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DISTRIBUTION LINE ACCIDENT ZONE SELECTING AND BLOCKING DEVICE AND DISTRIBUTION LINE ACCIDENT ZONE SELECTING AND BLOCKING METHOD
DISTRIBUTION LINE ACCIDENT ZONE SELECTING AND BLOCKING DEVICE AND DISTRIBUTION LINE ACCIDENT ZONE SELECTING AND BLOCKING METHOD
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机译：配电线路事故区域选择与阻塞装置及配电线路事故区域选择与阻塞方法
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摘要
PROBLEM TO BE SOLVED: To obtain a distribution line accident zone selecting and blocking device for selectively blocking a distribution line accident zone which enables the discrimination of an earth fault accident zone and blocking only the accident zone without measuring both a zero-phase current and a zero-phase voltage in each zone of a distribution line, and accordingly for reducing measuring cost, and a distribution line accident zone selecting and blocking method.;SOLUTION: The distribution line 5 is sectioned by zone switches 4 in the number of n, while CTs (current transformers) 2 in the number of n are provided corresponding to the individual zone switches 4. A switch blocking instruction preparing part 1 receives a measured value of a phase current from each CT 2 via a communication circuit 3 and calculates a difference in the zero-phase current between the adjacent CTs 2. In the case that some of absolute values of the differences exceed a threshold value, a blocking instruction is transmitted to the zone switch 4 of the concerned zone.;COPYRIGHT: (C)2009,JPO&INPIT
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