Why are bundled conductors used in transmission lines?

Bundled conductors are utilized in transmission lines primarily to increase capacity and reduce losses. The use of multiple conductors bundled together allows for the effective handling of higher currents without significantly increasing the size and weight of the conductors. This design helps to reduce the electrical resistance encountered in the line, which in turn minimizes power losses due to heat generated from that resistance.

Moreover, the bundling of conductors helps mitigate the effects of transmission line phenomena, such as the skin effect, wherein alternating current tends to travel near the surface of a conductor. By providing a larger overall surface area through the grouping of multiple conductors, it enhances the current-carrying capacity of the line.

In addition to reducing losses, this approach also addresses issues related to electromagnetic interference and corona discharge, which can affect overhead lines. Overall, these benefits contribute to the efficient and reliable performance of high-voltage transmission systems.