Title :
Development of a hot-line diagnostic method for XLPE cables and the measurement results
Author :
Nakajima, A. ; Kashiwagi, N. ; Murata, T. ; Takahashi, S. ; Fukuda, O. ; Kitai, S. ; Tokumaru, K. ; Hirotsu, K.
Author_Institution :
Kansai Electr. Power Co. Inc., Osaka, Japan
fDate :
4/1/1989 12:00:00 AM
Abstract :
Hot-line diagnosis is needed to avoid breakdowns of XLPE (cross-linked polyethylene) cables due to water trees. The authors superposed a low DC voltage on an AC commercial voltage, measured the DC component of the current which passed through the insulation, and discovered that the DC component had a close relationship with the degradation caused by water trees. A hot-line diagnostic measurement system based on this DC superposition method was developed. The old cables that were removed and cables now in use were measured with the system; the results are reported
Keywords :
cable insulation; organic insulating materials; polymers; power cables; AC commercial voltage; XLPE cables; hot-line diagnostic method; low DC voltage; water trees; Cable insulation; Circuits; Current measurement; Degradation; Electric breakdown; Electrical resistance measurement; Oil filled cables; Power transformer insulation; Trees - insulation; Voltage measurement;
Journal_Title :
Power Delivery, IEEE Transactions on
