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Why power transmission lines voltage regulation is referenced to the receiving end voltage not the sending end voltage?

It's more logical to divide the difference between the sending and receiving end voltages by the sending voltage since it's held constant, right?

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  • \$\begingroup\$ ...and as demand (at the receiving end) goes up losses on the line increase. \$\endgroup\$ – JIm Dearden Mar 9 '17 at 12:47
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The user at the receiving end of the line want to see a constant as possible voltage. So regulating in respect to the receiving end is the correct thing to do. That way the voltage at the receiving end becomes independent of the line load.

Compare this to a 4 wire power supply where the sense wires (almost no current and therefore no voltage loss) are connected to the end of the supply wires (voltage loss depends on the load). That way the voltage at the user or receiving end can be regulated by the power supply to be constant at the receiving end.

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