Why increase in excitation increases RMVA and not MW on a generator?
Please try to explain without using vector diagram and mathematical formulas.
Load in MW of generator depends on Actual working load connected on that generator that is 1.732 X V X I X cosø X 1000. If we increase excitation that increase excitation current so magnetic flux increase and stator voltage increase. Increased stator voltage increase magnetic flux of all inductive load like motot etc..connected with generator,so reactive power increase and power factor decrease. MW depends on load (pump,compressor,thermal etc..) Changing excitation will change reactive power sharing only. So that in Generator Increased voltage will decrease Power factor.
Load in MW of generator depends on Actual working load connected on that generator that is 1.732 X V X I X cosø X 1000. If we increase excitation that increase excitation current so magnetic flux increase and stator voltage increase. Increased stator voltage increase magnetic flux of all inductive load like motot etc..connected with generator,so reactive power increase and power factor decrease. MW depends on load (pump,compressor,thermal etc..) Changing excitation will change reactive power sharing only. So that in Generator Increased voltage will decrease Power factor.