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single phase supply vs three phase supply-Difference between single phase supply and three phase supply

This page on single phase supply vs three phase supply describes basic difference between single phase supply and three phase supply.

A three-phase supply system is a combination of three single phase supply systems. In a three phase balanced system, power comes from a 3φ AC generator which produces 3 separate and equal voltages. These voltages are 120 degree out of phase with the other voltages.

Following are the main comparison between these single and three phase supplies with respect to various features.

three phase AC supply

➨Three-phase equipment (motors, transformers, etc.) weighs less than single-phase equipment of the same power rating.
➨They have a wide range of voltages and can be used for single-phase loads.
➨Three-phase equipment is smaller in size, weighs less, and is more efficient than single-phase equipment.

Three phase supply systems can be connected in two different ways. If the three common ends of each phase are connected at a common point and the other three ends are connected to a 3-phase line, it is called Y-connection.

If the three phases are connected in series to form a closed loop, it is called D-connection.


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