[TCML] Are safety gaps necessary? TerryFilter MOVs
Gary.Lau at hp.com
Fri Jun 20 19:02:06 MDT 2008
Please explain why you use 9 MOV's per side with a 12KV NST? The recommended configuration for a 12kV NST is 7 per side. Using more than the recommended number is like setting the safety gap too wide; the clamping voltage will be higher than what is safe for the NST. Or does the use of chokes somehow alter MOV behavior? ;-)
That you had no NST failures does not mean that the filter is properly designed. It means only that you didn't open up the main gap too wide.
> -----Original Message-----
> From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On
> Behalf Of DC Cox
> Sent: Friday, June 20, 2008 8:30 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Are safety gaps necessary? TerryFilter MOVs
> I use 9 MOVs in each leg with 12/60s. No nst failures, but I also use air
> core chokes on the other end of the filter.
> Dr. Resonance
> On Fri, Jun 20, 2008 at 10:40 AM, b alex pettit jr <a_pettit_jr at yahoo.com>
> > On a related topic,
> > How may MOVs are required for safe operation in the
> > Terry Filter ?
> > I have 8 per leg for the 12KV/60ma - just used the
> > full set of MOVs provided in the kit, maybe too many ?
> > Since they are rated at 1800v, 6000/1800 = 3.33
> > per side, but seems as if most use many more than that ... ??
> > Whats the consensus ?
> > Thanks,
> > Alex P
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