Author Topic: Toroidal mains transformer winding repair  (Read 1305 times)

0 Members and 1 Guest are viewing this topic.

Offline Chris Wilson

  • Super Contributor
  • ***
  • Posts: 1006
  • Country: gb
  • Race car engineer, dog lover, hoarder.
Toroidal mains transformer winding repair
« on: September 10, 2015, 09:46:56 pm »
I have a 240 V primary, centre tapped 35V 0 35V at 8.6 amps  (600VA) toroidal transformer that someone has shorted primary to secondary by carelessly drilling a hole in the equipments cabinet and putting a self tapping screw into the winding. (I wonder who this idiot could be? Me? Surely not.... :( Even worse, not realising, I applied mains to it... It had a fuse in the primary though, and damage appears very localised.

I have removed the secondary as it's only about 60 turns. Once I un-tape the primary is it viable to remove a turn or two to get rid of the damaged enamelled wire, which seems to be two or three turns only, carefully fit Raychem heat shrink and solder? The alternative is taking off a huge length of wire. Output voltage is not that critical.  Thanks.
Best regards,

                 Chris Wilson.
 

Offline retrolefty

  • Super Contributor
  • ***
  • Posts: 1616
  • Country: us
  • measurement changes behavior
Re: Toroidal mains transformer winding repair
« Reply #1 on: September 11, 2015, 12:25:09 am »
Should work.

 

Offline Stray Electron

  • Frequent Contributor
  • **
  • Posts: 943
Re: Toroidal mains transformer winding repair
« Reply #2 on: September 11, 2015, 03:11:16 am »
  You should also be able to remove a proportional number of turns on the secondary and keep the correct output voltage if you like.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf