Gas-pressurised lapped-polythene dielectric for extra-high-voltage power-cable systems

1 January 1965

journal article
Published by Institution of Engineering and Technology (IET) in Proceedings of the Institution of Electrical Engineers

Vol. 112 (1) , 89-102
https://doi.org/10.1049/piee.1965.0014

Abstract

The paper describes an experimental investigation of the electrical, physical and mechanical properties of lapped-polythene dielectric. From the levels of impulse-breakdown stress and discharge-inception stress obtained, the use of this dielectric appears to be a promising method of operating low-permittivity low-loss insulation at stresses comparable with those currently employed in paper-insulated power cables at the highest transmission voltages. After consideration of other design aspects, a specification for 275 kV cable is given, based upon the experimental results obtained.The problem of providing terminations is also considered, and work leading to the design and testing of 275 kV capacitance-graded sealing ends is described.

Keywords

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