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Registered Member #1911
Joined: Mon Jan 05 2009, 06:30PM
Location: Salem, Oregon, USA
Posts: 165
Well, that's a great find. How much did it cost to dig that out of the pie, if you don't mind my asking?
I think that the Ui rating may be a pulse-rating, which is rare for a capacitor, in my experience, but it would be useful to have. If you didn't notice, it says 'Selfhealing" on the plate, which would contribute to this inference (really a guess).
You could use it for coin-shrinking, I'll bet. The output at 900V would be about 131J. Is it a dual-capacitor, or do you have two of them? I'm not sure that 131J is sufficient for coin-shrinking... You could use it as a demonstration model and shrink cans, for sure. You could make an awesome disk/can launcher.
I'll bet you can think of a few other applications.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Its 3phase PFC capacitor so there are actually three capacitors.
Some models may have internal fuses. I had some time ago 20kVAC 100kVAR PFC cap from distribution station and it died almost instantly in pulse applications. I wouldnt use those caps in rapid discharge related stuff because they will fail quickly.
Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
It is indeed a 3-phase PFC capacitor bank. The kvar figure likely applies to the total kvar across the three phases so each capacitor will be one third of the value you calculated. The Ui figure may be the impulse voltage spec between any of the phases and earth, although I am not familiar with this rating so could be wrong.
If it has been deemed to have reached the end of it's useful life then it may have "self-healed" so many times that it's capacitance could be well down on its rating plate value. I'd measure it with a DVM, or hook it up to your mains line and measure the kVARs that it actually draws!!!
It is likely useless for any sort of pulse duty due to the way the self-healing is implemented. If you try to discharge insane currents out of the capacitor you'll probably just fuse sections of the plate patterning and decrease the capacitance value very quickly. I'm sure this won't stop you trying it a couple of times though!
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93.8 kvar Windmill capacitors
