(A) compensate for line inductive reactance and improve the stability of the power system
(B) improve the voltage
(C) reduce the fault level
(D) improve the power factor
Answer: (A) compensate for line inductive reactance and improve the stability of the power system
Explanation:
Series capacitors are used to compensate the inductance of transmission line. They will increase the transmission capacity and the stability of the line. These are also used to share the load between parallel lines.
Whenever an inductive load is connected to the transmission line, power factor lags because of lagging load current. To compensate this, a shunt capacitor is connected which draws current leading the source voltage. The power factor can be improved.
Series reactors are used as current limiting reactors to increase the impedance of a system. They are also used to limit the starting currents of synchronous electric motors and to compensate reactive power in order to improve the transmission capacity of power lines.
A shunt reactor is an absorber of reactive power, thus increasing the energy efficiency of the system.
Series Compensation is basically putting EHV capacitors in series with transmission lines. The capacitor compensate the inductive reactance of transmission line, thereby making virtual reduction in line length and enhances the stability limit and power transfer capacity.
The main purpose of series compensation in power systems is to decrease the reactive impedance of the transmission line to reduce voltage drop over long distances and to reduce the Ferranti effect.
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