What is voltage regulation in a transmission line?
Voltage regulation of transmission line is defined as the ratio of difference between sending and receiving end voltage to receiving end voltage of a transmission line between conditions of no load and full load.
When the regulation is positive then receiving end voltage compared the sending end voltage is?
Where Vs is the sending end voltage per phase and VR is the receiving end voltage per phase. For VS > VR, then voltage regulation is positive. For VR > VS, then voltage regulation is negative.
What is the significance of voltage regulation?
Voltage regulation is the measure of how well a power transformer can maintain constant secondary voltage given a constant primary voltage and wide variance in load current. The lower the percentage (closer to zero), the more stable the secondary voltage and the better the regulation it will provide.
Why receiving end voltage is less than sending end voltage?
Receiving-end voltage as a function of the line current in the case of and . At A, the magnitude of the voltage becomes the same as that of the sending-end voltage . When the line current increases to more than 366 A, the receiving-end voltage becomes less than the sending-end voltage.
What happen if voltage regulation is high?
In other words, regulation determines the variation in secondary terminal voltage which occurs inside the transformer as a result of variations in the transformers connected load thereby affecting its performance and efficiency if these losses are high and the secondary voltage becomes too low.
How is voltage regulation defined in a transmission line?
% Voltage Regulation = [ (Vs – VR) x100/ VR ] % Thus Voltage Regulation can be defined as, “the drop in receiving end voltage from no load to full load expressed as percentage of Receiving end voltage.” For a transmission line, it is expected that receiving end and sending end voltage are same.
When does the voltage drop in a transmission line?
When transmission line is carrying current, there is a voltage drop across the impedance of the line. Due to this voltage drop, normally receiving end voltage is less than the sending end voltage. There is one exception where receiving end voltage is more than the sending end voltage. That exception is Ferranti Effect.
How is the current of a transmission line related to the power factor?
Now it is clear that to transmit given amount of power, the load current is inversely proportional to receiving end power factor. Here it is clear that transmission efficiency depends on the receiving end power factor. In this method capacitance is assumed to be lumped at receiving end. One phase is shown below.
What is the voltage at the receiving end?
VR = Receiving end voltage Is = IR = Current through the line Z = Line impedance = R+jX When transmission line is carrying current, there is a voltage drop across the impedance of the line.