短時間電圧昇降を用いた直読式残留電荷法によるCVケーブルの水トリー劣化診断

概要

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Water tree is one of the unique type of deterioration in XLPE cable, which is the primary cause of aging breakdown. Water tree, which bridges between conductor and shield, can be detected easily, such as DC leakage current method. However, 22kV class or above XLPE cable, most of breakdown occurs before water tree bridges, and there used to be no effective method for detecting non-bridged water tree.In this paper, weve found residual charge in harmful water tree relaxes quickly with AC voltage application. To detect this type of residual charge, weve developed new diagnosis method with “direct-detect type residual charge method" and “short-term voltage up-down method". This new method found to be very effective for diagnosing over 22kV class XLPE cable lines.
社団法人電気学会の論文
2006-04-01