transmission tower

A transmission tower (also electricity pylon, hydro tower, or pylon) is a tall structure used to support an overhead power line. It is usually a lattice or tubular tower made of steel. In electrical grids, transmission towers carry high-voltage, transmission lines that transport electric power from generating stations to electrical substations; while utility poles are used to support lower-voltage, electricity contactor relays, sub-station, sub-transmission lines or distribution lines that transport electricity from substations to electricity installed capacity to end customers.

There are four categories of transmission towers: (i) the suspension tower, (ii) the dead-end tower, (iii) the termination tower, and (iv) the transposition tower. The heights of transmission towers typically range from 15 to 55 m (49 to 180 ft), although when longer spans are needed, such as for crossing water, taller towers are sometimes used.