Interconnection of 3 Phase System
In a three-phase AC generator, there are three windings. Each winding has two terminals (start and finish). If a separate load is connected across each phase winding as shown in the figure below, then each phase supplies as independent load through a pair of wires. Thus, six wires will be required to connect the load to a generator. This will make the whole system complicated and costly.
Therefore, in order to reduce the number of line conductors, the three phase windings of an AC generator are interconnected.The interconnection of the windings of a three phase system can be done in following two ways
Star or Wye (Y) connection
Mesh or Delta (Δ) connection.
Connection of 3 Phase Loads in 3 Phase System
As the three phase supply is connected in star and delta connections. Similarly, the three-phase loads are also connected either as Star connection or as Delta Connection. The three phase load connected in the star is shown in the figure below.
The delta connection of three phase loads is shown in the figure below.
The three phase loads may be balanced or unbalanced as discussed above. If the three loads Z1, Z2 and Z3 have the same magnitude and phase angle, then the 3 phase load is said to be a balanced load. Under such connections, all the phase or line currents and all the phase or line voltages are equal in magnitude.
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