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Registered Member #1180
Joined: Mon Dec 17 2007, 12:26AM
Location: Nope
Posts: 28
so I want to make a higher powered TC, but I don't have a higher voltage source than 10 Kv, so instead of making a multiplier circuit and losing out on current, could I link some transformers together in a series, or will it do something horrible to them and/or cook them.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
It depends on the transformer you intend on using. 10kV is a workable voltage, you probably want to keep it at that and just increase the current. If you are using an NST, then you can do this by running another NST in parallel, running them in series is not recommended as it would exceed the secondaries voltage winding limit causing internal arcing and a dead xformer. Higher tank voltages means increased problems for insulation, higher cap voltage value, etc.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
You want to shoot for between 10kV and 15kV ideally. Less than that, especially at higher power, you get too much current in the spark gap leaving problems of its own. To high voltage, then you have to start worrying about corona and all the effects.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
like goldsphere said it'd be best working with voltage you have.pole transformers are the highest amount of power coilers typically use and they put out 6000 to 14000 volts.what you have is easier to work with than 20kv.also it will either kill one of the transformers or over time the corona will eat away at the insulation and the tar and then kill them.also it is hard to get a capacitor good for that voltage at reasonable capacitance.just hook them in parallel for higher current.also after that double the capacitance.if you must use higher voltage instead of current just hook the is series.but you WILL kill one of the transformers sooner that there lifetime would be with 10kv...
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
As I said, you can run another 10kV transformer in parallel. This will give you a new impedance value on the secondary side, therefore you are able to increase your cap size relatively. If you use two 10kV transformers with same rating (suggested), then you just double the cap size. What is your 10kV transformer rating?
Registered Member #341
Joined: Thu Mar 23 2006, 07:41PM
Location: Northern Illinois, USA
Posts: 69
thermite,
It depends on how you acquire your pig. If your procurement process involved a chainsaw and bolt cutters then it was probably illegal, if you purchased it from the lawful owner then no problem.
PCB's haven't been used in transformer oil in forever. My pig has a label on its side stating "NO PCBs".
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
PCB is toxic but in a very special way. Direct skin contact, even swallowing of lower amounts is not such a problem. The danger of PCB is in accumulation in fatty tissues along the food chain. It means that PCB leaked into the environment is firstly absorbed by small animals (plankton). Than eaten by fish (it get 10times more concentrated in that fish) than with a bigger fish (100times more than in the plankton) and than by human (or bird or whatever animal) eats this fish and gets toxic dose. That's why it took so long to find out the toxicity of PCB. Even as if you get a transformer filled by PCB in these days and it would for whatever reason leaked - yes it is not good but it is not disaster. It is similar like with freons in the old cooling systems - the mass production was the problem, not small local leakage.
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voltage multiplication
