RE: [TCML] Terry Filter MOV heat

[Mark <mark@xxxxxxxxxxxxxxxx>]

Thanks from all the response's guys, turns out I made a mistake original
I had 2 x 5Kv transformers so built the filter using 7 MOV's, I then
obtained a 15Kv transformer and never thought to check the filter could
handle it, so it looks like I fried the MOV's..

Sometimes the answer is just staring you in the face, I had been trying
to figure why for a evening and never though to check the original
design spec, so many thanks.

Mark 


On Thu, 2008-06-19 at 19:27 +0000, Lau, Gary wrote:
> The correct number of MOV's to use is governed by the NST voltage.  For a 15kV NST, 8 per side are needed.  With what voltage are you using 7?  Who is using 5?
> 
> Per Terry's original documentation:
> NST     MOV's per side
> 9kV     6
> 12kV    7
> 15kV    8
> 
> Regards, Gary Lau
> MA, USA
> 
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of DC Cox
> > Sent: Thursday, June 19, 2008 12:02 PM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] Terry Filter MOV heat
> >
> > Yes, but it's not good.  I alwys use 7 MOVs in each leg, not 5.  This seems
> > to work and they don't run so hot.  Be sure to use the safety gap of course.
> >
> > Dr. Resonance
> >
> >
> >
> >
> > On Thu, Jun 19, 2008 at 8:55 AM, Mark <mark@xxxxxxxxxxxxxxxx> wrote:
> >
> > > Hi,
> > >
> > > Quick question for someone I hope, I've just finished building my Terry
> > > Filter and when setting the safety gap noticed the MOV's nearest the
> > > ground rail get very hot, so hot you can't touch them, is this
> > > normal ???
> > >
> > > Regards
> > >
> > > Mark
> > >
> > > _______________________________________________
> > > Tesla mailing list
> > > Tesla@xxxxxxxxxxxxxx
> > > http://www.pupman.com/mailman/listinfo/tesla
> > >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
> 

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla