Products > Test Equipment

High Current AC Source

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Kean:
ITECH China has the IT7800 which can be paralleled for high current.  Won't be cheap, but it may be cheaper than the other (non DIY) options mentioned.
https://itechate.com/en/product/ac-power-supply/IT7800.html

I have no experience with these large units, but do I have a little ITECH IT7321 Programmable AC PSU on my bench.

Martin72:
For higher current simulations we use a transformer with one additonal winding on the core.
We get nearly 100A this way while only 1A primary current is flowing.
So buying a welding transformer and feed him with a low/medium power source ist the cheapest way to gain the 400A current.

tautech:

--- Quote from: Martin72 on July 09, 2023, 10:20:50 pm ---So buying a welding transformer and feed him with a low/medium power source ist the cheapest way to gain the 400A current.

--- End quote ---
Hmm, my 400A AC 2 phase stick welder cost me just $200.

Duty cycle at full tit is another consideration fan cooled or not.

Stray Electron:

--- Quote from: freeelectrons on July 09, 2023, 07:11:57 pm ---It does not seem like there are many accurate programmable ac current sources available.

--- End quote ---

  Oh yes there are! Pacific Scientific and Elgar just to name two of them.  I don't know how high their current ratings are but they are very accurate voltage and frequency wise and they are programmable.  I THINK you can also couple several Elgar units together to increase their current output and drive all of them from a single control module.  What kind of voltage output do you need?  400 amps is a lot of current and if you need that amount at any significant voltage, it's going to be a hell of a lot of Power!  If you just need a volt or two then you might be able to use an Elgar 251 or one of their 750 Watt models set to say 110 VAC and use that to drive a transformer that will give 400 Amps at 1/2 to 1 volt AC.  I've used the Elgar 251s and some of the PS units and I know that Elgar makes a 750 Watt output model and I think they make larger models but I have no experience with them.

freeelectrons:

--- Quote from: Martin72 on July 09, 2023, 10:20:50 pm ---For higher current simulations we use a transformer with one additonal winding on the core.
We get nearly 100A this way while only 1A primary current is flowing.
So buying a welding transformer and feed him with a low/medium power source ist the cheapest way to gain the 400A current.

--- End quote ---

Any links or recommendations?

We use the secondary of this transformer https://www.tescometering.com/product/loading-transformer/ like an auto transformer to double our current but compliance voltage begins to be a concern.

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