Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
1998-10-06
2001-01-09
Kincaid, Kristine (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C174S07400A, C174S08400S
Reexamination Certificate
active
06172304
ABSTRACT:
The present invention relates to a device for providing leakproof protection to a splice in a high voltage cable, the device comprising at least one tubular metal structure and at least one outer insulating sheath.
BACKGROUND OF THE INVENTION
Protection devices of this type are already known which comprise coverings made up of numerous parts that the operative must assemble on the site where the cable is being installed. The parts comprise copper or lead tubes that the operative must weld or screw together, rings of brass, bronze, or insulating material, gaskets that may be toroidal or flat, boxes made of fiberglass reinforced epoxy resin, connection equipment, fasteners, heat-shrink sheaths, mastic, and a large quantity of filler for casting on site.
Such coverings are expensive, difficult to assemble, and the extent to which they are leakproof depends mainly on the skill of the operative.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention seeks to remedy those drawbacks by providing a protection device for a high voltage cable splice that is constituted by a minimum number of elements, which elements are entirely prefabricated in the factory.
Prefabrication means that it is possible in the factory to perform a high degree of quality control concerning electrical, visual, and dimensional characteristics, thereby greatly simplifying the assembly operations that need to be performed on site.
To this end, the leakproof detection device of the invention comprising a tubular metal structure and an outer insulating sheath is constituted by first and second prefabricated elements having a zone of mutual leakproof connection and each comprising at least one first tube and an outer preformed covering secured to each tube of the prefabricated element, the tubes of said assembled-together prefabricated elements, together constituting said tubular metal structure and their respective preformed coverings, are coupled together in leakproof manner in said connection zone, thereby constituting said outer insulating sheath.
In a preferred embodiment, said first tube of one of said prefabricated elements has a flare at one of its ends, thereby enabling it to be engaged on one of the ends of said first tube of the other of said prefabricated elements, and enabling said mutually engaged ends to be welded together. Advantageously, the tubes are made of copper and are made using copper sheet that is rolled and welded. Preferably, the preformed coverings are adapted to the profiles of the respective tubes and are made of synthetic material by rotational molding.
Advantageously, the two preformed coverings are coupled together by means of an extra part which covers the connection zone between said first tubes and which is linked in leakproof manner to each of the two coverings.
In a first embodiment, there is only one first tube in each of said prefabricated elements, each of said tubes comprising two opposite cylindrical segments interconnected by a conical segment, said connection zone between said prefabricated elements being at the terminal end of the larger-diameter cylindrical segment of each of the first tubes.
In this embodiment, one of the cylindrical segments has a diameter that matches that of a cable to be connected, and the other cylindrical segment matches the diameter of a splice body.
In an advantageous second embodiment, there is only one first tube in said first prefabricated element, which tube has two circularly cylindrical segments of different diameters with a conical segment between them, while the second prefabricated element comprises said first tube thereof and a second tube, both tubes being cylindrical but of different diameters and being mounted substantially one after the other, the tubes being insulated from each other and both of them carrying said preformed covering of said second prefabricated element.
Advantageously, said first and second tubes of said second prefabricated element have two facing ends, each having a conical extension at the same angle and leaving a space between them.
In which case, the space between said first and second tubes of the second element is filled with an insulating material.
Also, the two tubes are respectively associated with means for connection to external local grounding cables for each of them or for permutating shields.
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Hahn Heinz
Laurent Michel
Alcatel
Kincaid Kristine
Mayo III William H.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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