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Transformer Help

axel2016

Dec 14, 2016
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Dec 14, 2016
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Hi!

Have found this transformer in my cellar. P1030831.JPG P1030832.JPG
The red wired shows continuety and so does the blue wires. The green black and white on the other side all shows continuety.
My bet is that the red and blue are two seperate outputs?
But what about the three wires. Which two are for mains?
Next to the four wires it says SUWA.

Can someone guide?
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Jan 21, 2010
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For a step down transformer the mains input leads are typically thinner than the secondary output leads. However the black and white colours are suggestive of mains input. But the green tapping is not.

All up, I would be very careful.

Sorry for the non-answer.

Whatever you do DO NOT just connect it to the mains to see what happens. You need more information (which you're asking for) and to proceed one step at a time to ensure both your and the transformer's safety.
 

axel2016

Dec 14, 2016
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I found that there is 90 ohms between black and white.
56 ohms between white and green.
30 ohms between black and green.

The three Wires are connected with half as thin leads than that og the four.
 
Last edited:

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Green is a color I would not associate with mains wiring (except as an earth, which this wouldn't be).

For 110 vs 220 volt windings you would likely have 2 separate windings placed in series or parallel to allow operation at the same power levels.
 

ramussons

Jun 10, 2014
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How about measuring the Blue and Red combinations? Are they independent or interconnected?
My guess would be 2 independent primary windings (Red-Red and Blue-Blue) for 110/220 volt operation.
Secondary is X volts and 2X volts - say for output as 3 Volts, 6 Volts and 9 volts.

You can feed a 6 volts AC to the Black White wires and read the voltages across the other leads. That should give some idea.
 

axel2016

Dec 14, 2016
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I tried with 13v ac on the black and white. The gave me 1.8v on the reds and 0.7v on blue and also 0.7v on blue and red.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
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Well, if you assume the black and white are 120V, it makes the other windings 16.5V, 6.4, and 6.4
 

Herschel Peeler

Feb 21, 2016
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Now that you have a good idea of voltages look at similar transformers of that type and size for an idea of currents.
 
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