Re: [TCML] Re. safety gap.

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I guess I should have mentioned my arrester, as it's a combination MOV and spark 
gap. My 18 kV is still hanging in there, which is a pleasant surprise as I feed 
my pig 280 volts.



----- Original Message ----
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, April 4, 2011 2:23:36 PM
Subject: Re: [TCML] Re. safety gap.

Hi Adam, all,


Yes, I use an ARSG with my piggy powered SG Tesla coil system
but no, I do NOT use any stationary safety "gap", as I've found that
if it ever does "fire" with that kind of power behind it, it simply goes
straight to a power arc and will not extinguish unless I turn the variac
all the back down to near zero.  I DO instead use a 27 kV rated
distribution "lightning" arrester in parallele with the output bushings
of my 14.4 kV pig for at least some bit of protection. I've tried 18 kV
rated ones but eventually ended up smoking them, twice. No more
problems with this after the upgrade to 27 kV.

David Rieben


----- Original Message ----- 
From: "Yurtle Turtle" <yurtle_t@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, April 04, 2011 11:00 AM
Subject: Re: [TCML] Re. safety gap.


I currently use a static sucker gap, so i see no need to add a redundant
parallel gap. When I was using a ARSG, I did have a safety.



----- Original Message ----
From: DC Cox <resonance@xxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Mon, April 4, 2011 11:13:12 AM
Subject: Re: [TCML] Re. safety gap.

A single spark gap is all that is required, and yes ---- you should use a
protective filter. RF "spider webs") across a HV xmfrs sec coil with no
protection ---- no matter what type it may be.

A lot of people don't do this but they are certainly not following good
engineering practice.

Dr. Resonance





On Mon, Apr 4, 2011 at 3:00 AM, Yurtle Turtle <yurtle_t@xxxxxxxxx> wrote:

> I have a two terminal 14.4kV 25kVA pig. I ground one terminal, so this
> wouldn't
> work in my case. In fact, I don't use a safety at all on my pig.
>
> When I used NSTs, up to a single 15kV 120ma beast, I always used three
> terminal
> safety gaps.
>
>
>
> ----- Original Message ----
> From: Phil Tuck <phil@xxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Sun, April 3, 2011 9:22:41 AM
> Subject: RE: [TCML] Re. safety gap.
>
> I had never considered putting a three ball with an earthed-centre safety
> gap on
> a pig, as I just use a two-horn arrangement on mine. With the winding
> arrangement of an NST however, it makes obvious sense.
>
> Having said that, on a pig it would no doubt help in dealing with a 
> primary
> strike, as it offers a path straight to the RF earth, rather than going
> through
> the pig's windings to the core or case and then earth.
>
> As for over-voltage peaks if your pig has a normal two terminal type 
> output
> (no
> connection to the case), any peaks would still be caught because they 
> would
> just
> go from one ball to the centre and mostly onto the third. Therefore, the
> centre
> earth would matter less in that case.
>
> Be interesting to hear what others think, the archives on this matter all
> relate
> to NST's it seems.
>
> Regards
> Phil
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> Of
> Phillip Strauss
> Sent: 01 April 2011 13:44
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Re. safety gap.
>
>
> Hello all,
> Could anybody inform me on the relative merits of a two ball safety gap as
> opposed to one with a third central earthed ( to RF ground) ball to be
> fitted
> across my SRSG.
> Many thanks.
> Phillip.
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