Abstract
The authors first give a short description of the existing 225-kV underground system of the Paris area, where oil-pressure pipe-type cables have been mainly used since 1954. The new plans of development of this system call for new 225-kV cables, which will supply 225/20-kV distribution substations right in the heart of the city. Self-contained single-conductor cables would probably present some advantages for laying along such difficult urban routes. This is the reason why oil-filled aluminum-sheathed cables are being studied for possible future use. However, all the corresponding problems do not seem to be solved yet.
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