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Re: [TCML] New Coil Questions
Hey Tyler...
answers are after each question...
Tyler Pauly wrote:
Hello all,
I've been out of the tesla coil "circuit" for a while now but I'm looking to get back in. I've had a 10kVA pig sitting in my garage for a while and I want to put it to use. Some questions....
1) Would it be okay to go over rating on the pig? I assumed as much, but figured it wouldn't hurt to ask. I'm thinking somewhere in the range of 12-13kVA if I do.
Running 20% above the nameplate is acceptable for 3-5 min runs with a 10-20 min cool down period
2) Is the most straightforward route for the tank capacitor an MMC, or are there other (easy-to-find) capacitors that would work as well?
Building an MMC for a piggie (10+kva) is going to require LOTS of caps... see if someone on the list has some Maxwells or big caps up for sale!!
3) I have an equation that tells me the capacitive reactance of my xmfr. Do I want my tank capacitor to have that value, or would the resonant effects be a bad thing? What value should I shoot for?
Running at resonate values is dicey even with piggies... if you can go
for larger than resonate values, if not go for smaller ( I run .01uF at
250KV on my 10KVa setup)
4) Where have most of you guys gotten your variacs? Talking about the 0-280V 28A ones. I can't seem to find any, and I would like 2. I assume they'll be expensive once I find them...
I got all of mine(4) from Ebay, they averaged out to 100$ each but
shipping was expensive, IIRC all 4 cost total of 900$.
5) Are the CDE 942 caps still the best choice in MMC building? Who are some suppliers? I can only find/think of Digikey.
Dont know this answer...
6) I know the coil's secondary will be into the 3:1 realm, but how big should it be? I'm mainly asking for 12kVA usage with the pig, as that's what I hope to run it with.
For a 10 KVA I would go 12"dia with #18 wire for 50 - 58" length of windings
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 but make sure the welder is capable of handling 60+ amps on the primary side of the welders transformer and be careful of the "Duty Cycle" of the welder at full capacity. The duty cycle will limit your run times of the coil
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 really dont think that will work, I believe you need to use the case/ground as the "neutral" leg of the output,,, but dont take my word on this setup, wait and see what the other guys have to say ( I feel that I may be totally wrong on this answer since I use dual bushing piggies on my coil)..
Thank you for bearing with me, if you got through all that. And thanks again if you answer any of them! :P
Tyler
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