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3 phase 6 pulse rectifier how can i calculate filter capacitor value connected across the load

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3 phase 6 pulse rectifier how can i calculate filter capacitor value connected across the load

without capacitor  Measured by osciloscope at Rectifier output are :Vorms=430.6 V , Vodc=430.5 V ,(load current) Io=12.6kA DC 

Now how to design capacitor filter connected across load to reduce the ripple to 3%.Please give the detail description with suitable theory and calculation

asked Aug 19, 2015 by saurabhj619 (120 points)

1 Answer

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Realize you can't avoid the ripple, but you can make it small enough that you can regulate it out.  The formula for the capacitance is:

C = I t / tΔV

C - is the capacitance in farads,

I -  is the DC load current in amperes,

 ΔV - is the allowable ripple across the load, in volts.

In your case, if you're working with 50Hz mains and you can stand, say, 1 volt of ripple, then

C = 100A × 0.01s / 1V  = 1F

 

For a full explanation try this link:

http://electronics.stackexchange.com/questions/134249/full-wave-rectifier-capacitance-calculation

answered Jul 9, 2016 by gilshultzhome-com (17,730 points)

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