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Re: [TCML] NST and HV Cables



Phil,Binny,

Just a word of warning, don't trust the face plate voltage on NST's . They usually quote the RMS voltage at their designed output current. Of course using them in TC duty they are not running into a constant load so It is likely that you will have more than the rated voltage. Also you need to take into account the peak voltage (not RMS) as this will be 1.4 time higher as this is the voltage that your primary cap will charge to (assuming the spark gap hasn't fired).

As an example my 10KV (plate rated) NST will charge a cap to around 20KV off load. Rate your primary Cap and cables accordingly..

    Derek

On 20/10/2011 16:51, Phil Tuck wrote:
David,
Every time I wrote FART I smiled myself. It is the [unfortunate] name of the
Italien company that produces them. I wasn't sure if fart meant the same in
the USA - obviously it does.

http://www.fart-neon.com/


Phil


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of drieben
Sent: 20 October 2011 16:42
To: Tesla Coil Mailing List
Subject: Re: [TCML] NST and HV Cables

Hi Phil, all,

I must have missed some part of this conversation but could someone please
tell me what a "FART" is? I didn't know there were NSTs of the flatulent
variety. ;^)

David Rieben


----- Original Message -----
From: "Phillip Strauss"<pstrauss1947@xxxxxxxxx>
To: "Tesla Coil Mailing List"<tesla@xxxxxxxxxx>
Sent: Thursday, October 20, 2011 9:06 AM
Subject: Re: [TCML] NST and HV Cables



Hi,
I have used a 10Kv 100mA Fart with it's GFI disabled  and protected with a
Terry filter to great effect. A word of warning, I destroyed an earlier
identical (new) transformer by flicking it on and off at max voltage across
a spark gap with nothing else connected so beware back EMF effects.



________________________________
  From:  Phil Tuck<phil@xxxxxxxxxxx>;
To:  'Tesla Coil Mailing List'<tesla@xxxxxxxxxx>;
Subject:  RE: [TCML] NST and HV Cables
Sent:  Thu, Oct 20, 2011 7:25:37 AM


Binny wrote "curious how you came up with the 10KV value. Looking at the
nameplate under KV I see 3,75-3,75 and that leads me to believe it is a
7,500 volt 60 MA output not 10/60. "

Bimmy: Pour yourself a drink, sit down and relax, and re-read my post again,

Rixong: Yes it appears to be a heavy iron type even though it looks like a
new type electronic one. The trouble though is that the sensors for earth
leakage and open-circuit protection will cause problems. Now, if you can
actually disconnect them it would be ok, but a lot that look like that have
the parts buried inside the resin, the FART one you have fortunately didn't.

Later resin filled ones without the protection circuitry, could be better in
some respects, as a modern resin would be better than old fashioned tar of
course, which may have voids in it. Tar is also
  probably a worse insulator
than modern resin.
I used four 10Kv FARTS the same as yours in parallel for quite a while
before getting a pig.

Phil


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Binny
Sent: 19 October 2011 18:23
To: Tesla Coil Mailing List
Subject: Re: [TCML] NST and HV Cables

Hello Phil and group,
Say Phil, just curious how you came up
with the 10KV value. Looking at the nameplate under KV I see 3,75-3,75 and
that leads me to believe it is a 7,500 volt 60 MA output not 10/60. From
what I have read it will work,not the best and hard on the spark
  gap but it
is doable. I wonder tho ,if a voltage doubler would work in this
circumstance. I have at least one 750/120 and wanted a simpler demo version
so I put it on the back burner so to speak. A set up like that might be an
interesting coil project.   ...Happy coling to all...Binny----- Original
Message -----
From: "Phil Tuck"<phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'"<tesla@xxxxxxxxxx>
Sent: Wednesday, October 19, 2011 11:49 AM
Subject: RE: [TCML] NST and HV Cables


Yes and Yes.

A lot of resin NST's can't be used, but I have used that same NST
successfully. The GFI thing on those is external and screws across
three of the terminals on the top, but yours is missing. The lid
normally has two metal links that
  engage with the springs you can see,
the idea being you pull the lid off and the HV is then off. It's a bit
low on output volts as 10Kv would be better (10Kv is the max in Europe
I think, while America has 15Kv ones)

Careful when you wire it up as the HV outputs are at the top part in
the picture.


Phil


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Rixong
Sent: 19 October 2011 16:22
To: tesla@xxxxxxxxxx
Subject: [TCML] NST and HV Cables

Hello! We are three young students from Sweden about to do a project
that involves the
  construction of a tesla coil. Since we are all
beginners when it comes to constructing tesla coils we will post a lot
of basic questions which we don't think will be a problem for you guys to
answere.
So, here is our first question. Will this neon sign transformer work
as a power supply for a tesla coil?

http://i52.tinypic.com/20u7bb5.jpg
http://i52.tinypic.com/103ewr8.jpg

Second question. Are these high voltage cables suitable for a tesla coil?

http://i55.tinypic.com/9gy4pv.jpg
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