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Solid insulated switchgear and investigation of its mechanical and electrical reliability
Author(s) -
Sato Junichi,
Kinoshita Susumu,
Sakaguchi Osamu,
Miyagawa Masaru,
Shimizu Toshio,
Homma Mitsutaka
Publication year - 2011
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.21057
Subject(s) - switchgear , materials science , epoxy , composite material , molding (decorative) , dielectric strength , reliability (semiconductor) , dielectric , mechanical engineering , engineering , power (physics) , physics , quantum mechanics , optoelectronics
SF 6 gas is widely employed in medium‐voltage switchgear because of its high insulation reliability and down‐sizing ability. However, SF 6 gas was placed on the list of greenhouse gases under the Kyoto Protocol in 1997. Since then, research on low‐SF 6 or SF 6 ‐free insulation has been carried out actively. Therefore, we focused on solid materials with higher dielectric strength than SF 6 , and we have now developed solid insulated switchgear (SIS) that uses molding of all main circuits. A new epoxy casting material is used which contains a large amount of spherical silica and a small amount of rubber particles. This new material has high mechanical strength, high thermal resistance, high toughness, and also high dielectric strength because of direct molding of the vacuum bottle, as well as reduced size and high reliability. This paper describes the technology of the new epoxy casting material which makes possible SIS. In addition, mechanical and electrical reliability tests of SIS using a new epoxy resin were performed, and the effectiveness of the developed material and the mechanical and electrical reliability of the SIS were verified. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 174(4): 28–36, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21057