after a rectifier capacitor can be used for the purpose of filtering,higher the capacitor lower the ripples..?

Question

but what would be the other problems with high value capacitor for filtering
wikipedia says : "a larger capacitor will reduce ripple but will cost more and will create higher peak currents in the transformer secondary and in the supply feeding it. In extreme cases where many rectifiers are loaded onto a power distribution circuit, it may prove difficult for the power distribution authority to maintain a correctly shaped sinusoidal voltage curve."

I COULDN'T UNDERSTAND THIS
PLZ HELP

Answer 1

What they mean that is for AC capacitors used for Power factor correction & Inverter shaping,It should not exceed more than specified.. In DC Circuit Higher capacitor Lower ripple CONCEPT is ok.What is your Rectifier Load accordingly your capacitor selection may vary.You are not mentioned About Rectifier capacity & Load Current & what type of Load? is it Purely Inductive?

Answer 2

I can rephrase it in different words, but what part don't you understand?



Power supplies with large capacitor input filters will create a non-linear load on the AC power system. This can cause distortion in the AC sine wave due to this load.



An ideal resistive load causes a current that is also a sine wave, so the AC power system is equally loaded throughout it's cycle. If there are a large number of cap input filters, they make a load that concentrates all of the current at the peaks of the voltage sine wave. This causes the voltage waveform to clip, or flatten, ie, the sine wave becomes distorted.



This results in the peak voltage being smaller than the theoretical, which is 1.4 x VRMS. This means any capacitor input supply will generate a lower DC voltage than it should.



Hope this helps?



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Answer 3

capacitors are used in DC supply to reduce ripples. In AC they are used to improve the power factor to reduce system current and hence voltage drop. Without sufficient current the capacitor will increase the system voltage due to negative voltage regulation and mutation of wave form has not been reported