ABSTRACT
The function of the overhead (OH) three-phase electric power transmission line is to transmit bulk power to load centers and large industrial users beyond the primary distribution lines. A given transmission system comprises all land, conversion structures, and equipment (such as step-down transformers) at a primary source of supply, including interconnecting transmission lines, switching, and conversion stations, between a generating or receiving point and a load center or wholesale point. It includes all lines and equipment whose main function is to increase, integrate, or tie together power supply sources.
