High-voltage-resistant current bushing device through a vacuum space which encloses the winding of a superconducting large magnet

摘要

A high-voltage-resistant current bushing device extends through a vacuum space which encloses a magnet winding which contains a superconducting hollow conductor which is to be cooled in a forced manner and has a cured resin cast around it to form a compact body. Provided on one conductor end which is passed out of the cast body and extends through the vacuum space is a coolant supply pipe which encloses the conductor end and whose termination is constructed as a pressure-resistant potential-isolating device having a high-voltage-resistant insulation section. In the case of this current bushing device, it is intended to ensure, in particular, an adequate breakdown resistance of the insulation section and, at the same time, good mechanical stability. To this end, the invention provides that the potential isolation device (10) has two tubular subelements (13, 14) which are arranged concentrically with respect to one another and form a common connecting part (16) on their one adjacent edges, and whose opposite edges (18, 19) are connected in a vacuum-tight manner to the coolant supply pipe (6) and to the hollow conductor (4), and that the potential isolating device (10) is arranged in an annular groove (11) of the cast body (2) which encloses the hollow-conductor end (3, 4), and has further cured resin cast around it there. IMAGE