Knowledge

​Composite insulators can be divided into: line composite insulators and power station, electrical composite insulators.

​In wet weather, dirty insulators are prone to flashover and discharge, so they must be cleaned to restore the original insulation level.

​The main function of insulators is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified.

Good selectivity. Good current limiting characteristics and high breaking capacity. Relatively small size. The price is cheaper.

​The same point is that short-circuit protection can be achieved. The principle of the fuse is to use the current flowing through the conductor to make the conductor heat up.

Check the appearance of the fuse (remove the fuse tube) for damage and deformation, and whether the porcelain parts have discharge and flicker marks.

Before installing a new melt, find out the cause of the melt fuse. If the cause of the melt is not determined, do not replace the melt for test delivery.

​When the melt is blown, carefully analyze the cause of the fuse. The possible reasons are: Normal fuse due to short-circuit fault or overload operation.

Check the appearance of the fuse for damage and deformation, and the porcelain insulation for flicker and discharge traces.

The open fuse has a simple structure, the melt is completely exposed to the air, and is supported by a porcelain column without a support, which is suitable for low-voltage outdoor