Abstract
An outline is given of the development the U.K. overhead line network since its conception in 1930,
together with details of the various designs in common use today. The principal changes in the parameters
which are assumed in the designs are given.
Mention is made of the system fault reporting system used within the CEGB and indices are quoted
showing the quality of the system against fault induced losses in supply. A majority of overhead line
faults are shown to be induced by meteorological conditions of which wind and gale are particularly
troublesome. Analysis of weather conditions at times of fault has enabled indices of fault risk to be calculated,
allowing some comparison of performance to be made between lines of differing design.
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