H - Electricity – 02 – G
Patent
H - Electricity
02
G
H02G 15/08 (2006.01) H01R 4/28 (2006.01) H01R 4/46 (2006.01) H01R 4/56 (2006.01) H02G 9/02 (2006.01)
Patent
CA 2071227
A device for joining sections of solid-dielectric underground cable comprises conductor extension pieces or ferrules respectively attached to the center conductors of each of the cable sections, conductor inserts installed in a cavity of each of the ferrules, and a conductor clamp for clamping the ferrules together in a predetermined longitudinal arrangement. The conductor clamp comprises a pair of semi-cylindrical shell pieces which, when assembled together, form a modified cylindrical structure having a central aperture for receiving the ferrules. Each conductor insert includes a disk-shaped flange plate on its outer end. The central aperture includes a cavity having an enlarged inner diameter for receiving and constraining the disk-shaped flange plates of the conductor inserts. The shell pieces of the clamp are assembled in an opposed relationship to form a modified cylinder surrounding the ferrules and the conductor inserts. Fasteners are used to compress the shall pieces toward one another into secure engagement with the ferrules. The fasteners are removable, thereby allowing the clamp to be disassembled so that the joint may be easily disconnected when required. The shell pieces are tightly compressed against the ferrules so that the ferrules, and the center conductors to which they are attached, are retained in a desired predetermined mechanical relationship. Because the flange plates of the conductor inserts are larger than the central aperture of the assembled clamp, the flange plates are longitudinally constrained by the walls of the cavity. As a result, the assembly can withstand large forces in tension and compression which may be produced due to thermal expansion and contraction of the cable. In addition, the compression of the shell pieces against the ferrules causes the interior walls of the central aperture to bear tightly against the ferrules along a significant distance, thereby producing an electrical connection capable of carrying high currents between these parts. Accordingly, an electrically conductive path is formed from the first cable center conductor through the first ferrule, the conductor clamp, and the second ferrule, to the second cable center conductor.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
G. & W. Electric Company
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