Variables
Description
What is this formula?
Voltage regulation measures the percentage change in voltage between no-load and full-load operating conditions.
When to use it
Use this formula when evaluating transformer performance, transmission line behavior, voltage stability, and electrical power quality.
Example
A transformer has:
No-load voltage = 240 V
Full-load voltage = 228 V
Formula:
VR = ((Vnl − Vfl)/Vfl) × 100
Substitution:
VR = ((240 − 228)/228) × 100
Result:
VR = 5.26%
Applications
Transformer testing
Transmission line analysis
Power quality studies
Electrical distribution systems
Voltage stability evaluation
Note
Voltage regulation is a performance indicator rather than a physical law. The value depends on load magnitude, load power factor, conductor impedance, transformer impedance, and system configuration. Lower voltage regulation generally indicates better voltage stability.