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Old 12th August 2007, 11:30 AM   #1
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Default Help needed: Mains stabilization from 3-phase

This is my first thread in diyaudio, so greetings to everybody from a newcomer.

It was a while ago when I saw something somewhere about an idea to use 3-phase supply as input to get 1-phase stabilized output to feed audio equipment. It was said to have some advantages over traditional 1-phase-in-1-phase out solution.

Now I am trying to find this information in the net, but somehow it seems to be avoiding me. Or perhaps I was dreaming? Or maybe ?

Could anyone tell that either there is such a thing (and where I can find some information including schematics), or I should see a doctor

Many thanks for attention!
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Old 15th August 2007, 03:24 PM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
I cannot see why there should be an advantage to using two of the three phases or all three phases to generate a single phase output.
Transformers from 400Vac to normal output voltages are available that work off two phases but these are not normally brought into the home.
You usually only see then inside equipment that is already three phase.

How would you connect safely to a 400Vac supply?
Those big Blue industrial plugs and sockets would look really nice in a modern home.
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Old 15th August 2007, 07:26 PM   #3
Nordic is offline Nordic  South Africa
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I wondered why some of my transformers had a 400V tab.
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Old 15th August 2007, 08:02 PM   #4
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I wonder if it's a question of using a 3-phase transformer to get the correct AC voltages, and then rectify the resulting 3-phase. That way the peaks will be 60 degrees apart, rather than the 180 you get from a single phase signal. Much easier to smooth.
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Old 15th August 2007, 08:28 PM   #5
AKN is offline AKN  Sweden
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Hi (Hej) runebivrin,

Quote:
I wonder if it's a question of using a 3-phase transformer to get the correct AC voltages, and then rectify the resulting 3-phase. That way the peaks will be 60 degrees apart, rather than the 180 you get from a single phase signal. Much easier to smooth.
Yes, and in addition to that, regeneration of a single phase.
(At least my interpretation of Only You's post.)
It would then be possible to have one really high current phase out from three phases.
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Old 15th August 2007, 08:45 PM   #6
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Quote:
Originally posted by 4fun
Hi (Hej) runebivrin,
Yes, and in addition to that, regeneration of a single phase.
(At least my interpretation of Only You's post.)
It would then be possible to have one really high current phase out from three phases.
Possibly. The original post is vague enough to be interpreted in many different ways. The only reason I can see why you'd want to regenerate single phase from 3-phase is if you have a turntable with a synchronuos motor, and you don't trust the stability of the mains. And still, it would have to be a rather beefy motor to warrant 3-phase supply in the first place.
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Old 15th August 2007, 08:47 PM   #7
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Quote:
Originally posted by AndrewT
Those big Blue industrial plugs and sockets would look really nice in a modern home.
Blue is 160-250V. You need red.
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Old 15th August 2007, 09:00 PM   #8
AndrewT is offline AndrewT  Scotland
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Hi Pinky,
I should have gone out to the workshop to check first. Thanks for keeping us right.

Has anyone seen a three phase toroid?

Maybe we have to use three legged EI transformers?

What else does?
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Old 15th August 2007, 09:20 PM   #9
AKN is offline AKN  Sweden
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Hi,

Quote:
Originally posted by AndrewT

Has anyone seen a three phase toroid?
Yep..

Click the image to open in full size.
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Old 15th August 2007, 09:21 PM   #10
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Eeek!

Scary....
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