Re: Capacitor formula

• To: tesla-at-pupman-dot-com
• Subject: Re: Capacitor formula
• From: Jim Lux <James.P.Lux-at-jpl.nasa.gov> (by way of terryf-at-verinet-dot-com)
• Date: Wed, 26 Aug 1998 18:59:30 -0600
• Approved: terryf-at-verinet-dot-com

X-Envelope-From: James.P.Lux-at-jpl.nasa.gov  Wed Aug 26 12:35:30 1998

Tesla List wrote:
> 
> KVAR is KVA Reactive, that is the capacitive power at the working voltage,
> so it would draw 39100/14400 amps, or about 2.7 amps at 14400V.  That would
> give it 5300 ohms of capacitive reactance, or about .5 uF.  The formula does
> it all in one step, and is normalized to kV, and uF.  Dont recall what the
> 95 KVBIL means.
> 

BIL = Basic Impulse Insulation Level  It is the withstand voltage for a
simulated lightning type impulse 1.2 uSec rise time(10% to 90%)/50 uSec
fall time (100% to 50%).   What the 95 kV rating means is that the unit
can take that much voltage without flashing over to ground.  95 kV is a
typical rating for outdoor components on medium voltage (e.g. 14 kV)
feeders.

You'll also see BSL, which refers to switching impulses, 250 uSec rise/
2.5 mSec fall.

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