Reactive Power Calculation

This web page can be used to calculate the reactive power (kvar) of a single phase or three phase load.  Use Table one for three phase calculations, and use Table two for single phase calculations. The three phase load calculations assume the load is balanced.

Table 1 - Calculation of Reactive Power Three Phase Loads

Known Variables: Load Voltage, Load Current, Load Power Factor Angle  

Input System Line-Line Voltage (kv)
Input line current (amps)
Input power factor angle of load (degrees)
Calculated Reactive Power (kvar)

Known Variables: Total Power (kva), Reactive Power (kvar)  

Input Three Phase Total Power  (kva)
Input Three Phase Real Power (kw)
Calculated Power (kvar)

Table 2 - Calculation of Reactive Power Single Phase Loads 

Known Variables: Load Voltage, Load Current, and Power Factor Angle of Load


Input System Line to Neutral Voltage (kv)
Input Line Current (amps)
Input Power Factor Angle (degrees)
Calculated Reactive Power (kvar)

Known Variables: Real Power (kw), and Total Power (kva)  

Input Single Phase Total Power  (kva)
Input Single Phase Real Power (kw)
Calculated Reactive Power (kvar)

Northeast Power Systems, Inc.
66 Carey Road
Queensbury, New York 12804
Phone: 518-792-4776
Fax: 518-792-5767

E-mail: sales@nepsi.com
Website: http://www.nepsi.com/