| 摘要 |
Provided is an intelligent electronic device for protection, monitoring, controlling, metering or automation of electrical power system. The system, method and device of the present invention preserves current differential protection active during a breaker bypass or similar operation. A current differential protection system is coordinated by one relay (transfer), which simultaneously establishes and handles multiple two-terminal 87L protection zones with several relays. This “enhanced multiple-terminal system” requires no change to protection settings on any local or remote relays during a bypass process.
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