Post insulator is a type of high voltage (HV) insulator designed according to IEC, ANSI, and other standards, they are used in power systems up to 1100 kV.
The post insulator is made of one piece of porcelain or composite material (silicone rubber). Due to the excellent mechanical properties, the post insulator is widely used in different applications.
In the distribution and transmission line, the post insulator is also named line post insulator.