Basic Electrical Engineering

Types of poles – Wooden poles, Concrete poles, Tubular steel poles, Latticed steel tower

Types of poles

Line supports or the poles which hold the conductors to a height they are above the ground level. In general, four types of poles are used, depending on the size and shape of the conductor used.

i. Wooden poles

ii. Concrete poles

iii. Tubular steel poles

iv. Latticed steel tower

i. Wooden poles

The wooden pole structure used for LV transmission lines. The limitations of wooden poles are that they must be straight, strong with gradual tapper and free from knots. These poles are cheap. Some portion of the pole below the ground level is impregnated with preservative compounds like creosote oil. These poles are suitable for shorter spans between 40 m to 50 m and voltage level of 11 KV.

ii. Concrete poles

The concrete poles are strong and reinforced with iron is it. They have high mechanical strength, long life, durability and working conditions. These poles are used for longer spans (80 m to 100 m). The maintenance cost is very low. These types of poles are used to transmit up to 33 KV.

iii. Tubular steel poles

The iron tubular pipe. This structure is stronger than the concrete pole. The poles are coated with zinc plating. In the same tube, more than one pipe is plugged or attached. Since the tube is circular shape, the air pressure attack is less than the concrete pole. These types of poles are required to be earthed. These are suitable for low voltage areas such as street lighting. This type of pole is suitable for the span between 50 m to 80 m.

iv. Latticed steel tower

A Latticed steel tower. These are designed to be of greater strength and longer life. The purpose of this tower is to carry a high voltage through the conductor to a long distance of high level. The span of the tower is 100m to 300m

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