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The discharge characteristics of dc insulators under contaminated conditions are investigated. The multiple-arc model, previously developed, is generalized to analyze the three dimensional case of practical insulator configurations. An empirical formula is introduced to account for the effectiveness of the insulator creepage length by considering the actual arc path from one underrib to another (tip-to-tip)...
A successful accelerated corrosion test method, the wick test, has been developed to simulate the corrosion process of semi-conductively glazed material in actual operation. The wick test is efficient and reproduces the characteristics of semi-conducting glaze corrosion that can be expected to occur under operating conditions. Through wick test, some of the parameters affecting the deterioration rate...
If the thermal effect of semiconductive1y glazed insulator is to keep the whole insulator dry in a moist environment, the thermal model can be used to design an insulator glaze which minimizes total power loss without any unacceptable compromise in reliability.
This paper describes an integrated field and laboratory test program conducted to determine the basic degradation process of new high voltage insulating materials (i.e., grease, polymer, semiconducting glaze) under outdoor life conditions. The field tests were conducted on rod samples at Southern California Edison's Mandalay Insulator Test facility; while laboratory studies were performed at the University...
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