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Series reactors are installed at strategic locations in a power system so as to
Discharge the capacitor
Neutralizing surges of opposite nature
Directly pass the volt surges to the ground
None of above
None of above
Series reactors are installed in power systems primarily to limit the magnitude of short-circuit currents during a fault. By increasing the series impedance of the line, they keep the fault current within the breaking capacity rating of circuit breakers.
Series reactors are installed in power systems primarily to limit the magnitude of short-circuit currents during a fault. By increasing the series impedance of the line, they keep the fault current within the breaking capacity rating of circuit breakers.
IfтАЛ=ZthтАЛ+jXLтАЛVтАЛ тАФ Fault current limiting expression
XLтАЛ=2╧АfL тАФ Inductive reactance of the reactor
A series reactor is an inductor connected in series with the line. During a normal state, the voltage drop is negligible. During a short-circuit fault, the high rate of change of current di/dt across the reactor induces a back EMF, which significantly reduces the prospective fault current to safe levels.
Used to limit the short-circuit current to values compatible with existing circuit breaker ratings.
They act as current-limiting devices under abnormal conditions (faults).
They are distinct from shunt reactors, which are used for reactive power compensation.
Increases system impedance, which may affect voltage regulation.
Protection of expensive switchgear from high fault levels
Allows use of lower capacity (cheaper) circuit breakers
Causes a voltage drop under normal load conditions
Increases the copper losses (I2R) and inductive drop of the system
Bus-bar sectionalizing
Feeder protection
Generator protection
Option A (Discharge capacitor) is the function of a discharge resistor.
Option B (Neutralizing surges) is the function of surge arresters or lightning rods.
Option C (Pass surges to ground) is the function of a surge diverter or lightning arrester.
D is correct тАФ Series reactors are specifically employed to limit the magnitude of short-circuit currents, not for surge protection or capacitor discharge.
Always differentiate between 'Series Reactors' (current limiters) and 'Shunt Reactors' (voltage control/Ferranti effect mitigation) in competitive exams.