Pin-type insulators find their application in the field of Electrical Power Transmission and Distribution. Given below is basic introduction, working, and application of pin type insulators.
A pin-type insulator is a type of electrical insulator that comprises a porcelain material and is mounted on a metal pin, that is attached to a cross-arm or other support structure. The metal pin provides mechanical support to the insulator, while the insulator itself provides electrical insulation between the conductor and the support structure.
The pin-type insulator is secured to the cross-arm on the pole.
At the upper end of the insulator, there is a groove designed to accommodate the conductor, which passes through it and is secured by an annealed wire made of the same material as the conductor.
The figure below displays a pin-type insulator.
Pin-type insulators are commonly utilized in the transmission and distribution of electric power at voltages of up to 33 kV. However, beyond this operating voltage, these insulators become too large and consequently less cost-effective.