Insulator Ridges and Their Electrical Function

The fins or ridges along the sides of insulators serve a crucial role in extending creepage distance, which is the surface path electricity must follow. This design minimizes leakage current across the insulator’s body, particularly under wet or polluted conditions. By preventing water films from forming a continuous conductive layer, the ridges ensure improved electrical insulation. Their size and number are adjusted for higher voltages, making them essential in power line and substation applications.

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