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Registered Member #2325
Joined: Sat Aug 29 2009, 10:08PM
Location: Southern California
Posts: 11
Ugh, my whole resonant microwave oven capacitor bank died today. I was stupid enough to push it to 24kV, (10 MOT stack) with only five strings of three capacitors in series-parallel. The whole bank just turned into fire crackers. :/ Is there any decent retail market that sells cheap high voltage capacitors that can take this kind of voltage/current? Preferably at a low cost. I'm thinking of just ditching the idea of microwave capacitors, as they seem to not work that well for this application. (As if they were ever designed for it!) Thanks!
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I'd say you wont find a cheaper and better solution than microwave caps. Just follow the rule- a cap in series for each series MOT. It is also a good idea to not just connect the seriesed cap strings in parallel, but also interconnect the "equal potential" points between caps.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Dr. Kilovolt wrote ...
I'd say you wont find a cheaper and better solution than microwave caps. Just follow the rule- a cap in series for each series MOT. It is also a good idea to not just connect the seriesed cap strings in parallel, but also interconnect the "equal potential" points between caps.
I have sort of wondered about that. I guess the point of that is to keep the voltage as equalized as possible?
Registered Member #191
Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
Dr. Kilovolt wrote ...
I'd say you wont find a cheaper and better solution than microwave caps. Just follow the rule- a cap in series for each series MOT. It is also a good idea to not just connect the seriesed cap strings in parallel, but also interconnect the "equal potential" points between caps.
I thought it was a bad idea to interconnect the seriesed strings. Reason behind is that in the event of a puncture, the whole paralleled row discharging into a puncture, destroying the cap instead of letting it self-heal. And afterwards, the node will see much higher voltage due to reduced capacitance... somewhat of a runaway situation.
Registered Member #2325
Joined: Sat Aug 29 2009, 10:08PM
Location: Southern California
Posts: 11
Dr. Kilovolt wrote ...
I'd say you wont find a cheaper and better solution than microwave caps. Just follow the rule- a cap in series for each series MOT. It is also a good idea to not just connect the seriesed cap strings in parallel, but also interconnect the "equal potential" points between caps.
That was my mistake. I had done that before - but I figured it would cause more harm having the series'ed strings connected together (flash overs across the terminals/wires). Now to find a place that sells bulk microwave capacitors.
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Cheap Capacitors for MOT Resonance
