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《Automation of Electric Power Systems》 2003-11
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RESEARCH ON FAST OPERATING BACKUP PROTECTION

Xiong Xiaofu, Zhou Jiaqi, Zhao Xia, Yang Yunguo (Chongqing University, Chongqing 400044, China)  
Setting backup protection according to step principle will always lead to long fault clearing time of relays in backbone network as well as power plants, and further a threat against security of power network. This article presents a new idea of fast operating backup protection system. Basic structure and operation principle of this fast backup relay system in a substation are described, and then logical operation equations are established. Using this method, the backup relay in substations will operate within 1 s, and thus largely reduce the fault clearing time of backup relays of the whole network.
【CateGory Index】: TM771
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