insulating verbindungsvorrichtung for electrical cables in a high-voltage distribution system

摘要

1322767 Electric couplings MINNESOTA MINING & MFG CO 24 Sept 1970 [25 Sept 1969] 45642/70 Heading H2E A protective insulating covering for a modular high voltage electrical distribution junction assembly comprises at least one generally cylindrical body 12 open at one end to accept a cable terminal lug 17, having plug 30 and socket 33 members formed transverse to the hollow body; one terminal body 11 having a socket 29; and a terminal cap 13 in the form of a plug part. Each part has a conductive shield 19, 24, 27, an insulating portion 20, 25, 28 and a semiconducting layer 18, 23, 26. The conical socket surfaces are formed having an apex angle of 30-90 degrees and the plug surfaces have apex angle of a socket plus an amount between 6 degrees to SP1/SP/ 3 the socket surface angle, the preferred socket angle being 60 degrees. In assembly, the terminal 15, crimped to the wire 14 is inserted into the body and the rod 21 is screwed into the threaded hole in the terminal. The assembly 12 is then inserted over the rod and held captive to unit 11 by nut 22, so that a seal is formed between the plug and socket, the shield layers 19, 24 connecting. Further assemblies are added by screwing a further rod into the nut 22 &c. The assembly is terminated by the plug 13, the semi-conducting layer 26 being optional. The insulation material may be of elastomeric ethylene-propylene terpolymer. Air pockets at the plug and socket junctions may be removed by providing across the junction a removable wire as a temporary escape path and insulating dielectric grease may be provided over the plug and socket surfaces. The terminal unit 11 may be provided with a plug member rather than a socket, and the position of the succeeding modules is then reversed.