Metal-enclosed high voltage line

Claim 1

A metal-enclosed high voltage line comprising an electrical conductor, a metal enclosure having an inner surface and surrounding the conductor, a disc-shaped insulating body coaxially mounted on the conductor and supporting said conductor coaxially in said enclosure, said insulating body filling in the inner cross-section of the enclosure in a gas-tight and arcimpermeable manner and having a diameter greater than the diameter of the inner surface and therefore, an outer portion, including the rim of the disc, radially extending beyond the inner surface and said insulating body having a length in axial directions, means defining an annular recess receiving the outer portion of the insulating body, at each side of the insulating body a respective sealed flame-resistant ring for preventing destruction of ancapsulation during a continuous disturbance of an arc, including electrically shielding the outer portion of the insulator body, each of said flame-resistant rings being placed at the inner surface of the enclosure adjacent the insulating body and having an annular face abutting against an annular portion of the insulating body, the radial outer extremity of the annular portion corresponding to the diameter of the inner surface, each of said rings having a length in axial directions which is greater than the length of the insulating body at the corresponding side of the insulating body and which is at least 100 mm.