Air Clearances of Fully Composite Pylon

This chapter is related to the insulation coordination study to specify required electrical clearances on the fully composite pylon. The deterministic approach of insulation coordination study is described. Statistical behavior and failure risk of insulation along with the effect of statistical withstand voltage and statistical overvoltage on the risk of failure are implied. The insulation coordination procedure to calculate required electrical clearances on the fully composite pylon are presented. The obtained results are compared with the recommended values of standards and subsequently, internal and external air clearances at the tower top and within the mid-span are specified.