What fraction of the total weight of conductor is required for a three-phase transmission system compared to a single or two-phase system?

In a three-phase transmission system, the conductor's weight plays a crucial role in balancing the electrical loads and optimizing the efficiency of power transmission. The correct answer, which indicates that three-quarters (3/4) of the total weight of conductor is required for a three-phase system compared to a single or two-phase system, reflects the increased efficiency and load-carrying capability of three-phase systems.

A three-phase system utilizes three conductors for the transmission of power simultaneously, sharing the load among multiple paths. This setup allows the system to operate at a reduced conductor weight compared to the combined weight needed if using multiple single-phase conductors or just two-phase conductors for the same power capacity.

In contrast, other configurations like single or two-phase systems require more conductor material to reliably transmit similar amounts of power. This systematic reduction in conductor weight benefits three-phase systems, as they can maintain stability and efficiency while using less material compared to relying solely on a single or two-phase arrangement.

Understanding the dynamics of conductor weight in relation to phase systems is essential for engineers and practitioners in power transmission, as it influences material use, cost, and overall system performance.