> Hi all,
> I'm working on a DC pulsed 30KV 50A power supply which uses a capacitor
> bank to store the energy required for the 30mS pulse. Currently it has
> 300uF bank of oil filled capacitors made up of 37.5uF caps in parallel.
> This is an old power supply (18 years old) and I don't really have that
> much info on the caps except for working voltage (32KV), max tested voltage
> (45KV) and capacitance( 37.5uF). I have done some measurements on one of
> the caps using a LCR meter at 100Hz and 120Hz and that confirmed the
> capacitance value and gave me some resistance value also of R =120mohms.. I
> also got Z and L, although I'm not sure they are relevant.
>
> I need to increase the capacitor bank to extend the pulse time and this
> obviously raises the issue of if I can just order some HV capacitors with
> similar voltage withstand and the required capacitance and add them in
> parallel. My issue is that I don't have any info on working current, peak
> current withstand and ESR.
>
> looking at the info I have available current can go up to 140A, in some
> conditions, hence I was aiming to get some 300A peak current to have a bit
> of headroom. I can go higher but size and cost may become an issue.
>
> In principle I can't see any issue in adding the new capacitors to the
> existing ones in parallel, they are charged from a common supply and
> discharged via a common busbar, but I keep on having this doubt on
> instantaneous discharging and the effect of different ESR. What do you guys
> think, am I overthinking it? any insights would be appreciated.
> Thank you.
> Best Regards
> Luis
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