Abstract
The historical development of distribution networks, present day problems and the increasing demand
expected for the future, lead to the idea of introducing a H. V. distribution network ( 100-150 kV) in urban areas.
The M. V. (I 0-20 kV) network can then be reduced to a simple distribution network for connecting the M. V./ L. V.
( 380 V) transformers. This would give substantial economic advantages.
However, a pure distribution network gives a limited supply area to a transformer point. The economy
determines the optimum dimensions of this supply area. It is discussed that reserve is needed in the M. V. network
and H. V./ M. V. transformation for protection against supply interruptions in cases of cable faults and transformer
faults. In conclusion, mention is made of losses and automation .
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