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《Electric Power Automation Equipment》 2011-06
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Intelligent trip strategy for wide-area backup protection

LI Feng1,WANG Laijun1,WEN Minghao2,MA Yunlong1,WANG Yi2(1.Xuchang Power Supply Company,Xuchang 461000,China;2.Electric Power Security and High Efficiency Lab,Huazhong University of Science and Technology,Wuhan 430074,China)  
As the invalidation of IED(Intelligent Electronic Device) or the failure of communication network will decrease the selectivity of wide-area protection,an intelligent trip strategy is proposed for it.The fault detection is carried out for the backup protection zone formed by two primary protection zones around the measuring point which loses information.If a fault is detected,the breaker of the measuring point is tripped through the communication network of the wide-area protection system.The fault detection is then carried out separately for two primary protection zones and the boundary breaker of the primary protection zone with internal fault is tripped.It effectively avoids the action failure of the primary protection zones related to the measuring point which loses information,as well as the improper action of the backup protection zone.Analysis shows that,the proposed intelligent trip strategy with an additional breaker trip and fault detection improves the selectivity of the wide-area backup protection significantly.
【Fund】: 国家自然科学基金重点资助项目(50837002)~~
【CateGory Index】: TM771
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