| 摘要 |
PROBLEM TO BE SOLVED: To provide a current differential protective relay capable of minimizing a decrease in dynamic sensitivity and preventing malfunction from occurring even when CT induction to another phase occurs. SOLUTION: A current differential protective relay includes: an induction suppression amount calculation part 81 for calculating an induction suppression amount KH controlling a suppression amount IR1 of another phase calculated by using a current In induced to a secondary side of a CT of the other phase in accordance with the current flowing in a primary side of the CT of its own phase on the basis of the suppression amount IR1 of its own phase; and a suppression amount calculation part 61 for calculating the suppression amount IR used for ratio differential calculation of its own phase on the basis of the induction suppression amount KH output from the induction suppression amount calculation part 81 of the other phase and the suppression amount IR1 of its own phase. COPYRIGHT: (C)2013,JPO&INPIT |
