BRIDGING WATER TREE POSITION STANDARDIZING METHOD AND BRIDGING WATER TREE POSITION STANDARDIZING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a bridging water tree standardizing method and a bridging water tree position standardizing apparatus in which only a deteriorated portion can be recovered and a power failure time/recovering work process can be reduced by standardizing a position of a bridging water tree.SOLUTION: A DC voltage is applied between a core wire 11 and a copper tape 13 of a CV cable 10 by using a DC power source 21. A delay time is determined by using both a first current detection circuit 22 provided between one end of the copper tape 13 and a (+) side of the DC power source 21 and second current detection means 23 provided between another end of the copper tape 13 and the (+) side of the DC power source 21, the delay time being a differential between a first arrival time until a discharge current I1 generated at a bridging water tree position by applying the DC voltage arrives at the first current detection circuit 22 and a second arrival time until a discharge current I2 arrives at the second current detection circuit 23. A position of a bridging water tree is then standardized from the determined delay time.