Electrical Engineering ⇒ Topic : 3phase Balanced Loads in Parallel

Daniel
 
3phase Balanced Loads in Parallel In a 3phase supply system, it is quite common to have balanced A and Y loads connected in parallel. Rarely the loads are all Aconnected or all Yconnected. The problems on such parallel loads can be solved by one of the following three ways : (1) All the Yloads in the problem may be converted into equivalent A loads. Then these loads in parallel (all now being A loads) can be treated on a singlephase basis (linetoneutral) to find the various circuit values e.g., currents, power factor etc. (2) All the A loads in the problem may be converted into equivalent Y loads and treated as in (i) above. Out of the above two methods, usually the latter is prefered because it is more convenient to handle Yconnection. (3) A still shorter and more commonly used method is to treat each load on a complete 3phase basis. The active, reactive and apparent powers in each 3phase load are determined. The active powers (watts) of the parallel loads can be added directly to give the total active power P. The reactive powers (VAR) of the parallel loads can be added algebraically (with due regard to the *signs of inductive VAR and capacitive VAR) to give the total reactive power Q. Then total apparent power S (in VA) is given by
The various characteristic quantities (e.g., power factor, line current etc.) can be easily,determined for the combined loads  
 
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