INSULATION PROPERTIES OF A STRING OF 3 UNIT SUSPENTION INSULATORS DEPENDING ON SEA-SALT CONTAMINATION AND SEA-FOG NEAR THE COAST OF PACIFIC OCEAN

输电线路绝缘子的绝缘性能受气象条件和环境条件的影响较大。在这份报告中，我们通过测量大气中的盐度来猜测海盐污染。根据本研究的观测数据，得出以下结论：(1)除台风期间外，试件绝缘子上表面的海盐污秽范围为0~10μg/cm~2，下表面的污秽为2μg/cm~2以下。认为一周左右的短期气象条件是造成海盐污染的主要原因。(3)当ESDD值超过30μg/cm2时，泄漏电阻降至10 6Ω以下。泄漏电阻低于10^6Ω表示样品绝缘子表面存在闪络危险。对于样品绝缘子下表面的漏电离散度与漏电阻关系不明显，几乎为2μg/cm^2或更低。

The insulation properties of a insulator for the power lines change greatly according to the meteorological conditions and the environmental conditions. In this report, we guessed the sea salt contamination from the measurement of salinity in the atmosphere. The following points are concluded from the observation data of this study.(1) The sea salt contamination on the upper surface of the specimen insulators ranged from 0 to 10μg/cm^2,and on the lower surface, contamination was 2μg/cm^2 or less, except during typhoons.(2) The contamination on the upper surface of the specimen insulators was affected by the washing-out effect from rainfall. It is thought that a short-term meteorological condition of about one week from several days is a predominant factor causing the sea salt contamination.(3) When ESDD exceeds 30μg/cm^2,the leakage resistance decreases below 10^6Ω. A leakage resistance of below 10^6Ω indicates that there is a danger of flashover occurring on the surface of the specimen insulators. For the ESDD on the lower surface of the specimen insulators, a correlation with the leakage resistance was not seen, and the ESDD are almost 2μg/cm^2 or less.