Three-phase systems are the industry standard for long-distance power transmission and offer several significant advantages over single-phase systems. Most notably, they are more efficient and economical. A 3-phase system can transmit three times the power of a single-phase system with only one additional conductor, requiring less conductor material for a given power level. The constant and smooth power delivery in a 3-phase system also reduces mechanical stress and vibrations in large equipment like motors and generators, leading to longer lifespans and better reliability. This efficiency and stability are crucial for large-scale power infrastructure projects.