RE: Ballast

• To: tesla-at-pupman-dot-com
• Subject: RE: Ballast
• From: Sulaiman Abdullah <sulaiman-at-lityan-dot-com.my> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Fri, 06 Nov 1998 00:12:28 -0700
• Approved: terryf-at-verinet-dot-com

Mike,
MOT's , NST's , Arc-welders etc. have a magnetic shunt placed between
the primary and secondary magnetic circuits.
This has the effect of making the transformer look like a primary
inductance, a secondary inductance (this is what we match to our primary
capacitor for maximum output power) and a relatively low mutual
inductance.
This means that if the secondary is shorted the primary looks like an
inductor with some series resistance, the effective inductance is set by
the designer for the required maximum short-circuit current.
hope that helps ... Sulaiman

> >  I've heard of people
> >  shorting out the secondary on welders but surely this then presents
> zero
> >  inductive impedance then.  Any thoughts?
> >  Viv Watts UK
> Hi Viv, all,
> I was wondering the same thing about MOT's.   I keep hearing about
> people
> popping breakers when using MOT's with the secondary shorted.  I would
> have
> thought that a resistor, or even some type of reactive load on the
> secondary
> would reflect some impedance back to the primary and prevent drawing
> too much
> current.  I haven't heard of anyone trying this.  Why?  Someone please
> educate
> me.
> Mike
> 
> 

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