How to determine Substation Voltage Drop & Short Circuit using Per Unit Calculation

Per unit system as a basis for calculation

Select 100MVA Base

All impedance, voltage and currents  & power flows are converted to Per unit

Express all Quantities in Dimensionless Units

Lets Start the calculation:-

Step No.1:-

Step No.2:-

Step No.3:-

 Step No.4:-

 Step No.5:-

 Step No.6:-

  calculate for 33kV system

 calculate for 11kV system

Single Line Diagram