Voltage regulation calculator

Use the following calculator to calculate the Voltage regulation calculator to calculate voltage regulation precisely. Enter V_no-load and V_full-load and click on calculate button.

Voltage regulation calculator

Read more: Voltage regulation of transformer

Steps to use the voltage regulation calculator

• Enter the no-load terminal voltage:
  • Let’s assume: 440 V
• Enter the full-load terminal voltage:
  • Let’s assume: 550 V
• Click the calculate button. You should get an output of 15.3%

Definition

Voltage regulation of a transformer can be defined as the change in the magnitude of the secondary voltage of a transformer when the load changes from full load to no load, assuming a constant primary voltage.

Where,

• V_no-load is the no-load voltage measured across the secondary terminals
• V_full-load is the voltage measured across the secondary terminal at full load.

Percent voltage regulation

Normally, voltage regulation is expressed as either per – unit or percentage of load voltage

Example problem:

Consider a three-phase, star-connected alternator that is fully loaded at 0.8 lagging power factor. Below are the terminal voltage details:

• The line voltage measured at the alternator terminals at full load: 440 V
• The terminal voltage at no load with speed and field excitation being maintained constant: 520 V

Let’s calculate its voltage regulation for this alternator using the formula given above:

Solution:

• Voltage regulation = (520 – 440)/520 = 0.153
• Percent voltage regulation = 0.1818 * 100 = 15.3%