Electric power transmission is a critical link between electricity generation and distribution, enabling bulk transfer of high-voltage power over long distances. This paper reviews the fundamental principles of AC and HVDC transmission systems, the physical infrastructure (overhead lines, underground cables, substations), and operational challenges including line losses, stability, and environmental impact. It concludes with an analysis of emerging technologies such as flexible AC transmission systems (FACTS), high-temperature low-sag (HTLS) conductors, and smart grid integration.
Power loss in a line is given by ( P_loss = I^2 R ). For a given power ( P = VI \cdot \cos\theta ), increasing voltage ( V ) reduces current ( I ), thereby reducing losses. Doubling voltage cuts current by half and losses by a factor of four. electric power transmission pdf
The physical conductors—classified as short (under 80 km), medium (80–250 km), or long (over 250 km)—that carry power. Electric power transmission is a critical link between