Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1981-07-16
1984-01-31
Gonzales, John
Electrical generator or motor structure
Dynamoelectric
Rotary
H02K 112
Patent
active
044292449
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the manufacture of electrical machinery and, more particularly, to a stator of a generator.
PRIOR ART
The current trend in the manufacture of generators is towards increasing the unit capacity, wherefore the stator winding of a turbogenerator has to be designed for heavy rated currents (from 10 kA to 60 kA).
Considering that generator voltage is normally in the range of 15 kV to 27 kV, this means a considerable increase of the size of the stator winding bars and stator slots. It must also be pointed out that energy is transmitted from a high-power generator to a high-voltage network through a step-up transformer which is integral with the turbogenerator. The provision of a step-up transformer involves considerable expenditures moreover, while in operation, such a transformer accounts for certain power losses (cf. V. V. Titov, G. M. Khutoretsky, G. A. Zagorodnaya, G. P. Vartanian, D. I. Zaslavsky, I. A. Smotrov. Turbogenerators: Calculation and Design. Energia Publishers, Leningrad, 1967, pp. 38-45, 111-126). One of the ways to raise voltage across the stator winding is to manufacture the stator winding from high-voltage cable.
Of all the known generator stators, the closest to the one of the present invention is the stator of a water-and-oil-cooled generator developed in the USSR (cf. L. P. Gnedin, Ya. V. Danilevich, K. N. Maslennikov, K. F. Potekhin, V. F. Chirikov, N. I. Shkolnikov, A. K. Shadrintsev. "Water-and-Oil-Cooled Turbogenerator TVM-300". J. Electrotechnika, No. 1, 1970, pp. 6-8).
This stator comprises a housing which accommodates a slotted magnetic core of laminated steel, a dielectric oil-separating cylinder arranged next to the internal surface of the magnetic core, and a winding composed of high-voltage elements with oil-and-paper insulation, which elements are arranged in the slots and secured by wedges. The insulation of all the high-voltage elements of the winding is designed for maximum phase voltage. Voltage across those high-voltage elements which are close to the zero potential point is lower than maximum phase voltage, wherefore these elements may have a thinner insulation layer.
The stator under review is disadvantageous in that it requires much insulation. The insulation must be very thick, especially when voltage across the stator winding is upwards of 110 kV. This means that the bars have to be internally cooled; however, the feeding of a coolant necessitates a great number of intermediate electric connections in the end winding zones.
The thick insulation means an increased curvature radius of the bars, which, in turn, accounts for an increased size of the end winding coils.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a stator of a design that would make it possible to reduce the amount of insulation and the number of electric connections in the end winding.
The invention, thus, resides in providing a stator of a generator, which stator comprises a housing accommodating a slotted magnetic core of laminated steel, a dielectric oil-separating cylinder arranged next to the internal surface of the magnetic core, and a winding composed of high-voltage elements divided by spacers, arranged in the slots and secured by wedges, the stator being characterized, according to the invention, in that the winding is composed of two half-windings placed in series and separated by an oil-separating spacer, the high-voltage elements of one of the half-windings, arranged in the stator slots, being accommodated in insulation sleeves having hollow projections on their internal surfaces with a thermosetting compound placed between said hollow projections, the part of each insulation sleeve, which extends beyond the stator slot, having a cylindrical portion and a cone-shaped cable-type termination of a predetermined size, reinforced with current-carrying layers, said cylindrical portion being integral with said cable-type termination.
It is preferable that the current-carrying layers should be made of foi
REFERENCES:
patent: 2749456 (1956-06-01), Luenberger
patent: 3743867 (1973-07-01), Smith
patent: 4164672 (1979-08-01), Flick
Bezchastnov Gennady A.
Nemeni Tibor M.
Nikitin Pavel Z.
Nikolsky Alexandr I.
Sharashkin Andrei M.
Gonzales John
Greenspan Myron
Lilling Bruce E.
Lilling Burton L.
Vsesojuzny Proektnoizyskatelsky I Nauchno-Issledovatelsky Instit
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