Isolation transformer question

Discussion in 'General Electronics Chat' started by Gated, Jul 27, 2010.

  1. Gated

    Thread Starter New Member

    Jul 7, 2010
    15
    0
    Hello everyone,

    As we all know, an isolation tranformer is wound with a 1:1 ratio, however, I wondered, I have a 240V to 120V transformer (40 amps output), although it has multiple taps, (it has a 400V primary), I wondered if it can achive simular properties as an isolation transformer? or do I specificly need a seperate true 1:1 transformer along with this one to get proper isolation?

    [​IMG]

    thanks.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    As long as the primary does not have a connection to the secondary as in an autotransformer, you do get galvanic isolation. This thing is still a monster, so the output is going to be awfully lethal. The use of a GFCI outlet with a solid ground would be a good idea for safety.
     
    Gated likes this.
  3. Gated

    Thread Starter New Member

    Jul 7, 2010
    15
    0
    okay, makes sence,
    thank you for your responce.
     
  4. timrobbins

    Active Member

    Aug 29, 2009
    318
    16
    Sometimes the reference to an 'isolation' transformer means more than just a simple power transformer with galvanic isolation between primary and secondaries. 'Isolation' often infers it has additional screens than just the PE screen, and often infers it has a higher level of insulation rating - typically specified by higher voltage withstand rating bw PRI and SEC (eg. 5kVrms 1 min flash).

    Ciao, Tim
     
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