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RE: [TCML] New Coil Questions, David and x-ray cable
Hi David,
I am nearing first light of my 14400/7.5kva coil. I have gone so far at to
install standard Federal females at the HV cabinet and at the coil. I really
want to run the x-ray cable in tact for clean, safe, quick connect/
disconnect (power off).
In light of Dr. Resonance's warning of HV voltage rise at 60 hz I have
installed a 18KV lightning utility MOV at the cabinet from HV to ground and
a horn gap across the ASRG gap. Unfortunately, my feeder cable is an
excessive 60ft, so there is a lot of collective capacitance. Have you run a
shielded cable that long? Would you consider parting with a shorter one? You
are running higher power than I am at this point. I want to wind a 22-24"
Sonotube next...that will outgrow my back yard but not my desire for more
power and longer streamers!
Thanks,
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of David Rieben
Sent: Friday, May 29, 2009 6:07 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] New Coil Questions
Hi Tyler,
I think others have already addressed your questions
here but I will just add this little bit about x-ray cable.
High voltage x-ray cables are the lines used to trans-
fer the HVDC and the low filament voltage from the
high voltage transformer supply to the x-ray tube head.
They usually consist of two or three individually insu-
lated (for low voltage) wires (usually around #14 or #
16 braided conductor) in the center. This conductor
bundle is wrapped with a thick layer of rubber insulation,
which is for the high voltage standoff. Around the out-
side of this thick rubber sheathing is usually a wrap of
carbonized semiconductor tape and around the tape is
a metal braided sheating, which is connected to ground.
Finally, around the outside of the metal braiding is a
thin rubber outer protective sleave. Finally, the end
terminations are usually a special male plug end that
fits into the female receptacle ports of the HV transfor-
mer and the x-ray tube heads. Here is a picture of
several rolls of x-ray cable that I recently aquired:
http://www.flickr.com/photos/33464569@N05/3408614009/
David Rieben
----- Original Message -----
From: "Tyler Pauly" <rpggod714@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Wednesday, May 27, 2009 10:20 PM
Subject: Re: [TCML] New Coil Questions
>
> I have more questions on the following two.
>
>> 7) Can I wire an arc welder in series with my outlet leads to current
>> limit? I would think so, but again, it doesn't hurt to ask.
>
> Yes, a 225 amp stick welder with its 240 input leads in
> series with the input leads to the pig can be used as a ballast.
> Many people that go this route simply short the output welding
> leads and use the amp selector switch for input current control.
> However, as Scot has also already mentioned here, most arc
> welders are made as cheaply as can be gotten away with and
> typically have like a 20% duty cycle at their maximum setting.
> I finally ended up making a homemade ballast from the core
> of a defunct x-ray transformer. You would have to make sure
> that your core has sufficient cross sectional area to handle the
> power that you're looking to control, too. Others can comment
> on formulae for this.
>
>
> I've heard of people using a PVC pipe as a form to wind heavy wire around,
> and sticking welding rods inside to form an inductive ballast. This
> sounds somewhat cheap and very easy, but will it work? What could go
> wrong, what should I take into account etc.?
>
>
>
>> 8) My pig only has 1 HV bushing, so should I just split the wiring I
>> attach to it to get 2 leads off of it to make the primary circuit? Sorry
>> for the bad wording, I hope I get my question across.
>
> I also use a "single eared" pig to drive my current big coil with
> out any problems. I isolate the case "return" of the pig as RF
> ground and do not allow it to be attached to mains ground so
> that the nasty RF kickbacks don't end up on the metal
> surfaces of my control panel and bite me. ;^0 "I" use
> that high voltage rated x-ray cable to run the HV from my
> pig to my tank circuit and hook the single output bushing of
> the pig to the inner conductors of the cable and the outer tank
> to the outer braiding of the cable. This cable is basically coaxi-
> al cable on steroids and is generally rated at around 75 kVDC.
>
>
> I'm a little confused on both responses to this question. For your
> answer, where do I get some of this cable? And what is the second object
> I'm connecting the cable to? I'm not very familiar with the lingo used
> with pigs.
> So does this cable have two insulated conductors inside? If I were to use
> normal cable with only one conductor, I would be connecting an end to the
> bushing and the other end to.... what again? =P
>
> Thanks again!
>
> Tyler
>
>
>
>
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