Particle trap contact for gas insulated transmission lines

Abstract From the Canadian patent

A gas insulated transmission line includes an elongated outer sheath at ground potential an inner conduc-, tor disposed within the outer sheath at high electrical potential, an insulating gas electrically insulating the inner conductor from the outer sheath, and an insulating spacer insulatably supporting the inner conductor within the outer sheath. An electrically conducting particle-trapping ring is disposed within, and spaced apart from the outer sheath, between the spacer and the outer sheath. The ring and the outer sheath form a low field region therebetween for the entrapment of conducting particles therein. The particletrapping ring is electrically connected to the outer sheath.