Ferranti Effect:
In a medium or long transmission line when open circuited or lightly loaded the receiving-end voltage is found more than the sending end voltage. This is called the Ferranti effect.
This effect is due to voltage drop across the line inductance, due to charging current, being in phase with the applied voltage at sending end of the line. Thus both capacitance and inductance are necessary to cause this phenomenon. The capacitance, and therefore, charging current is negligible in short transmission lines. On a 300 Km line operating on 50 Hz supply, the receiving end voltage on open circuit is usually found to be roughly 5% higher than the sending-end voltage.
So,
The phenomenon of rise in voltage at the receiving end of the open- circuited or lightly loaded line is called the Ferranti effect
Phasor diagram of Ferranti effect
Hence the rise in voltage at the receiving end side.
In a medium or long transmission line when open circuited or lightly loaded the receiving-end voltage is found more than the sending end voltage. This is called the Ferranti effect.
This effect is due to voltage drop across the line inductance, due to charging current, being in phase with the applied voltage at sending end of the line. Thus both capacitance and inductance are necessary to cause this phenomenon. The capacitance, and therefore, charging current is negligible in short transmission lines. On a 300 Km line operating on 50 Hz supply, the receiving end voltage on open circuit is usually found to be roughly 5% higher than the sending-end voltage.
So,
The phenomenon of rise in voltage at the receiving end of the open- circuited or lightly loaded line is called the Ferranti effect
Phasor diagram of Ferranti effect
Hence the rise in voltage at the receiving end side.
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