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Breakdown strength of perfluorocarbon liquid/vapor and mixtures of the liquid with SF 6
Author(s) -
Miyagi Katsunori,
Kagami Kenji,
Horii Shigenobu,
Sugimoto Toshiro
Publication year - 2000
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 - 10.1002/1520-6416(20010115)134:1<1::aid-eej1>3.0.co;2-x
Subject(s) - materials science , vapor phase , breakdown voltage , impulse (physics) , electrode , vapor pressure , dielectric withstand test , dielectric strength , phase (matter) , composite material , voltage , analytical chemistry (journal) , electrical engineering , thermodynamics , dielectric , chemistry , optoelectronics , chromatography , physics , organic chemistry , quantum mechanics , engineering
In the insulation design for power apparatus which use perfluorocarbon (PFC) liquid, it is necessary to study the breakdown strength of the liquid/vapor under a uniform field. Particularly for devices with SF 6 , the breakdown strength is an important factor in insulation engineering. This paper presents an investigation on the insulation characteristics of PFC liquid/vapor with and without SF 6 , when the temperature is varied from 20 °C to 80 °C. Experiments are performed using plane–plane electrode geometry in a closed system under ac and lightning impulse voltages. Results are as follows: (1) in the case of PFC vapor pressure above the liquid without SF 6 , the breakdown strength in the liquid phase is little affected by the temperature rise, whereas it increases greatly in the vapor phase under the same condition; (2) in the other case of a mixture pressure above the liquid with SF 6 under ac voltage, the breakdown strength of the mixture vapor phase is given by adding the contribution of the two components (PFC vapor and SF 6 ). © 2000 Scripta Technica, Electr Eng Jpn 134(1): 1–9, 2001