Protection relay device for distribution equipment

摘要

A protection relay device for distribution equipment is provided with breakers respectively disposed at branches of a distribution system having the branches in a hierarchical structure, relays respectively disposed at the branches and detecting a short-circuit failure in a lower-rank section and outputting a detection signal, and a central control device receiving the detection signals output by the relays, determining a short-circuit failure section where a short-circuit failure has occurred from the detection signal received, and operating the relay of the branch corresponding to the short-circuit failure section to open the breaker corresponding to the relay.