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Re: Bleeders for a cap bank



Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

time constant...RC =  .068E-6 * 10E6 = 0.68 seconds
Voltage drops to exp(-1) (approx 0.37) in one time constant.
Voltage drops to Vinitial*exp(-t/RC) for abitrary time.
Assume 1000 V across the cap.. after 0.68 seconds, voltage is 370V. After 2
RC, 1.36 seconds, 135 V, after 3TC (2.04 seconds), about 50V, etc.   after
10 seconds...(14.7 RC), 0.4 millivolts...

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, July 07, 2001 9:27 AM
Subject: Bleeders for a cap bank


> Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jasonp-at-btinternet-dot-com>
>
> Hi all
>
> I have a pretty standard MMC setup with 10meg bleeders across each cap -
> what kind of time do the resistros take to bleed the caps? This is my
> logic...
>
> 1 farad=96000 coulombs
> 0.068uF = 0.000068F
> 0.000068*96000 = 6.528C
>
> at 714.3V per cap, and I=V/R, 714.3/10,000,000 = 0.00007143A thru each
> resistor.
>
> so, since Q=IT and therefore T=Q/I then T=6.528/0.00007143 = 80 thousand
> seconds.
>
> which is obviously wrong.... so how long do the resistors take to bleed
the
> caps?
>
> Thanks,
> Jason
>
> Geek # 1139 Rank G-1
> www.thegeekgroup-dot-org
>
>
>
>