Assessing the Aging Effects of Ion Concentration, pH and Conductivity of Acid Rain on Contamination Performances of Silicone Rubber Insulator

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Abstract

Acid rain is the precipitation of pH lower than 5.6, of which the main features are ion concentration, acidity pH, and conductivity. As there exit a considerable variety of acid rains originated from different sources, the characteristics of acid rain are different in various industry areas. Although there have been some studies on the erosion effects of artificial acid rain on the insulating materials, the mechanism and extent of influences of ion concentration, pH, and conductivity of varied acid rain remain to be resolved. In this paper, the degradation effect of acid rain on the high temperature vulcanizing silicone rubber (HTVSR) insulator is investigated by the accelerated aging of artificial acid rain. The influences of ion concentration, pH, and conductivity of acid rain on the material structure, hydrophobicity, and surface discharge current of insulator are respectively studied. Experimental results reported here show that conductivity of acid rain mainly induces the tracking and discharge on the energized insulator surface, and the acidity pH affects the inorganic filler in silicone rubber. The erosion effect of acid rain on the energized insulator is more severe than that on the insulator without applying voltage. Variation of conductivity hardly has influence on the insulator without applying voltage. Although the insulator surface degrades with the increasing of ingredient concentration, when the ion concentration is too high, the degradation of insulator has a trend toward saturation. The ingredient concentration of actual acid rain exerts an insignificant effect on the degradation of silicone rubber insulator. Owing that the atom bond structure of Si-O bond in silicone rubber has a high band energy, silicone rubber insulator presents a large resistance to the varied acid rain.

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