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An introduction to transmission towers.

2022-06-27

An electric tower or a transmission tower is a tall structure, mostly a steel lattice tower which is used to support the overhead power lines. They carry heavy electrical transmission conductors at a proper height from the ground and these transmission lines must be able to withstand strong wind and snow load. In order to withstand these natural forces, its design must be done considering the structural and electrical requirements. Transmission lines can carry electricity over long distances at high voltages, the size and height of the tower is depended upon the stresses to which they are exposed


How can we determine the height of the tower
The height of the tower is determined by certain factors they are minimum permissible ground clearance, maximum sag, the vertical spacing between conductors, and vertical clearance between the ground wire and top conductor.

What is a stub-cleat arrangement 
The anchoring arrangement of transmission tower legs consisting of inclined angle with bearing cleats at the end, all embedded in the concrete foundation is called the stub or stub-cleat arrangement. 
A stub should be set in a manner so that the distance between the stubs, their alignment and slope are as per design and drawing. 

What are the conductors which are used in transmission power lines 

Conductors are used to transmitting electrical power in a transmission system, mostly the conductors are made up of aluminum with a steel core. These conductors are bare and the air around them provides insulation. The conductors which are used are created by twisting several wires together, bundled conductors are used on high voltage power lines to reduce energy losses, audible noise, and radio interference. A conductor bundle is a series of two, three or four conductors which are kept apart by a spacer, spacer damper can separate bundled conductors and controls vibration caused by wind and ice buildup.