Low price for Tr-227 Station Post Insulator - 11kn AS Standard PW-22-A Pin Type Porcelain Insulator – Johnson

Type of pin insulator

1. Ordinary pin type insulator
Pin type common ceramic insulator porcelain parts and cast steel are glued together with cement adhesive, and the surface of the porcelain parts is coated with a layer of glaze to improve the insulation performance of the insulator. A moisture-proof agent is applied to the surface of the adhesive where the cast steel and porcelain are cemented.
The main reason why the overhead line is prone to lightning strike and dirty flashover is that the pin insulator of the line is polluted and moisture absorption in rainy days, and the insulation level is reduced, so that the pollution flashover and breakdown cause the line failure.
Needle type common ceramic insulators can continue to operate sometimes in clear weather after cracks or severe bruisings occur; But encounter light rain, fog weather, insulation on a sudden drop, causing line failure.
In addition, when the needle type common ceramic insulator has a slight crack, it is difficult for line inspectors to find the defect even with their hand telescopes, which leaves a safety hazard for the line and increases the unsafe factor of the line operation.

2. Lightning protection pin type insulator
The patented puncture structure can penetrate the insulation layer of the wire installed in the slot to form an electrical connection; The unique ignition arc fork is closely connected with the upper end of the insulator through a bolt, and the other end is a discharge end, forming a discharge gap with the grounding electrode installed on the lower end of the insulator. And an insulation cover wraps all exposed parts of the upper end of the insulator except the arc fork discharge end.
Under normal conditions, the discharge gap of the surge insulator does not operate; Only when the lightning overvoltage exceeds the specified, the gap between the arc fork and the grounding electrode can be broken down, forming a short circuit channel. The connected power frequency arc will burn on the arc fork of the line clip, releasing the overvoltage energy to protect the wire from burns.