Needle type ordinary ceramic insulator porcelain pieces and cast steel are cemented together with a cement adhesive, and the surface of the porcelain pieces is coated with a glaze to improve the insulation performance of the insulator.
Needle type ordinary ceramic insulator porcelain pieces and cast steel are cemented together with a cement adhesive, and the surface of the porcelain pieces is coated with a glaze to improve the insulation performance of the insulator. The surface of the cement at the glue between the cast steel and the porcelain is coated with a moistureproof agent.
The main reason why an overhead line is vulnerable to lightning strikes and dirty flashovers is that the needle insulators of the line are subject to contamination and moisture absorption in rainy days, and the insulation level is reduced, resulting in flashovers and breakdowns that cause line failures.
After a cracked or severely flawed pin-type ceramic insulator, it may continue to operate even in fine weather. However, in the event of light rain and fog, the insulation will suddenly drop, causing line failure.
In addition, when a slight crack occurs in a needle-type ordinary ceramic insulator, it is difficult for the line patrolman to find the defect even when he is holding the telescope. This leaves a hidden danger for the line and increases the unsafe factors of the line operation.