In order to study the effect of partial arc on the relationship between the leakage current and the surface conductivity under the saturated humidity condition, experiments were carried out in a small fog chamber.Moreover, the surface leakage current of U70B/146, U70BP/146D and triangular glass plates under different equivalent salt deposit density (ESDD) values were monitored by applying electricity and moisture, and the maximum value of leakage current was used to calculate the surface conductivity under different ESDD values. The test results show that when the partial arc appears on the surface of the sample, the calculated equivalent values of the surface conductivity of different types of insulators are different, and there is a great deviation from the actual value of the surface conductivity. The calculated equivalent value of surface conductivity of the triangular glass plate is almost the same as the actual value. The test results show that the appearance of partial arc changes the development path of current on the pollution layer, and then causes the change of shape coefficient, so that the calculated equivalent value of the surface conductivity of insulator is smaller than the actual value. When the leakage current is used to calculate the surface conductivity, the correction factor of U70B/146 is 1.82~2.86, and the correction factor of U70BP/146D is 1.18~1.33.
KEY WORDS :insulator;leakage current;surface conductivity;saturated humidity;partial arc;correction factor;
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