电网技术2018，Vol.42Issue(6)：1954-1959,6.DOI:10.13335/j.1000-3673.pst.2017.1613
基于偏度系数的变压器励磁涌流识别方法
Identification Method of Transformer Inrush Current Based on Skewness Coefficient
摘要
Abstract
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.关键词
变压器/差动保护/励磁涌流/偏度Key words
transformer/differential protection/inrush current/skewness分类
信息技术与安全科学引用本文复制引用
胡松,江亚群,黄纯..基于偏度系数的变压器励磁涌流识别方法[J].电网技术,2018,42(6):1954-1959,6.基金项目
国家自然科学基金项目(51677060).Project Supported by National Natural Science Foundation of China (51677060). （51677060）
