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Inrush Resistor Calculation


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Hello to all,


I am designing a VFD of 10KW rating. I want to know, how to select the inrush resistor.Is there any design method is available.


My capacitor bank is 2200ufd/450V 4 nos ( 2sets of 2 capacitors in series). Input voltage is 3 -phase up to 500V ac.


Right now I am using a 500 ohms/25W resistor, but at higher input voltages, the resistor is getting hot.


Please any body knows the selection criteria of Inrush resistor.



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