Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1980-12-18
1984-06-05
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 72, H02K 1100
Patent
active
044530986
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to electrical equipment and, in particular, to cable couplings and specifically to a coupling unit for connection of a lead-out of a high-voltage generator winding and a cable.
PRIOR ART
Modern electrical engineering tends to use higher voltage in power transmission lines, transformers and generators in an attempt to increase their efficiency and minimize dimensions.
However, the use of high and superhigh voltages brings in the problem of designing coupling units for connection of various electrical elements, for example, units to couple high-voltage cables to aerial lines or cable lead-ins for transformers.
One way of coupling a high-voltage generator to other electrical devices consists in connecting an oil-filled cable of a high-voltage generator stator winding to an oil-filled cable joining the high-voltage generator to a high-voltage station or line.
The closest prototype of the present invention is a coupling unit for connection of a lead-out of a high-voltage generator winding and a cable linking said lead to external electrical apparatuses, which is made as a cable joint box (V. A. Privezetsev, E. P. Larina, Power Cables and High-Voltage Cable Lines. 1970, Energia Publ., Moscow, pp. 72-73, 77-79. (in Russian).
The known coupling unit comprises a casing filled with an insulating substance, oil, for example, wherein the cable termination featuring a capacitor splice and the lead-out of the generator high-voltage winding, featuring sheaths and a capacitor splice, are arranged, the current-carrying elements thereof being coupled to one another, both the lead-out of the generator high-voltage winding and the cable termination being encased into an insulating hermetically sealed coating.
The known coupling unit is characterized by irregular distribution of voltage throughout the surface of the splice of the cable termination which is dependent upon the capacitance between the plates of said capacitor splice and upon the capacitance between the plates of the cable termination splice and the casing.
Irregular distribution of voltage throughout the surface of the capacitor splicing of the cable termination may result in rupture of insulation whereever the intensity of the electrical field is the greatest. The capacitor splicing of the cable termination is made very long in order to eliminate the possibility of such ruptures in the known coupling unit for connection of the high-voltage generator winding and the cable, which makes the unit bulky.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a coupling unit for connection of a generator high-voltage winding lead-out and a cable joining the generator to external electrical apparatuses, wherein the cable termination permits reduction of the coupling unit size and higher reliability thereof.
The invention essentially resides in that in a coupling unit for connection of a generator high-voltage winding lead-out and a cable, comprising a casing filled with an insulation substance and accommodating a cable termination with a capacitor splice and a lead-out of a generator high-voltage winding, featuring sheaths and a capacitor splice, whose current carrying elements are connected to one another, the lead-out of the generator high-voltage winding being encased into an insulating hermetically sealed coating, according to the invention, the sheaths of the generator high-voltage winding lead-out are made as a system of concentric cylinders, which form at the edge of the lead-out a capacitor splice, contact rings being arranged on the surface of the capacitor splice of the generator high-voltage winding lead-out at a certain distance from one another, each such ring being connected to its sheath of the generator high-voltage winding lead-out, which has a specific electric potential, whereas the plates of the capacitor splice of the cable termination are connected to its contact rings arranged on the surface of the capacitor splice of the cable termination, each contact ring loca
REFERENCES:
patent: 4390219 (1983-06-01), Beehler
patent: 4420701 (1983-12-01), Nikitin et al.
Bezchastnov Gennady A.
Danilevich Yanush B.
Kabanov Pavel S.
Maslennikov Konstantin N.
Nemeni Tibor M.
Duggan Donovan F.
Vsesojuzny Proektno-Izyskatelsky I. Nauchno-Issledovatelsky Inst
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