Abstract
The gas-filled cable system has been in commercial operation for 20 years, and since it was first described before The Institution in 1943 it has been modified in many points of detail as a result of very considerable service experience and intensive laboratory investigations.After a brief note on the construction of the cable, a detailed description is given of the unique pre-impregnation process and the experimental work which has been carried out to study the effects of the dielectric, quality of impregnation, material and constructional variables. A description then follows of the design of accessories, testing of cables and miniature systems and of present-day installation methods.Operational experience with the system is discussed fully, and the modifications resulting from service incidents are detailed. The paper concludes with indications of possible future trends of development which, it is considered, will lead to further technical and economic improvements.
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