NDLI: Development of on-site diagnostic method for XLPE cable by harmonics in AC loss current

Content Provider	IEEE Xplore Digital Library
Author	Tsujimoto, T. Nakade, M. Yagi, Y. Adachi, K. Tanaka, H.
Copyright Year	2003
Description	Author affiliation: Tokyo Electr. Power Co., Kanagawa, Japan (Tsujimoto, T.; Nakade, M.)
Abstract	Water tree degradation in XLPE cables used for under-ground distribution or transmission lines is a serious problem. Some diagnostic methods to detect water tree degradation have been developed, but the sensitivity of them is not sufficient for 22 kV/66 kV class XLPE cables. The reason is that conventional methods are based on detecting signals from water trees bridged over insulation layer. In case of 22 kV/66 kV class cables, even unbridged water trees will be harmful because of their higher operating stress, so that there are demands on highly reliable new diagnostic methods for such class cables. We found that water tree in XLPE insulation generates harmonics in the AC loss current because of the non-linear voltage-current characteristics of itself. And, we found that the harmonics in AC loss current are closely correlated to water tree growth, break down strength, and the other aspects of the degradation. We made the on-site diagnostic system based on those results, and have applied to the actual 66 kV XLPE cable lines more than 22. As the result, we confirmed that it was suitable for the diagnostic method for 22 kV/66 kV class cables.
Sponsorship	IEEE Dielectrics & Electrical Insulation Soc. IEE Japan
Starting Page	73
Ending Page	76
File Size	265624
Page Count	4
File Format	PDF
ISBN	0780377257
ISSN	10817735
DOI	10.1109/ICPADM.2003.1218356
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-06-01
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Trees - insulation Degradation Power cables Underwater cables Transmission lines Signal detection Stress AC generators Character generation Voltage
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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