Essam A. Al-Ammar and Bahaa A. Arafa
High voltage, semiconducting glazed insulators, severe industrial pollution, flashover voltage
Overhead transmission lines insulators routing near chemical factories are suffering from industrial pollution that are characterized by industrial waste, gases produced from the factories chimneys’ in the form of rain or fog. Semiconductor glaze insulators (SCG) were introduced long time ago to face the pollution problems. Many people had studied these insulators from this point of view. Semi- conducting glazed insulators are advantageous as they have uniform voltage distribution on the surface and of keeping the surface dry, which greatly improves the behaviour under contamination. Field tests have been performed and actual applications have been studied before in light of environmental conditions. An experimental study was carried out in Egypt to investigate the effect of industrial climatic conditions near fertilizer factory on the performance of the semiconducting glazed insulators. The study includes the chemical analysis of the pollutants, dust deposit tests as well as flashover voltage of the naturally polluted insulators in clean fog. Furthermore, photographs showing the surface changes are also included in this study.
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