Novel Method to Identify the Inrush Current Based on Pearson Correlation Coefficient

YAN Fusong; LI Chaohui

doi:10.13296/j.1001-1609.hva.2016.08.009

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Novel Method to Identify the Inrush Current Based on Pearson Correlation Coefficient

更新时间：2025-04-26

- Novel Method to Identify the Inrush Current Based on Pearson Correlation Coefficient
- High VoltageApparatus Vol. 52, Issue 8, Pages: 52-56+63(2016)
- 作者机构：
  
  鲁东大学
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2016.08.009
  CLC： TM407
- Published：2016
- 稿件说明：
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[1]闫富松,李朝晖.一种基于皮尔逊相关系数识别变压器励磁涌流的方法[J].高压电器,2016,52(08):52-56+63.

YAN Fusong, LI Chaohui. Novel Method to Identify the Inrush Current Based on Pearson Correlation Coefficient[J]. High voltageapparatus, 2016, 52(8): 52-56+63.
[1]闫富松,李朝晖.一种基于皮尔逊相关系数识别变压器励磁涌流的方法[J].高压电器,2016,52(08):52-56+63. DOI： 10.13296/j.1001-1609.hva.2016.08.009.

YAN Fusong, LI Chaohui. Novel Method to Identify the Inrush Current Based on Pearson Correlation Coefficient[J]. High voltageapparatus, 2016, 52(8): 52-56+63. DOI： 10.13296/j.1001-1609.hva.2016.08.009.

摘要

变压器空载合闸时产生的励磁涌流可能会导致差动保护误动

因此正确识别励磁涌流和内部故障是变压器保护的主要问题。文中首先分析了变压器励磁涌流和内部故障时基波与二次谐波幅值的动态变化趋势

并基于两者幅值的变化趋势提出了一种基于相关系数的识别方法:当两者的相关系数大于某一门槛值时

即判为励磁涌流

否则判为内部故障。PSCAD/EMTDC仿真结果验证了新方法在性能上的优越性。

Abstract

The differential protection may mis-operate due to the inrush current that caused by transformer energization with no-load. Therefore

the most important issue for the transformer protection is to discriminate the inrush current from internal fault current. This paper first analyzes the change trend of primary and the second harmonic current under inrush current and internal fault. Then

a novel method based on the change trend is proposed. If the coefficient is larger than a setting value

it is inrush current. Otherwise

it is internal fault. The simulation results based on PSCAD/EMTDC presents its superior performance of the method.

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