1989 Fiscal Year Final Research Report Summary
Research on the suppression of bubble in liquid-solid composite insulation and the improvement of voltage endurance.
| Project/Area Number |
62460111
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
電力工学
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| Research Institution | NAGOYA UNIVERSITY, FACULTY OF ENGINEERING |
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Principal Investigator |
HORII Kenji NAGOYA UNIV. FACULTY OF ENG. PROFESSOR, 工学部, 教授 (70023223)
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| Co-Investigator(Kenkyū-buntansha) |
MIZUNO Yukio TOYOHASHI UNIV. OF TECH. ASSISTANT, 第3工学系, 助手 (50190658)
SHIMIZU Noriyuki NAGOYA UNIV. FACULTY OF ENG. ASSISTANT PROF., 工学部, 講師 (20126866)
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| Project Period (FY) |
1987 – 1989
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| Keywords | cryogenic temperature / electric insulation / liquid-solid composite insulation / degradation of insulation / partial discharge / inside cooling conductor / BUBBLE |
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| Research Abstract |
About the effect of bubble on the electric breakdown of cryogenic liquid insulation, the electric strength of liquid nitrogen with bubble was the average value of them between the liquid without bubble and the vapor, and reduced with the increase of bubble. It was explained by the volume theory on the distribution of weak points by bubbles. The performance of bubble in the high electric field was observed. The bubble in liquid nitrogen was deformed by stretching to the direction of field and made a bridge between electrodes with internal discharge in bubble. The degradation of composite insulation by partial discharge in liquid helium was compared it in liquid nitrogen. The degradaftion by partial discharge in void and the layer effect in composite insulation was studied experimentally. Finally the new insulation system with suppression of bubble in liquid-solid composite insulation was proposed and tested experimentally with model insulation system. The idea is to separate the coolant of cryogenic liquid inside hollow conductor with insulation of solid without liquid.
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