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Old 23rd May 2013, 03:22 PM   #11
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OK let's carry on. If we connected 5V AC across Grey-Grey and measured 50V across P1 and 55V across P2, we now need to find out the correct phasing of P1 and P2. Simply connect them in series, if the phasing is correct the voltages will add, if they are incorrect they will subtract. Once you have the maximum voltage coming out of the primaries you have located the 240V primary configuration. You can drop back to the 220V configuration if you are intending on using the transformer at 110V.
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Old 23rd May 2013, 03:32 PM   #12
AndrewT is offline AndrewT  Scotland
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Default Let's sort out the phasing

Use a mains bulb tester.
If any wire is connected up wrongly the bulb lights up to tell you "WRONG" !
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Old 23rd May 2013, 03:35 PM   #13
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Where can i find such a transformer? Any easy way to do this?
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Old 23rd May 2013, 03:38 PM   #14
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Default OK I've drawn a drawing

Lets look at my drawing.

A-B are your P1
C-D are your P2 with the additional bit E
F-G are your S1 Grey - Grey
H-J-K are your S2 Blue-Black-Blue

Connecting B-C should give you the maximum voltage across A-E.

For 240V operation I would connect B-C and then 240V across A-E, D is not connected.

For 220V operation I would connect B-C and then 220V across A-D, E is not connected.

For 110V operation I would connect A-C and B-D and connect 110V across A-B, E is not connected.
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Old 23rd May 2013, 03:40 PM   #15
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Quote:
Originally Posted by AndrewT View Post
Use a mains bulb tester.
If any wire is connected up wrongly the bulb lights up to tell you "WRONG" !

I'm only suggesting testing at 5V bulb tester doesn't work at these voltages.
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Old 23rd May 2013, 03:42 PM   #16
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If you don't know what a 5V transformer is we can hardly help you. You can use any low voltage transformer, 6V, 9V anything handy. It MUST be AC.
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Old 23rd May 2013, 05:10 PM   #17
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Quote:
Originally Posted by KatieandDad View Post
Lets look at my drawing.

A-B are your P1
C-D are your P2 with the additional bit E
F-G are your S1 Grey - Grey
H-J-K are your S2 Blue-Black-Blue

Connecting B-C should give you the maximum voltage across A-E.

For 240V operation I would connect B-C and then 240V across A-E, D is not connected.

For 220V operation I would connect B-C and then 220V across A-D, E is not connected.

For 110V operation I would connect A-C and B-D and connect 110V across A-B, E is not connected.
I finally found a transformer and testet the things. I tried connecting them in all sorts of ways, but the one with the biggest difference was PRIMARY-BLUE connected with PRIMARY-BLACK, sending the current through PRIMARY-YELLOW and PRIMARY-RED. This setup made the output voltage 8 times smaller. This would make the output voltage at 28.75. All other setups would not get above 4 times smaller. I am still a little confused why a should only meassure on the grey wires and not the blue-black-blue ones? Thanks again
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Old 23rd May 2013, 05:41 PM   #18
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Also how low do i want the output to be. The transformer is at least 30-40 years old, so perhaps the 240 volt output voltage was lower than i need it today??
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Old 23rd May 2013, 05:48 PM   #19
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30 years ago we still had 110V and 240V. We are just using the secondaries to measure Np/Ns. Once we have established the secondaries we can move on to seeing what the transformer can be used for.

Last edited by KatieandDad; 23rd May 2013 at 05:52 PM.
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Old 23rd May 2013, 05:49 PM   #20
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You could use any winding for the measurements, I just decided to use Grey-Grey.
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