| 摘要 |
PROBLEM TO BE SOLVED: To provide a bus protection relay device which is provided with time cooperation due to the auxiliary relay contact and a measure such as the duplicated contacts to improve reliability, because a circuit for terminating the secondary circuit of a current transformer is provided as the hardware to a means for forcibly setting an input current of a divided relay to zero, and thereby switching of the secondary side of the current transformer is required. SOLUTION: In the bus protection relay apparatus, bus-tie current transformers 4, 5 for bus protection are installed in one side of a circuit breaker 3 provided in a bus-tie circuit connecting the buses 1, 2, and the bus is protected with the simultaneous protection system and divided protection system. When the bus-tie circuit breaker 3 is turned 'OFF' and the simultaneous protection relay 14 operates, an input current from the bus-time current transformers 4, 5 is forcibly set to zero with a divided protection relay software process 17. |
