The number of insulators is related to the local pollution level.
If your pollution level is III, you should choose 16 single insulators with a creepage interval of 450mm.
The type of insulator is related to its load bearing, which is related to the load and span of the conductor connected by the insulator.
Therefore, the type and number of insulators are still carefully selected after calculation according to the regulations. Power planning is not a trivial matter and should be held for life.
About common sense
One end of the high-voltage wire connection tower is hung with many disc-shaped insulators. It is used to add creepage intervals. It is usually made of glass or ceramics and is called an insulator.
In order to avoid the adhesion of floating dust and other contaminants on the surface of the insulator, the path is broken by the voltage at both ends of the insulator, that is, creepage. Therefore, increase the appearance interval, that is, the creepage distance, and the interval of discharge along the insulation surface is the leakage interval. Interval/highest voltage of the system. According to the degree of contamination, the creep distance is usually 31 mm/kV.