Effect of Load on Zero-Sequence Current in Low Resistance Grounding System with Complex Grounding Fault
The events that a single-line fault evolves into a multi-line fault are increasing recently in China Southern Power Grid. To make matters worse, zero-sequence current is closely related to the load in fault lines particularly when a complex multi-line single-phase grounding fault (SPGF) occurs in a low resistance grounding system. In this case, the load factor must be considered, otherwise it may result in unneglectable calculation errors. Therefore, a comprehensive theory analysis on the relation between zero-sequence current and load was carried out for complex multi-line SPGF firstly. On this basis, the influence mechanism of load variation on zerosequence currents was analyzed in detail, and some general rules were revealed at last. The conclusions summarized in this paper can provide a theoretical basis for improving the performance of zero-sequence current protection.
low resistance grounding system multi-line grounding fault zero-sequence current load effect
YU Lei TIAN Bing LEI Jinyong HAN Bowen WANG Gang
Electric Power Research Institute of CSG,Guangzhou,510080,China South China University of Technology,Guangzhou,510641,China
国际会议
西安
英文
1-5
2016-09-01（万方平台首次上网日期，不代表论文的发表时间）