Re: MMC cap bank

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dr. Resonance by way of Terry Fritz <teslalist-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Corona losses at the plates edge also consume a fair amount of power.  These
corona losses also produce heat losses beyond the traditional I square R
losses.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
 >
 > Suppose we have 10 amps RMS at 100 BPS and our caps are 0.05 ohm of
 > internal resistance (typecal for a 15/60).  From P=I^2R the power lost as
 > heat in the caps is 5 watts.  Now lets hook it to a pole transformer and
 > run it at 1000 BPS for 100 amps RMS:
 >
 > P = I^2 x R  == 100^2 x 0.05 = 500 watts.
 >
 >   The array can run all day at 5 watts.  But 500 watts it will die
 > fast!!  Probably like 15 seconds.
 >
 > Cheers,
 >
 >          Terry
 >
 > At 09:07 PM 7/3/2003 -0700, you wrote:
 >
 > > > Second, keep the BPS rate LOW.  Capacitor current is
 > > > directionally
 > > > proportional to BPS.  3000 BPS has 10X the current
 > > > of 300 BPS and 100X the
 > > > cap heating!!!
 > >
 > >Hi Terry,
 > >
 > >I "think" the heating should only be 10x as much. If
 > >it were 100x then each burst would have to waste 10x
 > >the power, and I don't see how that is possible. The
 > >average current will be 10x as much, but the RMS will
 > >only be SQRT10x as much because the duty cycle is
 > >greater. Check me on this because it's getting late
 > >for me ;-)).
 > >
 > >=====
 > >Jimmy
 >
 >