变压器铁芯接地电流测量与特征分析.pdf

Journal of Electrical Engineering 电气工程, 2015, 3(4), 107-114 Published Online December 2015 in Hans. /journal/jee /10.12677/jee.2015.34014 Measurement and Characteristic Analysis of the Core Grounding Current of Transformer 1 1 1 2 Jiahui He , Yongqin Wang , Xin Tong , Qiyi Zhou 1 State Grid Hubei Electric Power Research Institute, Wuhan Hubei 2 State Grid Jingzhou Electric Power Supply Company, Jingzhou Hubei th th th Received: Nov. 19 , 2015; accepted: Dec. 5 , 2015; published: Dec. 9 , 2015 Copyright © 2015 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract In this paper, we analyze the core structure and the influence factors of the transformer. Through the study of the mechanism and circuit model of core grounding current, the harmonic component of the core is pointed out in the single-phase transformer. By selecting the typical transformer to carry out the measurement of the core, the existence of the harmonic in the core grounding current is verified, and the harmonic content is related to the structure of the transformer. At the same time, we analyze the current waveform of a transformer core with multi-point grounding trans- former. Then it is proved that the installation of resistance can limit the size of the current of the core, but does not change the content of its harmonics. Keywords Core Grounding Current, Multi-Point Grounding Fault, Harmonic 变压器铁芯接地电流测量与特征分析 1 1 1 2 贺家慧 ，王永勤，童 歆 ，周启义 1 国网湖