RE: [TCML] Terry Filter Gound

["Dex Dexter" <dexterlabs@xxxxxxxxxxx>]

How much peak voltage a normal 15kv,60 mA NST tolerates?
If the spark gap in parallel is set to fire at 18-20 kV the NST is safe without filter?

Dex 

--- Gary.Lau@xxxxxx wrote:

From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Cc:
Subject: RE: [TCML] Terry Filter Gound
Date: Wed, 11 Mar 2009 16:52:40 +0000

It probably comes down to how robust your transformer is, insulation-wise, rather than what power level it generates.  Could also be that a 15kV NST needs protection more than a 4kV NST, as there is less margin in the insulation.  But in more practical terms, I think folks tend to use a filter if they feel their transformer is not something they can afford to loose.  If you've got a shelf full of NST's waiting to be used, you're probably not going to bother with a Terry filter.  MOT's are both low on the voltage scale and relatively plentiful, so unlikely candidates for filter protection, despite being at least 1000W.

A more interesting question would be - at what power level should one use a dedicated RF ground.  But I gave no good advice for that one!  Probably depends on whether you have a house full of critical, expensive medical electronics.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Dex Dexter
> Sent: Wednesday, March 11, 2009 7:02 AM
> To: tesla@xxxxxxxxxx
> Subject: Re: [TCML] Terry Filter Gound
> 
> 
> What power levels requires filter for a spark gap tesla transformer?
> Do all 500-1000 W powered coils require filter?
> 
> Dex

<snip>
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