Difference between pin and post insulators is that Pin insulators are mounted on the cross-arm of pole of distribution lines, while post insulators are used in substations or related switching equipment.

Difference between pin and post insulators:
Porcelain station post insulators according to IEC, ANSI and other standards are used in substations and related switching equipment. They are produced in single piece up to 2300 mm and can operate voltages up to 1100KV in stacked configuration. Post insulators are subjected to compression, cantilever and torsional loads during service.

As the name suggests, the pin type insulator is mounted on a pin on the cross-arm on the pole. There is a groove on the upper end of the insulator. The conductor passes through this groove and is tied to the insulator with annealed wire of the same material as the conductor. Pin type insulators are used for transmission and distribution of electric power at voltages up to 33 kV. Beyond operating voltage of 33 kV, the pin type insulators become too bulky and hence uneconomical.

This article mainly introduces the difference between pin and post insulators by their different applications. The pin and post insulators above are porcelain insulators, and the composite insulators have the same applications with porcelain ones.
 

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