Patent EA-002206-B1 (EA)
Title: Electrical connecting device and a protective device comprising such an electrical connection
Inventor: KERSUSAN JEAN-PIERRE
IPC: H01H85/20
Filed: 1999-09-30
Abstract: 1. An electrical connecting device (20) designed for transporting energy between the high voltage electrical power system and a protective fuse (10) protecting an electrical apparatus (4) constituting a load and located inside a tank (9) containing a liquid or gas dielectric (16) and comprising an orifice, the fuse (10) comprising two terminals, one (11) on the power supply side and the other (12) on the load side, the load-side terminal (12) being located inside the tank (9), the two terminals (11, 12) of the fuse (10) being connected by a fuse element (13) contained in a dielectric body (14), the device (20) comprising: - an electricity conducting core (25); - a power supply side connecting interface (21) designed for electrical connection of the core (25) with the electrical power supply; - a bushing (23) designed to be inserted in the orifice and comprising means for sealing the orifice and for fixing to the wall of the tank (9), designed to achieve the tightness between the inside and outside of the tank (9) at the level of the orifice and t6 electrically insulate the core from the wall of the tank (9); - a load-side connecting interface (24) designed for electrical connection of the core (25) with the power supply side terminal (11) of the fuse; characterized in that the load-side connecting interface (24) comprises a sheath (34) made of elastomer material able to be deformed elastically so as to envelop the power supply side terminal (11) of the fuse and to achieve the tightness and electrical insulation between the power supply side terminal (11) of the fuse and the internal medium of the tank (9). 2. The device according to claim 1, characterized in that the sheath (34) comprises at least one wall including an electrically conducting coating. 3. The device according to either one of the foregoing claims, characterized in that the sheath (34) comprises a lip (36) designed to operate in conjunction with the body (14) of the fuse (10) so as to achieve the tightness between the dielectric (16) of the tank (9) and the inside of the sheath (34). 4. The device according to any one of the foregoing claims, characterized in that the bushing (23) comprises a coating made of elastomer material moulded with the sheath (34). 5. The device according to any one of the foregoing claims, characterized in that it comprises a deformable electrical wire (22) with an insulating cladding (26) made of elastomer material enveloping one or more electrical conductors forming a part of the core (25) of the device. 6. The device according to claim 5, characterized in that the deformable electrical wire (22) is located outside the tank (9). 7. The device according to either one of the claims 5 or 6, characterized in that the insulating cladding (26) of the electrical wire (22) is made of the same elastomer material as that of the sheath (34). 8. The device according to any one of the claims 5 to 7. characterized in that the electrical wire (22) comprises a braid (27) of conducting strands. 9. A protective device of a medium voltage electrical (4), in particular a transformer (5), housed in a tank (9) containing a liquid or gas dielectric and comprising an ^ orifice, this device comprising: - a protective fuse (10) at least partially located inside the tank (9) and connected between the power supply and the apparatus (4), the fuse (10) comprising two terminals, one (11) on the power supply side and the other (12) on the load side, connected by a fuse element (13) contained in a dielectric body (14), the load-side terminal (12) being located inside the tank (9);and - an electrical connection device (20) according to any one of the claims 1 to 8, whose load-side connecting interface (24) is connected to the power supply side terminal (11) of the fuse. 10. An electrical apparatus (4) constituting a load supplied by a high voltage electrical power system, located inside a tank (9) containing a liquid or gas dielectric (16) and comprising an orifice, and provided with a protective device according to claim 9, arranged between the electrical power system and the electrical apparatus.