Electrical insulation characteristics of paper-ice composite insulating system in liquid nitrogen

Author

Nagao, Masaru ; Nakanish, Takao ; Kataoka, Yasuyuki ; Kosaki, Massmitsu ; Shibata, Toshikazu ; Isojima, Shigeki

Author_Institution

Dept. of Electr. & Electron. Eng., Toyohashi Univ. of Technol., Japan

fYear

1999

fDate

1999

Firstpage

462

Lastpage

465

Abstract

In recent years, research work for realizing the high-temperature superconducting cable has advanced, where the development of electrical insulating system at cryogenic temperatures is one of the major researches. A composite insulating system made of insulating paper-LN ₂ has been studied as one of the electrical insulating systems on the high-temperature superconducting cable. In paper-LN₂ composite insulating system, where the conventional techniques are used, microscopic bubbles remain inside the paper, and the partial discharge could occur easily. In order to overcome this problem, we have been studying the paper-ice composite insulating system as a substitute for paper-LN₂ of cryogenic electrical insulating system in high-temperature super-conducting cables. We found that AC electric strength (Fb) of paper-ice composite insulating system was higher than that of paper-LN₂ composite insulating system. Furthermore we found the existence of self-healing breakdown. This paper describes the breakdown characteristics and partial discharge resistibility of the paper-ice composite insulating system in LN₂

Keywords

dielectric liquids; electric strength; insulating oils; nitrogen; partial discharges; AC electric strength; N₂; breakdown characteristics; composite insulating system; cryogenic electrical insulating system; cryogenic temperatures; electrical insulating system; electrical insulation characteristics; high-temperature super-conducting cables; high-temperature superconducting cable; liquid N₂; microscopic bubbles; paper-ice composite insulating system; partial discharge; self-healing breakdown; Cable insulation; Cryogenics; Dielectric liquids; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Ice; Nitrogen; Superconducting cables; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids, 1999. (ICDL '99) Proceedings of the 1999 IEEE 13th International Conference on

Conference_Location

Nara

Print_ISBN

0-7803-4759-5

Type

conf

DOI

10.1109/ICDL.1999.798972

Filename

798972