Choice
Overhead lines: equipment - Insulators

The insulators are selected :

• as a function of line operating voltage ;

• depending on the mechanical stresses to which they are subjected (weight of conductors and ice, wind action, mechanical tension of conductors, if any) ;

• with regard to their nature (rigid or suspended), depending on the cost of the line and its size; in general, for small cross-sections (< 50 mm²), a line on rigid insulators is less expensive than a line on suspended insulators, at least in regions not subject to significant climatic overloads;

• depending on site pollution.

Studies carried out in France and abroad show that the most important factor in resistance to pollution is the insulator's creepage...