The Electricity Council

Imperial Chemical Industries Limited

Harold Lloyd

David S Slinn

John Coxon

Dielectric, cooling or arc-extinguishing fluids comprise a mixture of tetrachlorodifluoroethane and perchloroethylene, optionally with incorporation of a third component which is preferably trichlorotrifluoroethane. Transformer and circuit-interrupter apparatus containing such dielectric fluids are also described.

Dielectric fluids and apparatus incorporating such fluids

An electrical circuit interrupting device such as a circuit breaker or switch has openable contacts immersed in a first relatively dense liquid, such as a perfluorocarbon, constituting an arc interruption medium and has a second less dense non-flammable dielectric liquid e.g. a halogenated liquid such as perchloroethylene or trichlorobenzene or carbontetrachloride constituting a coolant forming a second phase above the first liquid.

Electrical circuit interrupting devices

A liquid halogenated hydrogenated hydrocarbon composition suitable for use as a dielectric and/or arc-extinguishing fluid in electrical apparatus, which comprises

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Harold Lloyd