[TCML] Terry Filter for a pig?

["Lau, Gary" <Gary.Lau@xxxxxx>]

Changing the subject line...

Terry filters are usually used for NST's with mid-point grounded secondary coils, and this is why there are basically two of everything - one filter for each side.  But with a pole pig, wouldn't you tie one of the HV bushings to RF ground?  I'm not sure why there needs to be two complete filters (as shown in the photo link) as with NST's.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of bartb
> Sent: Tuesday, August 26, 2008 8:25 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Terry Filter Caps
>
> Hi Phil,
>
> Yes, I thought Adam has sent the post (had two lines of "so and so
> wrote:" and for some reason thought it was Adam).
>
> Anyway, wow, a Terry filter fitted for a pig!
> http://members.aol.com/fiftyguy/TC_Pig_Terry_Filter.jpg
>
> I especially like the horn gap approach and even the sphere's on the
> ears! It certainly doesn't hurt to provide a little transformer filtering.
>
> Take care,
> Bart
>
> FIFTYGUY@xxxxxxx wrote:
> > Yeah, and the MOV's are slow to respond to  transients at 1 MHz. But they
> > certainly are nice to have!
> >     Some distribution arrestors use "combined  technology" with a spark gap
> > in series with the MOV element, just to complicate  things. I think the big one
> > I've got sitting around is like that, since the last  time I tried it across
> > my pig on an untuned coil, hot metal sparks actually shot  out of it and
> > rolled on the ground.... The two arrestors on my pig have done  just fine at
> > 15+kVA, even when the safety gap has been firing. I feel I've got  that safety gap
> > set pretty tight, but my arrestors are as tight on the MCOV  specs as I dare go
> > (even tighter than the specs for the "usual NST" Terry  Filter).
> >
> > -Phil LaBudde
> > Center for the Advanced Study of Ballistic  Improbabilities

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