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《Electrical Equipment》 2007-11
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The Technology Analysis of Earth Fault Protection in Resonant Grounded System

XUE Yongduan1,XU Bingyin1 ,DU Jingyuan2 (1. Shandong University of Technology, Zibo 255049, China; 2. Shandong Jinan Power Supply Company, Jinan 250012, China)  
The basic principle of several new methods of earth fault protection in resonant grounded system are introduced, such as harmonic method, active component method, injecting signal method, the shunt resistance method, the remnant current increment method, the small disturbance method, the traveling wave method, the initial polarity method, the transient signals method, integrated method and so on. The performances of these methods about reliability, security, and serviceability, so on are analyzed. From the application in field, the active methods represented by the shunt resistance method and the passive methods based on transient signals have the greatest development potential. For the stable earth fault, the effect of the shunt resistance method is better; for the intermittency earth fault and the arc earth fault, the transient signals method is better. In the same time, the transient signals method has the obvious advantage in the system security, economical serviceability and so on. But the principle of the transient signals method is not simple as the shunt resistance method, so the users accept it with a little difficulty. These methods should be selected seriously according to the practical conditions.
【CateGory Index】: TM862
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