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The ratio of receiving end power to the sending end power of a transmission line is
known as the transmission efficiency of the line.
% Transmission Efficiency =(Receiving end power /Sending end power) x 100;
= (VR IR cosfR/ VS
IS
cosfS
) x100;
where VR ,IR and cosfR are the receiving end voltage, current and power factor while VS
, IS
cosfS
are the corresponding values at sending end.
Voltage Regulation :-
The difference in the voltage at the receiving end of a transmission line between the
conditions of no load and full load is called voltage regulation and is expressed as a
percentage of the receiving end voltage.
Mathematically,
% voltage regulation =(VS
–VR)/VR x 100;
%Voltage regulation is also given by= (I R cos fR ± I X sin fR)/ER x100;
+ for lagging pf
– for leading pf;
When the pf is leading, and the term IX sin fR is more than the I R cosfR,
then the voltage
regulation becomes –ve.
gregorymasila answered the question on February 20, 2018 at 16:22
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