There are cases where, due to environmental factors or in order not to spoil a particular landscape, it is impossible to use overhead power lines. In the past, the only alternative in such situations has been to use cable with an reduction of power transmission capability. Now, however, there is another alternativegas-insulated transmission lines (GIL). These lines are a further development of the tubular conductor intended for long distances and are especially suitable for connecting conurbations to centers of power supply. They are also as "invisible" as ordinary power cables as well as having a number of other 0-7803-5935-6/00/$10.00 (c) 2000 IEEE
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