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Insulation characteristics of perfluorocarbon liquid/solid insulation for nonflammable large power transformer
Author(s) -
Miyagi Katsunori,
Horii Shigenobu,
Sugimoto Toshiro
Publication year - 1996
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.4391160608
Subject(s) - transformer , materials science , electromagnetic coil , composite material , insulation system , voltage , electrical engineering , nuclear engineering , engineering
Abstract A new type nonflammable large power transformer system is proposed in which the excellent cooling characteristics and insulation properties of nonflammable perfluorocarbon (PFC) liquid is utilized. In the system, transformer windings are put in an insulating cylinder filled with PFC liquid. The core includes cooling panel through the liquid. The space between the insulating cylinder and tank is filled with compressed SF 6 gas. This paper describes the insulation characteristics of main insulation and inter‐winding insulation models which simulate the transformer. It is found that (1) higher withstand voltage is expected by means of insulation barriers in the main insulation model; (2) partial discharge in inter‐winding insulation model is beginning to behave in a constant electric field strength on the point of 0.1 mm liquid gap length.