Download Chapter 3 VOLTAGE CONTROL

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Transcript
For most of power circuit, resistance R will be much less as compared to
reactance X. Neglecting the resistance of the transmission line, we get
Voltage drop ΔV =
XQ
V2
(33)
From eq. (33), we can state that the voltage drop in the transmission line is
directly proportional to the reactive power flow (Q-flow) in the transmission line.
Most of the electric load is inductive in nature. In a day, during the peak hours, Qflow will be heavy, resulting more voltage drop. However, during off-peak hours,
the load will be very small and the distributed shunt capacitances throughout the
transmission line become predominant making the receiving-end voltage greater
than the sending-end voltage (Ferranti effect). Thus during off-peak hours there
may be voltage rise in the transmission line from sending-end to receiving-end.
Thus the sending end will experience large voltage drop during peak load
condition and even voltage rise during off-peak load condition.