Development of 77 kV 40 MVA Gas-Vapor Cooled Transformer

Tokoro,; Harumoto,; Kabayama,; Yamauchi,; Satô,; Ina,

doi:10.1109/mper.1982.5519835

Cited by 1 publication

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“…It has been presumed as a contributing component to the breakdown strength due to the temperature change in this kind of mixture vapor phase that the SF 6 gas does not change with temperature and only the breakdown strength of the PFC vapor changes [11]. Here, in the case where the PFC vapor and the SF 6 gas are mixed together in the constant-temperature tightly closed system, since a linear relation can be obtained roughly for the breakdown strength with their mixture ratio varied [13], it is expected that the breakdown strength in the mixture vapor phase can be determined by using technique (i). However, when the PFC liquid quantity becomes larger, since the SF 6 gas will be dissolved in the PFC liquid or released from the PFC liquid due to the temperature change, U g in the vapor phase part will change with temperature.…”

Section: Insulation Breakdown Characteristics In Mixture Vapor Phase mentioning

confidence: 99%

Breakdown strength of perfluorocarbon liquid/vapor and mixtures of the liquid with SF6

et al. 2000

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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 SF6, 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 SF6, 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 SF6, 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 SF6 under ac voltage, the breakdown strength of the mixture vapor phase is given by adding the contribution of the two components (PFC vapor and SF6). © 2000 Scripta Technica, Electr Eng Jpn 134(1): 1–9, 2001

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Section: Insulation Breakdown Characteristics In Mixture Vapor Phase mentioning

confidence: 99%