Uninflammable insulating liquid

Compositions – Fluent dielectric – O-containing

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Details

252573, 252574, 252578, 252579, H01B 324, H01B 320

Patent

active

058716734

ABSTRACT:
An uninflammable insulating liquid is obtained by adding an emulsifying agent having a volume ratio of 1 to 3% to an insulating liquid containing a fluorocarbon liquid of at least 25% in a volume ratio to cause emulsification. In this liquid mixture, when polyol ester or polydimethylsiloxane is used as the insulating liquid, an uninflammable insulating liquid that does not cause pollution or an environmental problem can be obtained. When tricresyl phosphate is used as the insulating liquid, an uninflammable insulating liquid having a dielectric constant close to that of insulating paper can be obtained. A liquid pipe for circulating a fluorocarbon emulsion in a tank is provided outside the tank, and a pump and a stirrer are connected midway along the liquid pipe to constantly stir the fluorocarbon emulsion, thereby preventing it from being separated into two layers. When a radiator is provided to the liquid pipe, the stirring system for the fluorocarbon emulsion can also serve as the cooling system.

REFERENCES:
patent: 3701732 (1972-10-01), Smith
patent: 4556511 (1985-12-01), Nishigaki et al.
patent: 4806276 (1989-02-01), Maier
patent: 4812262 (1989-03-01), Shinzawa et al.
patent: 5032307 (1991-07-01), Carlson
patent: 5391314 (1995-02-01), Minemura et al.
Giri et al, "Dielectric permittivity measurements on highly conductive per fluoropolyether microemulsions", Chem Abs 119, 29146, 1993.

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