Comparison between Various Systems of Power Transmission | Electricity
Though in practice 3-phase 3-wire ac system is universally used for power transmission and 3-phase 4-wire ac system is used for distribution of electric power but for special purposes other systems may also be used. Various Systems of Power Transmission: The various systems of power transmission are: (a) DC Systems: (i) DC two-wire system. (ii) DC two-wire system with mid-point [...]