High Voltage Post Insulator

Post insulators are high voltage (HV) insulators designed according to IEC, ANSI and other standards for power systems up to 1100 kV.

Post insulators are made from a piece of porcelain or composite material (silicone rubber). Due to their excellent mechanical properties, post insulators are widely used in different applications.

In distribution and transmission lines, post insulators are also known as line post insulators.

There are 5 types of line post insulators by design: tie top line posts, vertical clip top line posts, horizontal (stud mount) clip top line posts, horizontal (gain base) line posts and support post insulators.

When used as a connecting top post on power lines up to 69 kV, it is secured to the conductor through the top wire and replaces traditional pin insulators.

There is a clamp unit at the end of the insulator to hold the other 4 types. Post insulator support conductors can be installed horizontally on poles or vertically.

In substations and related applications, post insulators are also known as station post insulators. Station piles are usually installed in a vertical position to protect transformers, switchgear and other related components. It is subjected to bending and compressive forces in use. Two or more insulators can be assembled together for higher voltage applications.