Electricity: conductors and insulators – With fluids or vacuum – With cooling or fluid feeding – circulating or distributing
Patent
1982-08-10
1984-10-16
Gonzales, John
Electricity: conductors and insulators
With fluids or vacuum
With cooling or fluid feeding, circulating or distributing
174 88C, H02K 324, H02K 340, H01R 905
Patent
active
044776900
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
This invention relates to electromechanical engineering and, in particular, to a coupling unit for two multilayer cables of a stator winding of a high-voltage generator.
PRIOR ART
Modern electrical power engineering tends to use higher operating voltages of electrical machines and equipment, such as power transmission lines, transformers and generators in order to raise the efficiency thereof. However, higher working voltage complicates mating of electrical machines and equipment, for example, joining a high-voltage cable to a power transmission line or a transformer to a high-voltage cable. In particular, it becomes quite a problem to couple the face ends of high-voltage cables of a stator winding.
The prototype of the present invention is a coupling unit of two multilayer cables of a high-voltage generator stator winding (cf., The Proceedings of the Institute of Electrical Engineers, Vol. 67, No. 393, 1929, London, pp. 1065-1870, C. A. Parsons and J. Rosen, Direct Generation of Alternating Current of High Voltages).
The known coupling unit of two multilayer cables of a high-voltage generator stator winding, located in the end-face portion thereof, comprises terminations of the two cables, having concentric conducting layers made as tubes separated from one another by insulating layers. The coupling unit also has jumpers electrically joining conducting layers of the two multilayer cables, a portion of each insulating layer facing the jumpers having the shape of an end insulating frustum.
The jumpers are copper busbars placed on insulated supports in the end-face parts of the generator.
Terminations of cables in the known coupling unit are comparatively long, which is accounted for by the fact that wherever the insulation is interrupted, and this is exactly the zone of cable termination, the electric field is distributed in a highly irregular manner, which can lead to rupture of insulating layers. In order to remedy this fault and to do away with the danger all insulating layers in the terminating zone end in insulation frustums whose length depends on how low the electric field intensity is to be brought to match a specific level. Each insulation frustum thus becomes very long and would be still longer with the growth of the nominal voltage.
In this way the known coupling unit of two multilayer cables of a high-voltage generator stator winding becomes irritatingly bulky and generators rated for high stator voltages (110 kv, 220 kv and higher) are much more complex in manufacture.
The known coupling unit of two multilayer cables of a high-voltage generator stator winding is also deficient in that it does not permit direct cooling of the stator winding by feeding the cooling agent into the winding itself.
DISCLOSURE OF THE INVENTION
It is an object of the invention to provide a coupling unit of two multilayer cables of a high-voltage generator stator winding, wherein terminations of multilayer cables are connected so that to reduce the dimensions of the coupling unit and ensure direct cooling of said winding.
The invention resides in that in a coupling unit of two multilayer cables of a high-voltage generator stator winding, located in the end-face portion thereof, comprising terminations of the two cables, which have concentrically arranged conducting layers made as tubes separated by insulating layers, jumpers electrically connecting these conducting layers of the multilayer cables, the portion of each insulating layer facing the jumpers having the shape of an end insulation frustum, according to the invention, each jumper is a totality of components each made as a part of a hollow cylinder, limited by two planes, the components of the jumper connecting respective conducting layers of the terminations are arranged with respect to one another so that the jumper is a cylindrical surface having slots between said components, running parallel to the axis thereof, the components of the jumper connecting each subsequent layers are displaced with respect to jumper components connecting
REFERENCES:
patent: 2006170 (1935-06-01), Juhlin
Publication "Direct Generation of Alternating Current at High Voltages", Hon. Sir Charles A. Parsons, Journal I.E.E., vol. 67, No. 393, Sep. 1929.
Bezchastnov Gennady A.
Danilevich Yanush B.
Kabanov Pavel S.
Maslennikov Konstantin N.
Nemeni Tibor M.
Gonzales John
Nimmo Morris H.
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