Porcelain pin type insulators for high voltage

    The porcelain piece and cast steel of the needle type common ceramic insulator are glued together with cement adhesive, and the surface of the porcelain piece is coated with a layer of glaze to improve the insulation performance of the insulator. Apply a moisture-proof agent to the surface of the glue where the cast steel and porcelain parts are glued.
The main reason why overhead lines are susceptible to lightning strikes and pollution flashovers is that the pin insulators of the lines are contaminated and absorb moisture in rainy days, and the insulation level is reduced, resulting in line failures caused by pollution flashovers and breakdowns.
    After a crack or serious hard injury, the pin-type ordinary ceramic insulator can sometimes continue to operate in fine weather; but in light rain and foggy weather, the insulation will drop sharply, causing line failure.
In addition, when a slight crack occurs in the needle-type common ceramic insulator, even if the line inspector holds a telescope, it is difficult to find the defect, which leaves a safety hazard for the line and increases the unsafe factor of the line operation.