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Re: [TCML] first light disaster
bartb wrote:
Hi Marko,
Your MMC configuration is the problem if the data you gave is correct.
Each cap is a 0.5uF at 1500V rating. And you said an 8 x 3 array
(meaning 8 caps per string and 3 strings total)?
Each string is then 0.063uF and when three strings are placed in
parallel, the total cap bank capacitance is 0.188uF and it's rated
only at 12kVp. Not only is the cap bank standoff voltage a whopping
low 12kV, but the cap value is off by one magnitude. Also, the initial
description of your cap failures sound like voltage punch through
which for me further supports an MMC configuration blunder.
If the string was one string of 24 caps, then yes 36kV at .0201uF. But
as soon as you divided up the string into an 8x3 array, you changed
the whole setup for 0.188uF and lowered the string voltage to 12kV.
Take care,
Bart
Yes, BUT.............. I've lost the original note but if I recall
correctly Marko is using a 12 kV, 30 ma transformer which would have a
leakage reactance of the order
of 400 k. The reactance of the 0.188 ufd capacitor would be only about
14 k so can't see much of a resonant rise.
Ed
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