Electrical Engineering ⇒ Topic : Methods of Solving Unbalanced 3wire Y load

April
 
Methods of Solving Unbalanced 3wire Y load The unbalanced 3wire Y load is the most difficult unbalanced 3phase 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 cunent method (3) By Y/Δ Conversion. In this method, unbalanced 3wire Y load is converted into equivalent Δ load. The problem is then solved as a Δconnected system. The line cunents 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 V_{N'N} (i.e., potential of load neutral N' w. rt. supply neutral IV) in an unbalanced 3wire Y load. Once V_{N'N} is known, the load phase voltages and line currents of unbalanced Y load can be easily calculated  
 
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