| Summary: | The discharge propagation on polluted layers of insulator surface in tropical country was studied to get information about the influence of impulse voltage. The leakage current at insulator surface caused by the applied impulse voltage was also investigated. The sample used in this study was cap-pin type of ceramic insulator of 146 mm x 254 mm, creepage length of 310 mm, and leakage distance of 280 mm. The applied impulse voltage used was based on the International Standard, IEC 1.2 x 50 [is . The method of simulation on the
mathematical expression of the contamination of an insulator surface was applied. It was found that the increase of impulse voltage, increased the discharge propagation velocity on the polluted layers of an insulator surface. However, with the increase of applied impulse voltage, the leakage current also increased, and this caused the increase of discharge propagation velocity. Thus, increasing the impulse voltage, both the leakage current and the discharge propagation velocity increased.
Key words : impulse voltage. leakage current and discharge propagation velocity
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