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The Analysis of the Relay Operation Due to the Opened Current Circuit

WANG Wei1,YE Yuan-bo2(1.Hefei Power Supply Company,Hefei 230022,China;2.Anhui Electrical Power Dispatch & Communication Center,Hefei 230022,China)  
Current differential relay is widely used in element protection.It is very important to ensure the current circuit in correct status for the current differential relay.From a accident that current open circuit results in the trip of the 500kV transformer,this paper carefully analyzes the reason of operation of the current differential relay and proposes technical ways to prevent such accident.
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