Part of Power Transmission Tower
Written by faizul hadi on 1:14 AM
From wikipidea, An electricity pylon or transmission tower is a tall, usually steel lattice structure used to support overhead electricity conductors for electric power transmission.
Transmission lines carry power long distances. High voltages (up to 765kV) are used because less power is lost as heat.
Steel towers can be spaced nearly a quarter of a mile apart. The cable is made with aluminum wire. Aluminum is a good conductor that is much lighter than copper. With lighter wire the towers can be spaced more widely so that fewer are needed.
The uninsulated cable can not be connected directly to the steel towers. Steel is also a good conductor and would give the electricity a path to the ground. The wire has to be hung from long stacks of glass insulators to keep the electricity separated.
At the top of the transmission towers, lightning arrester wires are connected directly to the steel tower so that lightning strikes will be grounded. Without the arresters, lightning could cause spikes, sudden sharp increases in the voltage that can damage transformers.
Even with the glass insulators and lightning arrester wires, powerful lightning strikes can still get into the power lines. This is what causes the lights to blink and sometimes go out during thunderstorms. Sensitive electrical appliances, especially computers, should be plugged into surge suppressors that protect them from spikes of high voltage.
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