Electricity: conductors and insulators – With fluids or vacuum – With cooling or fluid feeding – circulating or distributing
Patent
1982-09-02
1984-04-10
Truhe, J. V.
Electricity: conductors and insulators
With fluids or vacuum
With cooling or fluid feeding, circulating or distributing
174 19, H01B 734
Patent
active
044423128
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electrical engineering and, in particular, to an end piece of a bipolar water-cooled cable.
DESCRIPTION OF THE PRIOR ART
Known in the art is an end piece of a bipolar flexible water-cooled cable, comprising two sturdy rings rigidly secured to each other through insulating and sealing spacers. One of the rings is connected to current-carrying strands of one polarity, while the other ring is connected to current-carrying strands of the opposite polarity (cf., for example, Reference Book of Welding, edited by S. V. Sokolov, vol. I, Moscow, 1961, p.368).
The end piece of such a design is bulky and heavy, the field of application being thus limited.
Also known in the art is an end piece of a bipolar water-cooled cable, comprising two members rigidly secured together through a sealing spacer. One member is provided with jacks to connect current-carrying conductors of one polarity and an opening to connect to a cooling water source, which is associated with spaces of the cable cooling system. In addition, this member of the cable end piece is provided with a groove. The other member of the cable end piece has an insert welded thereto, extending beyond the member and having the shape of a tee-joint. Current-carrying conductors of the opposite polarity are connected to this member. An insert of one member of the cable end piece fits into a recess in the other member, which a space-saving techique of separating conductors at cable ends and assemble the end pieces. Insulating spacers are provided between the insert and the recess, and between the members of the end piece. The members of the end piece are drawn together by a bolt fitted with an insulating washer. A sealing braid prevents water leakage between the insulation and members of the end piece (cf., for example, Collection of Articles by NIITavtoprom, Practical Experience of Volzhsky Plant, Welding series, Moscow, 1971, pp.11 and 76, pos.19, in Russian).
The known end piece is compact but does nothing to prevent sharp bending of conductors where they are connected to the cable end piece, which may be due to electrodynamic jerks or mechanical twist of the cable in the process of work. Such bends can be the cause of premature fracture of strands or rupture of insulation between conductors of opposite polarities leading to short circuits.
SUMMARY OF THE INVENTION
It is an object of this invention to provide an end piece of a bipolr water-cooled cable, having rigid isolation of the conductors at the splicing points, which prevents bends and rupture of conductors, thus prolonging the cable service life.
The invention provides an end piece of a bipolar water-cooled cable, comprising two parts rigidly secured together with a sealing insulation spacer fit between them. One part is provided with sockets to connect current-carrying conductors of one polarity, an opening to be connected to a cooling water source, associated with spaces of the cable cooling system, and a recess. The other part is provided with an insert extending beyond the butt end thereof and fitted, through an insulation spacer, in the recess in order to connect current-carrying conductors of the opposite polarity. According to the invention, the portion of the insert extending beyond the butt end is cylindrical in shape, protrudes to a length not less than 2.5 diameters thereof and features a blind central hole which is the socket for connection of current-carrying conductors of the opposite polarity. A sleeve of an insulation material is rigidly secured on said insert and extends beyond the insert butt end.
Advisably, the sleeve should be provided with an internal annular groove forming a passage for the cooling liquid around the cylindrical portion of the insert.
Desirably, the cylindrical portion of the insert should be provided with length-wise and radial ducts associating with spaces of the cable cooling system.
An end piece of a bipolar water-cooled cable, according to the present invention, ensures rigid isolation of current-carryi
REFERENCES:
patent: 2113516 (1938-04-01), Possenti
patent: 3127467 (1964-03-01), Toto
patent: 3244792 (1966-04-01), Smith
patent: 3784722 (1974-01-01), Goodman
patent: 3872232 (1975-03-01), Goodman
patent: 3952141 (1976-04-01), Hubner
Banov Mikhail D.
Chernyshev Alexandr N.
Oshkin Anatoly I.
Nimmo Morris H.
Truhe J. V.
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