Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1996-04-29
1998-09-15
Arbes, Carl J.
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29866, 29868, 29872, 403314, 403367, 403368, H01R 4300, F16B 202
Patent
active
058061800
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method and a device for automatic installing a supplement to a socket joint in a high voltage electrical line with the supplement comprising an additional joint in the form of a shunt.
BACKGROUND OF THE INVENTION
High voltage power lines are provided with joints at various locations for manufacturing and transportation reasons. When manufactured, electrical lines may be wound onto reels of predetermined lengths. Such reels may be readily transported to a location for installation. As such, it may be necessary to install a joint at a point where successive reels are to be spliced together. In addition, such joints may be required where aline is repaired after a break or the like.
Electrical cables with a core of steel, surrounded by aluminum threads have a normal length of 1000-3000 meters. As an example, the Swedish high voltage power distribution system extends approximately 15,000 kilometers, with each power line comprising approximately six to nine cables. Thus, a typical power distribution system may contain an appreciable number of joints.
FIG. 1 illustrates a typical prior art joint for a high voltage power line. Joints in high voltage power lines in most instances comprise an aluminum socket 2, in which the ends of a cable 1 to be joined have been introduced. The socket is then pressed together under a high hydraulic pressure at points 3 and 4 to crimp the cables into place and form an electrical and mechanical connection.
As an example, the major part of the Swedish power supply system was built between 1940 and 1960. The great number of such joints have thus been exposed, during the last 30 to 40 years, to alternating rain, cold and heat and to a corrosive environment. Such exposure has in many cases led to corrosion damage to such socket joints. Corrosion damage in socket joints may weaken the joint, and the joint may not safely withstand the mechanical load they are designed for. Moreover, such corrosion may introduce electrical resistance into the joint, causing increased heating at the joint and reduced load carrying capacity for the entire power line.
Disasters have occurred when cables transferring current for 400 kV lines have fallen down because of joint failure. Such accidents cause great risks and expensive service interruption for repair of the joint concerned, which has hitherto been performed with more or less manual methods at ground level.
Thus, it is desirable to reinforce such joints prior to failure rather than wait until a failure occurs and disaster strikes. However, due to electrical demand, it may be difficult to justify disruption of electrical service to replace or reinforce a joint which may or may not be on the verge of failure. Thus, it remains a requirement in the are to be able to reinforce a high voltage electrical joint in situ, without disruption of electrical power during the joint repair.
SUMMARY AND OBJECTS OF THE INVENTION
It is an object of the present invention to provide a method and apparatus for installing a supplemental joint in a high voltage line which may be used while the line is in service.
It is a further object of the present invention to provide an apparatus for installing a supplemental joint in a high voltage line which is relatively simple to use.
It is a further object of the present invention to provide an apparatus for installing a supplemental joint in a high voltage line which has a simple design.
It is a further object of the present invention to provide a method and apparatus for installing a supplemental joint in a high voltage line, such that the cost for installing the supplemental joint is low compared with methods for replacing joints used hitherto.
The apparatus of the present invention comprises two parts; an apparatus for automatically installing the supplemental (shunt) joint, and the shunt joint itself. The shunt joint provides both mechanical and electrical connection between two ends of an electrical cable, augmenting the existing joint which may remain in place.
REFERENCES:
patent: 3436820 (1969-04-01), Reem et al.
patent: 3828601 (1974-08-01), Tessmann
patent: 3890689 (1975-06-01), Copas
patent: 3934784 (1976-01-01), Tessman
patent: 3956822 (1976-05-01), Folk
patent: 4223436 (1980-09-01), Silva
patent: 4512828 (1985-04-01), Helm
patent: 4531283 (1985-07-01), Kitchens et al.
Arbes Carl J.
Vattenfall AB
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