Pressure Dependence and Size Effect of LN2Breakdown Characteristics Under Transient Thermal Stress
| Autor: | Hiroki Kojima, Naoki Hayakawa, Kazuki Ishida, Shigeki Isojima, Tatsuya Matsuoka, Minoru Kuwata |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Power apparatus Pressure dependence Liquid nitrogen Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Thermal bridge 0103 physical sciences Electrode Transient (oscillation) Electrical and Electronic Engineering Composite material 010306 general physics |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 26:1-4 |
| ISSN: | 1558-2515 1051-8223 |
| DOI: | 10.1109/tasc.2016.2532469 |
| Popis: | Electrical insulation of liquid nitrogen (LN 2 ) for a high-temperature superconducting (HTS) power apparatus can be categorized into two breakdown (BD) modes. One is the intrinsic or conventional BD of LN 2 . The other is the BD of LN 2 with transient bubbles, such as a quench. In this paper, the BD characteristics of LN 2 with transient bubbles were investigated for different LN 2 pressures and electrode diameters. Experimental results revealed that the BD strength of LN 2 with transient bubbles was lower than the intrinsic BD strength of LN 2 . The difference between the intrinsic BD strength and the BD strength with transient bubbles in LN 2 became smaller with the increase in the LN 2 pressure and electrode diameter. Furthermore, the BD characteristics of LN 2 with continuous bubbles were investigated and compared with the BD characteristics of LN 2 with transient bubbles. As a result, the insulation design of an HTS power apparatus in consideration of their quench condition will be rationalized than the design based on the continuous thermal stress. |
| Databáze: | OpenAIRE |
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