Electricity: conductors and insulators – With fluids or vacuum – Conduit or cable joints
Patent
1987-06-29
1988-11-22
Askin, Laramie E.
Electricity: conductors and insulators
With fluids or vacuum
Conduit or cable joints
174 28, H02G 506
Patent
active
047867612
ABSTRACT:
A gas insulated electrical apparatus comprises a hermetic sheath having a plurality of electrically conductive sheath sections each including flanged ends and a fastening device for fastening the flanged ends of the sheath sections together. A high voltage conductor is electrically insulatably supported within the sheath sections by an electrically insulating spacer which has a substantially uniform circumferential flange portion and is hermetically and securely held at the outer periphery thereof between the flanged ends of the sheath sections. An electrically insulating gas is disposed within the hermetic sheath. An electrically insulating member is interposed between at least one of the flanged ends of the sheath sections and the circumferential flange portion of the insulating spacer such that one portion of the electrically insulating member is exposed inwardly with respect to the hermetic sheath. The electrically insulating member is made of a material having a lower dielectric constant than the insulating spacer, thereby preventing the electric field from locally concentrating in the vicinity of a triple junction of the insulating gas, the flange and the insulating spacer, so that the flashover characteristics of the insulating spacer are improved.
REFERENCES:
patent: 4730085 (1988-03-01), Hama et al.
Hama Hiroyuki
Yamamoto Hiroshi
Askin Laramie E.
Mitsubishi Denki & Kabushiki Kaisha
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