Voltage Regulation: When the transmission line is energized, the current is flowing in the line. Due to this current, a voltage drop occurs because of the resistance and inductance of the line. So, the receiving-end voltage (VR) is always less than the sending-end voltage (Vs).
The difference produced in the voltage at the receiving end of the transmission line from no load to full load conditions is known as voltage regulation of the line and it is expressed as a percentage of the receiving-end voltage (VR).
It is always desirable that the voltage regulation of the line should be low, or in other words, the increase in the load current should lead to a small difference in the receiving-end voltage.
EXAMIANS
