| 摘要 |
PURPOSE:To allow the positive interruption of sound phase in a short time by performing transfer interruption of a compensation reactor previously after interruption of faulty phase upon the occurrence of fault on a transmission line. CONSTITUTION:Upon the occurrence of single line-to-ground fault on an overhead transmission line 9, a line fault detection relay 13 in a ground transforming station functions to open a circuit breaker 3. If reclosing is not successful, transition is made to sound phase (residual phase) interruption processing. In other word, a compensation reactor transfer circuit breaker 1 delivers a transfer interruption signal on a signal transmission line 15 to a compensation reactor transfer circuit breaker 2. The circuit breaker 2 delivers an interruption command to the circuit breaker 7 for a compensation reactor 8 based on the transfer interruption signal thus paralleling off the compensation reactor 8. Since DC component disappears when the compensation reactor 8 is paralleled off an underground cable 11, sound phase can be interrupted positively in a short time. |
