Cable termination

Details Cable termination Cable termination

1996-12-16

1999-06-01

Paumen, Gary

Electrical connectors

With vitreous-type envelope

Having bayonet-coupling contact

439921, H01R 903

Patent

active

059083328

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Technical Field
The present invention relates to a device for interconnecting a high voltage cable with an apparatus and/or with a second high voltage cable consisting of a cable termination and a rigid insulator.
2. Description of the Prior Art
When connecting such high voltage power cables in normal joints, in transition joints, to transformers and other SF6 and oil filled apparatus and accessories and out-door terminals, the interfaces are usually different for each application.


SUMMARY OF THE INVENTION

Therefore, the object of the present invention is to provide a simplified connection system for the above cables having ratings up to 400 KV and above. The features of the invention are defined in the accompanying patent claims.
With the present invention there is obtained a common cable connection system for all accessories and interconnections. The interface between the cable end and any accessory, between two cable ends or between two apparatus is generally applicable, resulting in a number of advantages, such as factory pretesting, reduction of installation time and cost, reduction of tools and simplified field testing.
The stress cone design and dimensions would also be the same for all applications, the only variation being the diameter of the cable or apparatus entrance.
A further advantage is that the interface components does not include any gas or oil and, therefore, they cannot leak or explode.
Above mentioned and other features and objects of the present invention will clearly appear from the following detailed description of embodiments of the invention taken in conjunction with the drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to 3 illustrate three different principles of interface between a cable end and accessories,
FIGS. 4 to 12 illustrate several applications of the invention, and
FIG. 13 illustrates a rigid insulator corresponding to the insulator shown in FIG. 4.


DETAILED DESCRIPTION OF THE INVENTION

In FIGS. 1, 2 and 3, there are illustrated three interface methods,--respectively called an inner cone concept, an outer cone concept and a no cone or slight inner cone concept. The type of cone concept refers to the shape of the connector on the apparatus side. In all three figures an apparatus or accessory 1, 2 and 3 respectively, are indicated to the left. Connectors 4, 5 and 6 are respectively provided with an inner cone 7, an outer cone 8 and a slight inner cone 9. The interface could also be obtained by using plane contacting surfaces.
To the right in FIGS. 1 to 3 are illustrated three cables 10, 11 and 12, respectively provided with terminations 13, 14 and 15 having end surfaces 16, 17 and 18 fitting the corresponding coned surfaces 7, 8 and 9. The conductor joints (plug-in, welding, clamping etc) are not part of the present invention and will not be described here. We have only indicated cable connectors 19, 20 and 21 on the cable terminations 13, 14 and 15 respectively.
In the following detailed description of examples of cable connections we have chosen to show the outer cone concept, it being understood however, that the same series of interconnections can be obtained with the inner cone concept and with the slight inner cone (or plane) concept.
A general advantage of the outer cone concept over the inner cone is that the outer cone separates the cable connection further from the apparatus it is connected to, than does the inner cone. Hence a fault at one side is less likely to affect the other side.
The inner cone concept would have the advantage that a shorter solution could be used outside an SF6 cubicle. Problems with the coned surfaces may arise when components are made by different suppliers. The apparatus connectors are usually made of epoxy or similar non-compressible, rigid material, whereas the cable terminations usually are made of rubber and similar compressible or elastomeric materials. The outer cone concept would have the advantage over the inner cone concept that it is easier to expand the rubber material than to co

REFERENCES:
patent: 3401370 (1968-09-01), Weinfurt et al.
patent: 4946393 (1990-08-01), Borgstrom et al.

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