Abstract
The insulation desi8n of Indian hi&h voltage
lines has to eater to greatly varying geographical
and geopeysical conditions with a fairly high
degree of reliabilitf 1 the actual line outage rate
(per 1 oo km per year) for 132 kV, 220 kV and 400kV
lines being less than 1.5, 1.0 and 0.4 respectively.
Electromechanical tests on complete strings,
more strict acceptance ratios for tests on individual
discs, a test criterion to ensure less
than 0.37 ?b failure rate and use of higher strength
discs to compensate for strength reduction
when used as complete strings, are some of the
improvement measures presently llllder consideration
for Indian systems.
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