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Power Factor Improvement technics
Methods of Power Factor Improvement
There are three main ways to improve power factor:
Capacitor Banks
Synchronous Condensers
Phase Advancers
Capacitor Banks
Improving power factor means reducing the phase difference between voltage and current. Since the majority of loads are of inductive nature, they require some amount of reactive power for them to function.
Capacitor Banks
Improving power factor means reducing the phase difference between voltage and current. Since the majority of loads are of inductive nature, they require some amount of reactive power for them to function.
A capacitor or bank of capacitors installed parallel to the load provides this reactive power. They act as a source of local reactive power, and thus less reactive power flows through the line.Capacitor banks reduce the phase difference between the voltage and current.
Synchronous Condensers
Synchronous condensers are 3 phase synchronous motor with no load attached to its shaft.The synchronous motor has the characteristics of operating under any power factor leading, lagging or unity depending upon the excitation. For inductive loads, a synchronous condenseris connected towards load side and is overexcited.Synchronous condensers make it behave like a capacitor. It draws the lagging current from the supply or supplies the reactive power.
Phase Advancers
This is an AC exciter mainly used to improve the PF of an induction motor.
They are mounted on the shaft of the motor and are connected to the rotor circuit of the motor. It improves the power factor by providing the exciting ampere turns to produce the required flux at the given slip frequency.
Further, if ampere-turns increase, it can be made to operate at leading power factor.
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