Identification Method of Transformer Inrush Current Based on Skewness Coefficient

被引：0

作者：

Hu S. ^{[1
]}

Jiang Y. ^{[1
]}

Huang C. ^{[1
]}

机构：

[1] College of Electrical and Information Engineering, Hunan University, Changsha, 410082, Hunan Province

来源：

Jiang, Yaqun (yaqunjiang@21cn.com) | 1954年 / Power System Technology Press卷 / 42期

基金：

中国国家自然科学基金;

关键词：

Differential protection; Inrush current; Skewness; Transformer;

D O I：

10.13335/j.1000-3673.pst.2017.1613

中图分类号：

学科分类号：

摘要：

This paper analyzes difference of waveform characteristics and probability distribution between inrush current and fault current waveforms, and proposes an identification method of inrush current based on skewness coefficient of transformer differential current. Sine characteristics of internal fault current skewness is negative and remains unchanged, and absolute value of full power cycle skewness is equal to half power frequency cycle skewness; while inrush current is positive, and there is a big difference with half cycle skewness. The skewness coefficients of sampling values of differential current in one power frequency cycle and half power frequency cycles are calculated, and thus the inrush current can be quickly identified. This method is simple in principle and small in calculation quantity. It can recognize inrush current accurately and effectively, and has strong ability of noise immunity and anti-interference. Simulation results verify feasibility and superiority of the proposed method. © 2018, Power System Technology Press. All right reserved.

引用

页码：1954 / 1959

页数：5

共 18 条

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