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Research on Communication-capable Ground-fault Protection System with Intelligence and Selectivity

Mu Longhua Meng Qinghai Liu Jianhua (China University of Mining & Technology 221008 China)  
Based on the overview of ground fault protection systems for underground LV distribution networks,this paper analyzes disadvantages of ground fault protection systems being used currently.The new criteria of ground fault protection,which are based on additional DC power supply and direction of zero sequence power,are put forward.These action criteria are of very good selectivity to ground fault.The intelligent ground fault protection devices using these new criteria are developed.These devices can form a communication capable ground fault protection system.Consequently,the selective ground fault protection that has no time difference and enhanced levels of safety for underground LV distribution networks can be realized.
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