Therefore, the three voltages E NR, E NY and E NB are equal in magnitude but displaced from one another by 120° electrical. The Star connection is shown in the figure below:Īs the system is balanced, a balanced system means that in all the three phases, i.e., R, Y and B, the equal amount of current flows through them. Relation Between Phase Voltage and Line Voltage in Star Connection Similarly, the voltage across each phase is called Phase Voltage E ph, and the voltage across two line conductors is known as the Line Voltage E L.
The current flowing through each phase is called Phase current I ph, and the current flowing through each line conductor is called Line Current I L. The three conductors named as R, Y and B run from the remaining three free terminals as shown in the above figure. The star connection is shown in the diagram below:Ĭonsidering the above figure, the finish terminals a 2, b 2, and c 2 of the three windings are connected to form a star or neutral point.
However, sometimes a fourth wire is carried from the star point to the external circuit, called neutral wire, forming three-phase, four-wire star connected systems.
Resistances of three winding should be same (+/- 5). The wires are carried to the external circuit, giving three-phase, three-wire star connected systems. Measure resistance for each winding, resistance between two different winding and resistance between winding and motors frame.
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