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reduce harmonics

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#1 Lewis


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Posted 04 October 2002 - 01:12 PM


If I switch a capacitor bank to correct the power factor, there will be a inrush current in the system. How to solve it?
Besides, how to reduce the harmonics at the same time?
Thank you.;d;

#2 marke


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Posted 04 October 2002 - 09:11 PM

Hello Lewis

Yes, when you switch in the capacitors, there is a high inrush current. The magnitude can be reduced by the addition of inductance in series, or using solid state switches to switch at the zero crossings.

Harmnic currents flowing in the capacitors cxan be reduced by the addition of detunig inductors in series with the capacitors. Typically, the inductors are selected to provide a tuned circuit with the capacitors at about 189 Hz. To the fifth harmonic and higher, the circuit will look inductive and so the harmonic currents will reduce.

Best regards,

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