Study on Space Charge Behavior Related to the Residual Charge Method for Diagnosing Water Tree Degradation of Polymer Insulated Power Cables
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- Hozumi Naohiro
- Dept. of Electrical & Electronic Eng., Aichi Institut of Technology
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- Uchida Katsumi
- Electric Power R & D Center, Chubu Electric Power Co., Inc.
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- Murakami Yoshinobu
- Dept. of Electrical & Electronic Eng., Toyohashi University of Technology
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- Nagao Masayuki
- Dept. of Electrical & Electronic Eng., Toyohashi University of Technology
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- Teyssedre Gilbert
- CNRS, Paul Sabatier University
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- Laurent Christian
- CNRS, Paul Sabatier University
Bibliographic Information
- Other Title
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- 電力ケーブルの水トリー劣化診断のための残留電荷法に関連する空間電荷挙動
- デンリョク ケーブル ノ ミズ トリー レッカ シンダン ノ タメノ ザンリュウ デンカホウ ニ カンレンスル クウカン デンカ キョドウ
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Abstract
The residual charge method is expected to be a powerful tool to detect the water tree degradation of polymer insulated power cables. In this method, DC voltage is firstly applied to electrify the degraded region. Some of the charges would be deeply trapped and stayed stably, even after the DC voltage is removed and the system is short circuited. AC voltage is subsequently applied in order to release the trapped charges. The DC component current, or the integration of it, is considered to have a correlation with the degree of degradation. This paper discusses the detail of the mechanism by which the DC component signal appears. The specimen was carefully prepared so that it contained water trees with uniform length. Space charge measurement was performed by pulsed electroacoustic method. The decay process of charges under AC voltages was interpreted into the energy depth at which the charge had been trapped, assuming that the charges were detrapped by the process of Poole-Frenkel type. It was suggested that the charges trapped between 0.8-1.2 eV can be detected as the DC component current. The shallower would be released by thermal energy at ambient temperature while the system was short circuited. The deeper would not be released by realistic AC voltages. The result showed that the transition of DC component current in the residual charge method represents the behavior of space charges having been trapped at deferent energy levels. It is believed that the results give useful information to apply the method to power cables.
Journal
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- IEEJ Transactions on Fundamentals and Materials
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IEEJ Transactions on Fundamentals and Materials 128 (2), 67-74, 2008
The Institute of Electrical Engineers of Japan
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Details 詳細情報について
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- CRID
- 1390001204593358592
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- NII Article ID
- 10021129352
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- NII Book ID
- AN10136312
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- BIBCODE
- 2008IJTFM.128...67H
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- ISSN
- 13475533
- 03854205
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- NDL BIB ID
- 9361094
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed
