post insulator vs suspension insulator

What are the functions of pillar insulators
A lot of disc-shaped insulators are hung at one end of the High-voltage wire connection tower. It is to increase the electrical distance. It is usually made of glass or ceramic or rubber, which is called an insulator.
Its function is to reduce the capacitive reactance between wires to reduce the loss of current.
In order to prevent dust and other contaminants from adhering to the surface of the insulator, the formation of a path is broken down by the flashover at both ends of the insulator, that is, creepage, so increase the surface distance, that is, the creepage distance, along the insulation surface.
The distance of the surface discharge, that is, the leakage distance, is called the creepage distance, and the creepage distance = the surface distance/the highest voltage of the system. According to the degree of pollution, the crawling distance is generally 31 square meters/sea in heavily polluted areas.
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A zero-value insulator refers to an insulator whose potential distribution across the insulator is close to or equal to zero during operation. Effects of zero or low value insulators: insulation of line conductors
Depending on the insulator, due to manufacturing defects or external effects, such as: the surface of the insulator is too dirty, lightning strikes, etc. The insulation performance of pillar insulators will continue to deteriorate, when the insulation resistance
When it is reduced or zero, it is called a low value or zero value insulator.