Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Pass Labs This forum is dedicated to Pass Labs discussion.

General ? On Dual Primary Transformers - Double UP?
General ? On Dual Primary Transformers - Double UP?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 26th July 2004, 03:58 AM   #1
Super_BQ is offline Super_BQ
diyAudio Member
 
Super_BQ's Avatar
 
Join Date: Sep 2001
Location: New Zealand / Canada
Send a message via ICQ to Super_BQ Send a message via Yahoo to Super_BQ
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
__________________
Yellow People for a Yellow World
Vote for Super_BQ, the Asian Alternative
  Reply With Quote
Old 26th July 2004, 08:10 AM   #2
jh6you is offline jh6you
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
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.
  Reply With Quote
Old 26th July 2004, 08:52 AM   #3
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
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.

Regards
Milan
  Reply With Quote
Old 26th July 2004, 09:34 AM   #4
AudioFreak is offline AudioFreak  Australia
Warp Engineer
On Holiday
 
AudioFreak's Avatar
 
Join Date: Oct 2001
Location: Queensland, Australia
General ? On Dual Primary Transformers - Double UP?
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.
__________________
- Dan
  Reply With Quote
Old 26th July 2004, 10:37 AM   #5
jh6you is offline jh6you
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
Audiofreak,

Is the destruction happening due to increased current in primary side? Or, is the story more complicated? Thanks.
  Reply With Quote
Old 26th July 2004, 11:20 AM   #6
kilowattski is offline kilowattski  United States
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
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.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 26th July 2004, 11:30 AM   #7
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
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
  Reply With Quote
Old 26th July 2004, 11:34 AM   #8
dnsey is offline dnsey  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: Shropshire, England
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.
  Reply With Quote
Old 26th July 2004, 12:08 PM   #9
jh6you is offline jh6you
Account Disabled
 
Join Date: Aug 2002
Location: Near to the Pacific Ocean
Thanks, moamps!!!
  Reply With Quote
Old 26th July 2004, 12:29 PM   #10
moamps is offline moamps  Croatia
diyAudio Member
 
Join Date: Oct 2002
Location: Croatia
Quote:
Originally posted by jh6you
Thanks, moamps!!!
  Reply With Quote

Reply


General ? On Dual Primary Transformers - Double UP?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Single or double transformers for dual mono amp? Bernie7 Class D 1 30th December 2008 02:19 PM
dual primary//dual secondary toroid larryg Chip Amps 22 6th September 2006 10:24 PM
Dual primary wiring for Plitron standard toroid sardonx Chip Amps 6 3rd August 2005 06:16 AM
Finding phase of dual primary tranny sbear Pass Labs 4 26th February 2005 08:11 AM
What ratings stay constant in a dual primary 110/220 xfrmr? leadbelly Parts 1 25th March 2004 03:40 PM


New To Site? Need Help?

All times are GMT. The time now is 06:09 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki