The Role and Importance of Insulators
2025-12-02
Insulators, commonly known as porcelain insulators, are insulating devices used to support conductors. In earlier times, insulators were mainly used on utility poles. Over time, they evolved to be suspended in large numbers at one end of high-voltage transmission towers—these disc-shaped insulators serve to increase the creepage distance. Typically made of glass or ceramic, they are referred to as insulators.
Insulators ensure that conductors maintain sufficient insulation from crossarms and tower structures. In overhead transmission lines, insulators serve two fundamental functions: supporting the conductors and preventing current from flowing back to ground. During operation, they must be able to withstand both the vertical load exerted by the conductors and the horizontal tensile forces acting on them. Additionally, insulators are exposed to sunlight, rain, climate fluctuations, and corrosion caused by chemical substances. Therefore, insulators must possess not only excellent electrical performance but also adequate mechanical strength. The quality of insulators is critically important for the safe operation of transmission lines.
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