Methods to improve the power factor of an inductive load circuit include: connecting capacitors of appropriate size in parallel at both ends of the inductive load. Because the voltage on the inductor leads and the voltage on the capacitor lags behind; for an alternating current of a certain frequency, a parallel circuit of inductors and capacitors with matching sizes can be equivalent to a pure resistance circuit, and the power factor is improved.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
The appropriate method to improve the power factor of the inductive load circuit is ().
A． Connect a capacitor of appropriate size in series with the inductive load
B. Connect a capacitor of appropriate size in parallel to both ends of the inductive load
C. Connect a resistor of appropriate size in parallel to both ends of the inductive load
D. Connect a resistor of appropriate size in series with the inductive load
Answer: B.
Analysis:
Because the voltage on the inductor leads and the voltage on the capacitor lags. For alternating current of a certain frequency, a parallel circuit of inductors and capacitors with matching sizes can be equivalent to a pure resistance circuit, and the power factor is improved.
The purpose of increasing the number of power factors is to reduce the loop current of the power supply, that is, the reactive current, because the greater the current, the greater the voltage drop formed on the wire and the greater the loss.
Extended information:
Related principles
Using the parallel resonance of capacitor and inductor, the capacitor can offset the Part of the inductive currents, that is, those reactive currents, only form a loop in the parallel resonance of the inductor and capacitor.
No longer forms a loop with the power supply, thereby reducing a part of the reactive current in the power supply loop, and only the active current in the power supply loop is left, that is, the current of the load, which is a pure resistance current , because the power factor of a purely resistive circuit is the largest.
No longer forms a loop with the power supply, thereby reducing a part of the reactive current in the power supply loop, and only the active current in the power supply loop is left, that is, the current of the load, which is a pure resistance current , because the power factor of a pure resistive circuit is the largest
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