Correct option is B
Shunt reactors are used to bring down receiving end voltage at light loads. They are used in high voltage transmission systems to control voltage during load variations.
Explanation:
· At light loads, medium and long transmission lines can operate at a leading power factor. This is due to the capacitance effect.
· When this happens, the receiving end voltage can become greater than the sending end voltage.
· Shunt reactors are used to compensate for the surplus reactive power generation that can occur during light loads.
· Shunt reactors are switched on or off to provide reactive power compensation.
