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Voltage Regulation

الكلية كلية الهندسة     القسم  الهندسة الكهربائية     المرحلة 2
أستاذ المادة حيدر محمد علي الخفاف       5/28/2011 8:13:14 AM

Voltage Regulation:

 

 

         Compare the secondary voltage at no load with the secondary voltage at full load. This determines the impact of the voltage drop across the series branch.

 

 

VR =    [(V_{s-no load} – V_s-full load)/ V_{s-no load}] *100%    (voltage regulation down)

 

 

OR    VR =    [(V_{s-no load} – V_s-full load)/ V_s-full load] *100%    (voltage regulation up)

 

 

 

• Vs is the secondary voltage (or V2).

 

• This is calculated using the voltage magnitudes, not the angle.

 

• Small numbers are often considered good.

 

• In some cases, a larger series impedance is preferred, since it will lower fault currents. But it hurt the voltage regulation.

 

 

Efficiency:

 

What percentage of the power in to the transformer is available at the output.

 

 

? = (P_out / P_in)*100%

 

 

OR  ? = (P_out /(P_out+P_losses))*100%

 

 

P_losses consists of: 1. Copper losses in windings

 

                             2. Eddy current losses in core

 

                             3. Hysteresis losses in the core.