The percentage voltage regulation of transmission lines is computed as:

(Where s is the sending end; R, receiving end; NL, no-load; FL, full-load)

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Concept:

Voltage regulation of Transmission line:

  • When a transmission line is carrying a current, there is a voltage drop in the line due to the resistance and inductance of the transmission line.
  • Finally, the receiving end voltage ( V) of the line is generally less than the sending end voltage (VS)
  • The difference in voltage at the receiving end of the transmission line between the conditions of no-load and the full load is called voltage regulation
  • Voltage regulation is expressed as a percentage of the receiving end voltage.


 

Note: At no load, 

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