Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-08-26
1983-12-13
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 71, H02K 324
Patent
active
044207018
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to electrical equipment and, in particular, to a coupling unit designed to connect a generator high-voltage winding with an inlet bar.
PRIOR ART
Modern power engineering tends to use higher voltage in power transmission lines, transformers and generators in order to improve their efficiency and reduce dimensions.
However, the use of high and superhigh voltage brings in a problem of developing new coupling units for mating various high-voltage electrical elements, for example, junctions for coupling a high-voltage cable and an aerial power transmission line or a calbe lead-in of a transformer.
One of the problems in coupling a high-voltage generator and external equipment consists in providing a junction assembly for connection of the generator high-voltage winding and an inlet bar which is to be joined to some external electrical piece of equipment, for example, a high-voltage cable.
The closest prototype of the invention is a coupling unit for connection of a generator high-voltage winding and an inlet bar (Electrotechnika magazine, No. 6, 1977, G. A. Beschastnov, A. V. Ivanov-Smolensky, P. Z. Nikitin, T. M. Nemeny. High-Voltage Generators, Energia Publ., Moscow, pp. 1-2, in Russian), comprising cooling ducts and insulated conductors of the generator high-voltage winding, linked to an inlet bar, arranged in the front part of the generator stator.
The inlet bar here is a copper bus extending inside a copper pipe and electrically connected thereto. The copper pipe is inside an insulating cone formed by cutting into the frame insulation of the high-voltage winding. The copper pipe is designed to form an electric field in the zone of the high-voltage lead-in and to feed a coolant, for example, oil into the high-voltage winding.
The high-voltage winding consists of coils, cooling ducts being produced between the layers of coil turns by means of special layings, wherein the oil is fed from the copper pipe.
The known coupling unit is characterized by irregular distribution of voltage throughout the surface of the insulation cone of the coupling unit for connection of a generator high-voltage winding and an inlet bar, which can be accounted for by a sharp separation of the insulation in the high-voltage lead-in zone resulting in a highly irregular insulation medium.
This irregular distribution of voltage along the surface of the coupling unit insulation cone may lead to rupture of insulation in places where the field intensity is at its maximum. To avoid possible ruptures of insulation in the known coupling unit the insulation cone is made very large.
DISCLOSURE OF THE INVENTION
It is an object of the invention to provide a coupling unit for connection of a generator high-voltage winding and an inlet bar, whose high-voltage lead-in and such coupling of tubes of summary turns of the generator high-voltage winding in the zone of the high-voltage lead-in as to reduce dimensions and improve serviceability of said coupling unit.
The invention essentially resides in that in a coupling unit for connection of a generator high-voltage winding and an inlet bar, comprising insulated conductors of the generator high-voltage winding, located in the front part of the generator stator and joined to the inlet bar in the zone of a high-voltage lead-in, and cooling ducts, according to the invention, conducting layers made up of insulated conductors form summary turns of the generator high-voltage winding in the shape of concentrically arranged tubes connected to one another in the high-voltage lead-in zone by means of template tubular elements securing consecutive transition of the tube of a first summary turn of the high-voltage winding into the tube of a second summary turn, of the tube of the second summary turn into a tube of a third summary turn and so on until the tube of the penultimate summary turn changes over into the tube of the last summary turn of the high-voltage generator winding, which is the zero potential lead-out, the cooling ducts being separated into a ce
REFERENCES:
patent: 2006170 (1935-06-01), Juhlin
patent: 2929943 (1960-03-01), Richardson et al.
patent: 3457440 (1969-07-01), Horsley
patent: 3510700 (1970-05-01), Grinchenko et al.
patent: 3955110 (1976-05-01), Karlen
"Turbogenerators Design and Structure" by Titor et al., pp. 180-182.
Bezchastnov Gennady A.
Danilevich Yanush B.
Kabanov Pavel S.
Karymov Anatoly A.
Maslennikov Konstantin N.
Duggan Donovan F.
Nauchno-Issledovatelsky Sektor Vsesojuznogo Proektno-Izyskatelsk
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