Abstract
This report describes the work carried out to develop a
delta 420 kV compact line with 5 m phase spacing,
utilising line surge arresters and eliminating shield
wires. Long term audible noise measurements were
taken on a full-scale outdoors test line. Special grading
rings were developed and tested. The design is based.on
tension towers only, to overcome the clearance
problems of short insulator strings on compact towers.
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