Electric power is in great demand, and it is transmitted to distant places for consumers with high efficiency, where insulators are used to transmission and distribution line for insulation.
Insulators which had been contaminated by salt particles caused flashovers on this surface under high voltage in humid climate and light rain.
Exposure tests of insulators in Okinawa Island have been carried out with exposure period ranging over 1 month, 3 months, a half year and as often as necessary since about 1979. This report concerns on salt contamination of insulator surfaces by typhoons in Okinawa Island. A summary of the results obtained from the exposure tests are:
(1) Maximum salt contamination is caused almost all by typhoons.
(2) Mountains form shelters against salt contamination in wind direction.
(3) Precipitation during a typhoon has a great influence on salt contamination of insulator surfaces.
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