PROTECTION AND CONTROL METHOD FOR SPOT NETWORK POWER DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent malfunctioning and degradation of protection fuses P, F caused when protection circuit breakers Pro-CBs are opened by a protective relay 67L. SOLUTION: The central unit 1 receives 'On/Off' information on each feeder circuit breaker CB1-CB3 on the source side of the feeders L1-L3 and forwards the information to the terminal devices 2A, 2B. The terminal devices open the protection circuit breaker Pro-CB connector connected to the applicable feeder. The terminal device comprises a configuration that opens each protection circuit breaker Pro-CB through a reverse power relay operation from the customer bus bar to the feeder, a configuration that closes the protection circuit breaker Pro-CB based on the 'On' information of the feeder circuit breaker and the establishment of a secondary voltage on the network transformer NW-Tr, and a configuration that confirms the 'Off' or 'On' information of the feeder circuit breaker. It also has protection control that relates the line-up of terminal devices to the line-up of consumers on transmission lines in multiple systems.