Electrical power transmission lines possess series resistance, inductance, and shunt capacitance. The resistance and inductance of a transmission line cause a voltage drop across it. As a result of this drop, the voltage at the receiving end is smaller as compared to the voltage at sending side.
The term voltage regulation of transmission line is an expression of the difference between sending and receiving voltage. Voltage regulation abbreviated as V.R is specified as a percentage of VR.
The mathematical formula expression for VR is:
Where in above equation:
- VS = Sending end voltage
- VR = Receiving end voltage
Good to know
The good voltage regulation is the low voltage regulation, which implies, the increase in load current will have a minimum effect at receiving end voltage.