| 摘要 |
PROBLEM TO BE SOLVED: To provide a current differential relay system, which suppresses unwanted detection of defective monitoring of differential current, even when defective transmission on a transmission line extends over a plurality sections. SOLUTION: On the basis of the outputs of a defective transmission recognizing means 101, which recognizes that transmission on a transmission line is defective, when the member of current differential relay devices operable in a loop power transmission line becomes unequal to the number of preset operating terminals, and relay locking means 111-116 which lock relay outputs of fault judgment results of current differential relays at terminals which are influenced by defective transmission of the transmission line, outputs of the differential current monitor and output means 121-126 of terminals to be influenced by the defective transmission are deterred. Consequently, unwanted defective monitor outputs 171-176 are prevented from being produced. |
