Summation Impedance Relay with High Resistance Grounding Faults Identification Capability
He Shan1, 2, Lin Xiangning1, Zhang Rui1, Tong Ning1, Li Zhengtian1
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 2. Shenzhen Power Supply Bureau Co. Ltd Shenzhen 518010 China
Abstract：This paper focuses on building a backup protection to remove single-phase high resistance grounding faults specially. By integrating the information of measured impedances at both ends of the line, it is shown that the summations are very different when fault occurs in the region and out of the region. A novel summation impedance relay is then proposed, where the steady-state values of measured impedances are collected and the criterion is simple. Simulation results prove that the proposed relay can remove high resistance grounding faults and avoid mal-operation. The proposed relay depends little on the change of system operation mode, and is independent of the open phase operation of lines. The requirement of data synchronization is extremely low. Its operating ability under the condition of high grounding resistance is much better than those of distance pilot protection and pilot differential protection. The summation relay can provide effective supplement for the existing main protection.
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2016, Vol. 31 
