Pin type insulators

As the name suggests, the pin type insulator is secured to the cross- arm on the pole. There is a groove on the upper end of the insulator for housing the conductor.

pin type insulator

Pin type insulators colors: White gray and brown.

The conductor passes through this groove and is bound by the annealed wire of the same material as the conductor. Pin type insulators are used for transmission and distribution of electric power at voltages upto 33 kV. Beyond operating voltage of 33 kV, the pin type insulators become too bulky and hence uneconomical.

Pin type insulators are used for the transmission of lower voltages. A single pin type insulator is used to transmit voltages up to 11 kV (kilovolts) and higher voltages require two-, three- or four- piece pin insulators. They are not economically feasible for 33 kV and higher transmission lines.

Pin type insulators are secured with steel or lead bolts onto transmission poles. These are typically used for straight-running transmission lines.

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