Transformer mains wiring

Veggiel · 14th June 2012, 08:10 PM

I have a transformer with the following connection points.

0 --- 110V --- 0 --- 110V --- 130V

What would be the best way of wiring it for the mains in Belgium (230V)?

gmphadte · 15th June 2012, 04:13 AM

All the mains supplies have a tolerance and 230V is never rigid.

So connect 110 to zero of the other winding. Leave the fourth 110V tap unconnected and connect mains at extreme 0 and 130V taps.

Gajanan Phadte

DF96 · 15th June 2012, 10:12 AM

If you can do it safely, measure what your typical mains voltage is. I suspect you will find it is nearer 220V than 230V. The 230V is an EU myth, to give the appearance of harmonisation. In practice most of Europe is still on 220V, and the UK (and Ireland?) are still on 240V.

Veggiel · 15th June 2012, 10:20 AM

If I measure it I get between 227V - 228V, so that seems to be closer to 230V.

DF96 · 15th June 2012, 10:35 AM

OK, so you now have to choose between using the 220V connection and having secondary voltages about 3% high or the 240V connection and having secondary voltages about 5% low. It depends on your application. Unless it is a poor quality transformer it should cope OK with 228V on the 220V primary, especially when loaded.

AndrewT · 15th June 2012, 11:52 AM

the stated

Quote:

0 --- 110V --- 0 --- 110V --- 130V

does not give any indication of which tappings are on which winding.

Please clarify what you have !!!!!!!!!!!!

Build up a mains bulb tester.
Use it every time to power up any and every mains powered equipment that you are building or modifying. Every Time, no exceptions.

Veggiel · 15th June 2012, 11:58 AM

I bought the transformer from farnell here is a link: D3652. - DAGNALL ELECTRONICS - TRANSFORMER, 20VA 2X 15V | Farnell België

I have made a bulb tester for a My Ref C, so I will use that to test the setup.

14th June 2012, 08:10 PM	#1
Veggiel diyAudio Member Join Date: Jun 2010	Transformer mains wiring I have a transformer with the following connection points. 0 --- 110V --- 0 --- 110V --- 130V What would be the best way of wiring it for the mains in Belgium (230V)?

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15th June 2012, 04:13 AM	#2
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	All the mains supplies have a tolerance and 230V is never rigid. So connect 110 to zero of the other winding. Leave the fourth 110V tap unconnected and connect mains at extreme 0 and 130V taps. Gajanan Phadte

15th June 2012, 10:12 AM	#3
DF96 diyAudio Member Join Date: May 2007	If you can do it safely, measure what your typical mains voltage is. I suspect you will find it is nearer 220V than 230V. The 230V is an EU myth, to give the appearance of harmonisation. In practice most of Europe is still on 220V, and the UK (and Ireland?) are still on 240V.

15th June 2012, 10:20 AM	#4
Veggiel diyAudio Member Join Date: Jun 2010	If I measure it I get between 227V - 228V, so that seems to be closer to 230V.

15th June 2012, 10:35 AM	#5
DF96 diyAudio Member Join Date: May 2007	OK, so you now have to choose between using the 220V connection and having secondary voltages about 3% high or the 240V connection and having secondary voltages about 5% low. It depends on your application. Unless it is a poor quality transformer it should cope OK with 228V on the 220V primary, especially when loaded.

15th June 2012, 11:58 AM	#7
Veggiel diyAudio Member Join Date: Jun 2010	I bought the transformer from farnell here is a link: D3652. - DAGNALL ELECTRONICS - TRANSFORMER, 20VA 2X 15V \| Farnell België I have made a bulb tester for a My Ref C, so I will use that to test the setup.