Which of the following devices can reduce the consequences of the Ferranti effect in a transmission line?

Concept:

Ferranti effect:

• The effect is that the voltage at the receiving end voltage is greater than the sending end voltage. (\(V_r>V_s\)).
• The effect occurs only in medium and long transmission lines in which the loads are lightly loaded or non-load.
• Causes due to the capacitance effect.

How to reduce the Ferranti effect:

• Shunt reactor: By placing the shunt reactor at the receiving end to the capacitance effect caused by the Ferranti effect.
• Synchronous phase modifier: An under-excited synchronous motor is run at a lagging load, which makes the machine absorb the capacitance effect.

Additional Information

Series reactor: They suppress harmonics in the power grid and prevent problems caused by unusual events such as transient overcurrent and overvoltage that are generated by opening and closing of power capacitors.

Shunt capacitor:The shunt capacitor helps balance power transmission issues such as low voltage regulation, poor reliability, and power factors.

Series capacitor:

Series capacitors are used to compensate the inductance of transmission line.