What Is The Principle Behind The Protective Function Of Insulators In Reducing Tripping Due To Lightning Strikes?

Under the influence of lightning strikes or induced lightning voltage, a high-amplitude, rapidly rising overvoltage occurs in the line, which may form a flashover path at the end of polymer deadend insulator or near the grounded metal structure. In this case, by setting a parallel discharge gap or bypass device at or near porcelain dead end insulators, part of the lightning current can be directly conducted to the ground or bypassed through a low-resistance path, without first breaking down the interior of suspension insulator or causing power frequency follow current to be generated in the line.