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Abstract
Experimental investigations on the tracking breakdown of insulating materials caused by A.C voltage by the IEC (International Electrotechnical commission) 112 method have been carried out in this thesis. The present work introduces further investigations into the effect of creepage stress on the insulating tracking for some of the widely used polymeric insulating materials in outdoor electrical equipment. Experiments on creepage current are implemented under contaminated test DROPs for different polymeric insulants such as: Bakelite (Ba), polyvinyl chloride (PVC) and polystyrene (PS). Thereby all factors affecting the tracking breakdown have been considered such as applied voltage, distance between electrodes, type of test contaminant solution, time to DROP, size of DROP, temperature and moisture. A data acquisition system is constructed to register the creepage current values to record and checked the creepage current. The experimental results, which have been obtained in the present study, are illustrated and discussed. As theoretical application, the electric field distribution has been computed by the charge simulation method. The calculations have been obtained for ieC standards 112 and 587 used in this work for a wide range of different parameters. The validity of the results has been checked by comparing the computed values with those measured experimentally. The agreement is found to be quite good.