Breakdown Characteristics of Cone-type ε-FGM Spacer for Gas Insulated Switchgears
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- Miyazaki Yusaku
- Department of Electrical Engineering, Nagoya University
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- Kojima Hiroki
- Department of Electrical Engineering, Nagoya University
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- Masui Hidetaka
- Materials Engineering Research Dept., Fuji Electric Co., Ltd.
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- Mitsudome Hiroshi
- Materials Engineering Research Dept., Fuji Electric Co., Ltd.
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- Yanase Hironori
- Materials Engineering Research Dept., Fuji Electric Co., Ltd.
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- Okamoto Kenji
- Materials Engineering Research Dept., Fuji Electric Co., Ltd.
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- Watanabe Keiji
- Functional Resin Department, Nagase ChemteX Co., Ltd.
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- Kato Katsumi
- Department of Electrical Engineering and Information Science, National Institute of Technology, Niihama College
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- Hayakawa Naoki
- Department of Electrical Engineering, Nagoya University
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<p>Gas insulated switchgears (GIS) are required to be downsized for the cost reduction, global warming mitigation and energy saving. For the downsizing of GIS, a novel electric field grading technique is highly expected. In order to solve this problem, we have been investigating the electric field control and relaxation technique by “functionally graded materials (FGM)” with spatial distribution of permittivity (ε-FGM) and/or conductivity (σ-FGM). In our previous works, post-type and truncated cone-type ε-FGM spacers were fabricated by “flexible mixture casting method” (FMC method). Compared with the conventional spacers (Uniform spacer) with a uniform permittivity distribution, the electric field grading effects of those ε-FGM spacers were simulated based on Volume-Time theory and verified by the measurement of their breakdown voltages.</p><p>In this paper, toward the application of ε-FGM to the actual GIS spacer, i.e. 30% reduction of spacer diameter or 50% reduction of cross section, we fabricated the 1/4-sized cone-type ε-FGM spacer. By grading the mixing ratio of SrTiO3 (εr=332) and SiO2 (εr=4) fillers in epoxy resin, a cone-type spacer with the diameter of 60 mm was fabricated by FMC method. The breakdown voltage of the ε-FGM spacer was measured in a tank filled with SF6 gas at 0.5 MPa-abs under the negative standard lightning impulse voltage by the step-up method. The maximum breakdown voltage of ε-FGM spacer was verified to be higher by 23% than the Uniform spacer with the same configuration and size of the ε-FGM spacer, which was also consistent with the simulated value.</p>
収録刊行物
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- 電気学会論文誌. A
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電気学会論文誌. A 141 (10), 546-551, 2021-10-01
一般社団法人 電気学会
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詳細情報 詳細情報について
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- CRID
- 1390008089766150272
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- NII論文ID
- 130008095812
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- NII書誌ID
- AN10136312
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- ISSN
- 13475533
- 03854205
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- NDL書誌ID
- 031753249
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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