| 摘要 |
PROBLEM TO BE SOLVED: To accurately perform a positive operation and a non-operation against an external failure, and also to accurately perform the positive operation against an internal failure, in a distance relay for protecting a power system having capacitors in series on a power cable. SOLUTION: A steady-state voltage Vpo1 before the occurrence of the failure in the power system is detected, a voltage Vop at the time of the occurrence of the failure is detected, and the power system is protected corresponding to a phase difference between the steady-state voltage Vpo1 before the occurrence of the failure and the voltage Vop at the time of the occurrence of the failure. A distance relay device 8D is used for the protection of the power system having the capacitors 4, 21, thus accurately performing the positive operation and the non-operation against the external failure, and the positive operation against the internal failure. COPYRIGHT: (C)2004,JPO
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