Identification of Transformer Inrush Current and Internal Fault Current on the Basis of Wavelet Analysis

YAN Yi-hong; CHEN Jian-yun

doi:10.13296/j.1001-1609.hva.2010.12.018

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Identification of Transformer Inrush Current and Internal Fault Current on the Basis of Wavelet Analysis

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- Identification of Transformer Inrush Current and Internal Fault Current on the Basis of Wavelet Analysis
- High VoltageApparatus Vol. 46, Issue 12, Pages: 74-77(2010)
- 作者机构：
  
  华东交通大学电气与电子工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2010.12.018
  CLC： TM407
- Published：2010
- 稿件说明：
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[1]严屹宏,陈剑云.基于小波分析的变压器励磁涌流和内部故障电流识别[J].高压电器,2010,46(12):74-77.

YAN Yi-hong, CHEN Jian-yun. Identification of Transformer Inrush Current and Internal Fault Current on the Basis of Wavelet Analysis[J]. High voltageapparatus, 2010, 46(12): 74-77.
[1]严屹宏,陈剑云.基于小波分析的变压器励磁涌流和内部故障电流识别[J].高压电器,2010,46(12):74-77. DOI： 10.13296/j.1001-1609.hva.2010.12.018.

YAN Yi-hong, CHEN Jian-yun. Identification of Transformer Inrush Current and Internal Fault Current on the Basis of Wavelet Analysis[J]. High voltageapparatus, 2010, 46(12): 74-77. DOI： 10.13296/j.1001-1609.hva.2010.12.018.

摘要

探讨了一种基于离散小波变换（DWT）及其多分辨率分析（MRA）的识别励磁涌流和内部故障电流并利用小波熵作为判据的方法。在MATLAB中通过对变压器空载合闸和匝间短路进行仿真

并利用该方法对不平衡电流进行了分析。结果表明

该方法能够可靠、快速地识别出励磁涌流和内部故障电流。

Abstract

Based on discrete wavelet transform（DWT） and multiresolution analysis（MRA）

a method to identify the inrush current with the internal fault current is proposed

.And combining wavelet analysis with entropy theory

the new-type protection criterion formula is presented.The simulation models of no load switching and turn-to-turn fault are established by MATLAB. Utilizing the method

the unbalance current signals under the two abnormal operation conditions are analyzed.The results show that the new-type criterion

based on wavelet entropy

can identify the differences between inrush current and internal fault reliably and rapidly.

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