文献类型：期刊文献

中文题名：基于零序过滤的变压器励磁电感计算方法及涌流识别

英文题名：Transformer Excitation Inductance Calculation and Inrush Current Identification Method by Filtering the Zero Sequence Current

作者：古斌[1,2];谭建成[1];梁志坚[1]

机构：[1]广西大学电气工程学院,广西壮族自治区南宁市530004;[2]绍兴文理学院工学院,浙江省绍兴市312000

年份：2008

卷号：32

期号：11

起止页码：30

中文期刊名：电力系统自动化

外文期刊名：Automation of Electric Power Systems

收录：CSTPCD、、EI(收录号：20082811370979)、北大核心2004、Scopus(收录号：2-s2.0-46449114929)、CSCD2011_2012、北大核心、CSCD

语种：中文

中文关键词：变压器差动保护;励磁电感;励磁涌流;Yd接线变压器

外文关键词：transformer differential protection; excitation inductance; magnetic inrush current; power transformer with Y-delta connection

中文摘要：目前,以单相变压器T形电路为基础,利用等效瞬时电感的变化特性识别励磁涌流的方法效果较好,但计算励磁电感需使用变压器各侧绕组电流,对于Y,d接线变压器,如果电流互感器按典型方案配置,其三角形(△)侧绕组电流未知,故不能直接利用现有方法计算励磁电感。文中提出一种基于零序过滤的励磁电感计算方法,无需测量△侧绕组电流,只需利用△侧线电流就可计算出代表正、负序分量共同作用结果的励磁电感,且计算结果在变压器正常运行、故障及涌流时都有显著特征,可准确、有效地识别励磁涌流和内部故障状态。PSCAD仿真验证了该算法的准确性。

外文摘要：The conventional inrush current identification method by the variability of equivalent excitation inductance is based on the equivalent T-circuit of single phase transformer, which relies on the measurements of all winding currents. However, the delta winding side current of a Y-d connected transformer is not measurable by typically configured current transformers; therefore the method is not applicable. The paper proposes an algorithm by filtering the zero sequence current to calculate the excitation inductance of a Y-delta connection transformer. The algorithm can calculate the excitation inductance representing the combined effects of both positive and negative components by using the delta side line currents. The calculation results are significantly different in various operating conditions, therefore can identify internal faults or excitation inrushes effectively. PSCAD simulation results validate the method.