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Published Article / ENY-ARTICLE-2012-320

Pollution flashover of long rod insulators with different profiles.

Chrzan, K L (Wroclaw University of Technology) ; Vokalek, J (EGU HV Lab. Prague, Czech Republic) ; Sklenicka, V (FGH Mannheim, Germany) ; Petrusch, W (Munich University of Technology, Germany) ; Kindersberger, J (Wroclaw University of Technology)


Abstract: Pollution test of four long rod insulators with different shapes were carried out according to flow on, salt fog and solid layer methods. The following porcelain insulators were investigated: a standard type insulator VKL75/14 with 14 sheds, an insulator with 15 stepped sheds LPZS 75/15, an insulator with alternating sheds LPZ 75/37W, and a screw type insulator LPS 75/11. During tests the flashover voltage, leakage currents, layer conductivity, salinity of water spray or salt deposit density were measured. The discharge activity and dry band pattern on insulators were observed. The flashover voltage (FOV) of insulator with stepped sheds according to salt fog and solid layer method was higher than the FOV of insulator with alternating sheds in spite that the leakage distance of insulator LPZ75/37W was longer. On the other hands the FOV of screw insulator was lowest due to the formation of single dry band at the upper flange.

Keyword(s): alternating sheds ; spiral insulator ; stepped sheds
Note: 13th Int. Symposium on High Voltage Engineering ISH, Delft, Netherlands 2003

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