Electricity: conductors and insulators – With fluids or vacuum – With expansion and contraction means
Patent
1977-04-25
1979-01-02
Askin, Laramie E.
Electricity: conductors and insulators
With fluids or vacuum
With expansion and contraction means
174 15BH, H01B 1726
Patent
active
041328531
ABSTRACT:
An electrical insulating bushing with longitudinally extending channels for parallel coolant flow across the entire inner and outer surfaces of a hollow conductor. A first channel is formed by a plurality of ducts disposed between the conductor and a layer of insulative material which surrounds the electrical conductor; while a second channel is formed by a tubular member concentrically disposed within and radially spaced from the electrical conductor. An insulative bushing housing is spaced from the outer surface of the layer of insulative material to form a longitudinally extending third channel, the ends of which are in fluid flow communication with the ends of the first channel. Circumferentially spaced apertures in the upper and lower ends of the electrical conductor dispose the second channel in fluid flow communication with the third channel such that the coolant rises in the first and second channels to the top of the bushing by thermosiphon action and is returned through the third channel to the bottom of the insulating bushing. In another embodiment, an expansion cap provides an oil-tight seal between the housing of the insulating bushing and the conductor despite differences in thermal expansion of the members. Coolant flows from the second channel through circumferentially spaced apertures in the electrical conductor into the expansion cap wherein radially extending ducts in the lower spring seat of the compression spring assembly contained within the expansion cap define a fluid flow path between said cap and said third channel which directs the flow of coolant against the walls of the expansion cap for efficient heat transfer.
REFERENCES:
patent: 1878094 (1932-09-01), Atkinson
patent: 2853538 (1958-09-01), Frakes
patent: 3178504 (1965-04-01), Frakes et al.
patent: 3626079 (1971-12-01), Keen, Jr. et al.
Askin Laramie E.
Lackey D. R.
Westinghouse Electric Corp.
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