Current transmission system for HVDC including a solid insulator

Details Current transmission system for HVDC including a solid insulator Current transmission system for HVDC including a solid insulator

1986-10-14

1987-08-18

Askin, Laramie E.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

174 28, 174 99B, 174140C, 363 51, 363144, H02M 700, H02B 120, H02G 506, H01B 1742

Patent

active

046881425

ABSTRACT:
A system for HVDC transmission comprises a conductor, stressed by d.c. voltage, which is insulated from a surrounded grounded casing by pressurized SF.sub.6 gas and along part of its length by at least one solid insulator supporting the conductor in the casing and in contact with the gas. By designing the solid insulator as a core of solid insulating material and a coating, provided thereon, with a high surface resistance, it is possible considerably to reduce the dimensions of the casing. The coating consists of a resinous binder containing a powdered filler in the form of chromium oxide or iron oxide, or a mixture of these substances. The coating preferably has a surface resistance between 10.sup.12 and 10.sup.18 ohm/.quadrature. at an electric field strength of 1 kV/mm.

REFERENCES:
patent: 2154387 (1939-04-01), Sleeman
patent: 2797175 (1957-06-01), Horton
patent: 4142230 (1979-02-01), Menju et al.
patent: 4166193 (1979-08-01), Schmidt et al.
patent: 4447671 (1984-05-01), Czech et al.

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