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Old 26th July 2004, 02:58 AM   #1
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Default General ? On Dual Primary Transformers - Double UP?

This question might be related to 50/60Hz cycle on transformers.

Let's take a toroidal transformer with the following description:

Dual Primary: 115/230VAC
Dual Secondary: 0-18 & 0-18

From a 230VAC mains power source. We would SERIES the primary and to get 0-36 volts on the secondary we would series them also.

My question is, would it be safe to run 230VAC if we PARALLEL the primary so we can get double the voltage output on the secondary? What impact would doing this have? (more noise?)

BQ
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Old 26th July 2004, 07:10 AM   #2
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As far as I understand, the transformer will anyhow keep its original maximum power rating. If so, doubling up the voltages as you plan will pull the maximum current rating down to half.
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Old 26th July 2004, 07:52 AM   #3
moamps is offline moamps  Croatia
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Default Re: General ? On Dual Primary Transformers - Double UP?

Quote:
Originally posted by Super_BQ
My question is, would it be safe to run 230VAC if we PARALLEL the primary so we can get double the voltage output on the secondary?
No.
Usually, you will destroy transformer.

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Old 26th July 2004, 08:34 AM   #4
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Default Re: General ? On Dual Primary Transformers - Double UP?

Quote:
Originally posted by Super_BQ
My question is, would it be safe to run 230VAC if we PARALLEL the primary so we can get double the voltage output on the secondary? What impact would doing this have? (more noise?)
Unless you specifically know otherwise with the transformer in question, the answer is no. The usual effect is destruction of the transformer.
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Old 26th July 2004, 09:37 AM   #5
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Audiofreak,

Is the destruction happening due to increased current in primary side? Or, is the story more complicated? Thanks.
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Old 26th July 2004, 10:20 AM   #6
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I don't understand why the transformer would be destroyed? Maybe someone could explain that to me. The only reason I can think of is that the primary current would be doubled and the primary windings may not be able to handle the extra current.
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Old 26th July 2004, 10:30 AM   #7
moamps is offline moamps  Croatia
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Quote:
Originally posted by kilowattski
I don't understand why the transformer would be destroyed? Maybe someone could explain that to me. The only reason I can think of is that the primary current would be doubled and the primary windings may not be able to handle the extra current.
Hi,

You can find some infos here:
http://www.allaboutcircuits.com/vol_2/chpt_9/11.html

Regards
Milan
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Old 26th July 2004, 10:34 AM   #8
dnsey is offline dnsey  United Kingdom
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Depending on how it's wound, the primary winding might not be designed for the resulting voltage gradient, leading to insulation breakdown, shorted turns, and a possible fire hazard.
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Old 26th July 2004, 11:08 AM   #9
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Thanks, moamps!!!
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Old 26th July 2004, 11:29 AM   #10
moamps is offline moamps  Croatia
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Originally posted by jh6you
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