Abstract
In Pakistan, especially in Karachi area, insulator
contamination is the most serious design and maintenance
problem in power transmission lines. W APDA, Pakistan
and NGK, Japan cooperated to conduct the systematic
insulator contamination survey along the trunk
transmission lines from Karachi to Tarbela in Pakistan.
Very high ESDD values were measured, approx. 0.8
mglcm2 was measured in Karachi area near seacoast and
0.4 - 0.5 mglcm2 even in the area near Jamshoro more
than 100 km far from seacoast. In inland area, 0.03 -
0.05 mglcm2 were the max. values actually measured.
Based on the measuring results, design ESDD values
for all the sites investigated are proposed.
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