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The Study on the Logical Coor dination of the Line Protection Relay with the Circuit Breaker in 220 kV System

From a accident happed in the electrical system,this paper carefully analysis the reason of the enclosures failure to operate,and also make an in-depth study on the coordination problem of the line protection relay with the Siemens circuit breaker which widely used in the system. The countermeasures are implemented to prevent the breakers recluse repelling operation,and raised the protection action reliability after the breaker’s circuits were modified.
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