Experimental Study on Dependence of Bow-tie Trees on Nuclei
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- Kumazawa Takao
- Energy Applications R&D Center, Chubu Electric Power Co., Inc.
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- Morinaga Seiji
- Tatsuta Electric Wire & Cable Co., Ltd.
Bibliographic Information
- Other Title
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- ボウ・タイ状水トリーの発生核依存性に関する実験的考察
- ボウ ・ タイジョウスイ トリー ノ ハッセイカク イソンセイ ニ カンスル ジッケンテキ コウサツ
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Abstract
Bow-tie trees(BTTs) generated by contaminants, e.g., metal, amber(over cured resin), carbon, voids in insulators of XLPE cables still remain a factor contributing to the deterioration. In order to examine the influence of contaminants on the behavior of BTT generation, we performed several experiments using XLPE samples containing copper powder, finely divided over cured resin or micro voids as BTT nuclei. As a result of the experiments, in spite of the great difference in the distribution of particle diameter, the shape and permittivity of the nuclei, each sample containing the copper powder or the over cured resin showed a common dependence of the number of BTTs on the mean size of BTT nuclei. Consequently, there is no fundamental difference in these nuclei. We consider that the lower limit of the nuclei size suitable for BTT generation is determined by the local electric field at the tip of the nuclei and the upper limit of them is determined by the extent of the stagnation of ions around the nuclei. Moreover, we consider that the increase in the mean size of BTTs with the initial water content was caused by a relaxation effect on the local electric field due to absorbed water in XLPE samples.
Journal
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- IEEJ Transactions on Fundamentals and Materials
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IEEJ Transactions on Fundamentals and Materials 133 (10), 543-549, 2013
The Institute of Electrical Engineers of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282679576942848
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- NII Article ID
- 10031200962
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- NII Book ID
- AN10136312
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- ISSN
- 13475533
- 03854205
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- NDL BIB ID
- 024946562
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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