polyphase current

Polyphase current refers to electrical systems that produce or involve two or more phases. A common example is three-phase power, which uses three alternating currents that are out of phase with each other by one-third of a cycle. This type of current is fundamental to the operation of polyphase induction motors.123

Electric generators, particularly those supplying power networks, typically produce alternating current. In many applications, such as power grids, generators are designed as synchronous generators that produce a sine wave output. For efficient transmission and distribution, these generators often operate in a three-phase system, allowing power to be transmitted using three conductors. This system is advantageous for powering electric motors and other industrial equipment.43