July 13, 2012

The three phase system has only two types of connections viz. star connection and delta connection. Why?

In the three phase system, the three phases should be so connected that we get a system that has equal line voltages displaced 120 degrees electrical from one another and acting simultaneously in the circuit. Only star and delta connections can satisfy these conditions. Any attempt made to connect the three phase in a manner other than these two schemes will result in a system of line voltages which are neither equal nor 120 degree displaced. Such a system will not serve the function as if three phase circuits being connected.
-V. K. Mehta


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