不同频响曲线之间的差异性。然而

传统的数值指标都只使用了频率响应结果的幅值

其对于变压器绕组微小变形的检测灵敏度不够理想。因此

文中提出了一种同时考虑频率响应结果幅值和相位的数值指标及一种改进传统数值指标的方法;然后通过实验得到了不同轴向微小变形程度绕组的频率响应数据;最后将不同的数值指标应用于实验所得数据并进行了对比试验

验证了所提出数值指标及改进数值指标的优越性。试验结果表明

同时考虑频率响应结果幅值和相位可以提高频率响应分析法对于绕组微小变形的检测灵敏度

有利于提高电力变压器故障诊断水平。

Abstract

Frequency response analysis（FRA）is an important technique for detecting the mechanical defects insidea power transformer. There are several methods to interpret the FRA results

and the most common method is usingthe numerical index（such as correlation coefficient

mean square deviation

etc）to obtain the degree of deviationbetween different frequency response curve. However

the traditional numerical indices use only the magnitude re-sponse of the FRA results

which is not accurate enough for the detection of minor winding deformations. Therefore

a numerical index considering both the amplitude and phase of frequency response results and a method to improvethe traditional numerical index are proposed. Then the frequency response data of different axial minor deformationwindings are obtained through experiments. Finally

different numerical indices are applied to the experimental dataand the results are compared to verify the superiority of the proposed numerical indices and the improved numericalindices. The results show that

the sensitivity of the frequency response analysis method to the minor winding defor-mations could be improved by considering both magnitude response and phase response of the FRA results

which isbeneficial to improve the level of power transformer fault diagnosis.

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