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 =3D120mohms. =
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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