Electrical Engineering ⇒ Topic : Methods of Solving Unbalanced 3-wire Y load
Methods of Solving Unbalanced 3-wire Y load
The unbalanced 3-wire Y load is the most difficult unbalanced 3-phase load to deal with. It is because load phase voltages cannot be determined directly from the given supply line voltages. Several methods have been developed to handle such unbalanced loads. Four frequently used methods are
(1) By Kirchhoff's laws
(2) By Maxwell's mesh cun-ent method
(3) By Y/Δ Conversion. In this method, unbalanced 3-wire Y load is converted into equivalent Δ load. The problem is then solved as a Δ-connected system. The line cun-ents calculated in the equivalent Δ load will be equal in magnitude and phase to those taken by the original unbalanced Y load.
(4) By using Millman's theorem. By using Millman's theorem, we can determine VN'N (i.e., potential of load neutral N' w. rt. supply neutral IV) in an unbalanced 3-wire Y load. Once VN'N is known, the load phase voltages and line currents of unbalanced Y load can be easily calculated
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