标题：Analysis of single-phase earth fault in low resistance grounded distribution network containing DG
作者：Guo, Liwei ;Xue, Yongduan ;Zhang, Linli ;Xu, Bingyin ;Zhang, Zhongxia
作者机构：[Guo, Liwei ;Xue, Yongduan ;Zhang, Zhongxia ] College of Information and Control Engineering, China University of Petroleum (East China), Qingdao; 266 更多
来源：Dianli Xitong Zidonghua/Automation of Electric Power Systems
摘要：The distributed generator (DG) with different grounding modes will affect the characteristics of single-phase earth fault current. For a low resistance grounded distribution network, the grounding mode selection of DG is rather flexible and its influence on earth fault current is particularly complicated. Based on a low resistance grounded distribution network, a single-phase earth fault analysis model of distribution network containing rotary DG is established. Earth fault point current, sequence fault current and three phase fault current are analyzed respectively when DG adopts different grounding modes. Research results show that DG with the non-grounding mode has little influence on the characteristics of earth fault current and that when DG adopts the direct grounding mode or low resistance grounding mode, fault current will obviously increase or decrease, even reaching several hundred amperes from nil, which will affect the performance of existing earth fault protection and three-phase over-current protection. Research results can provide theoretical basis to configurations of earth fault protection and the neutral grounding mode selection of DG in low resistance grounded distribution network containing DG.
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