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1...Removing Magnetic Shunts??

Discussion in 'Electronic Basics' started by Randy Gross, Sep 25, 2003.

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  1. Randy Gross

    Randy Gross Guest

    I read a very good analogy of Magnetic Shunts at the Pupman site where it
    was discussed that the shunts were like putting a large inductor in series
    with an Ideal transformer, diverting a portion of the flux back to its
    source.

    By removing the shunts, I assume the full rated KVA of the transformer is
    available? My question is: What are the negative effects (if any) of this
    action?
     
  2. Don Kelly

    Don Kelly Guest

    ----------
    I would be interested in this article -where is it on the site? If my
    understanding of magnetic shunts is correct, the analogy you mention is not
    a good one. I see these as simply a way to divert some of the primary flux
    so that it doesn't couple the secondary winding (i.e. making the
    transformer poorer). This would decrease the output voltage at all
    loads -somewhat different than the effect of a series inductor.
    Without more information I cannot analyse the device and my comments above
    may be dealing with a different concept in a different application.
     
  3. Now I thought that magnetic shunts were used mostly in ferro-resonant
    transformers such as in microwave ovens and street lights for
    secondary voltage regulation. The shunts cause the coupling into the
    secondary to saturate at a certain primary resonant current, to limit
    output voltage in the secondary. This resonant current is also high
    enough to store significant energy so you can get through a missing
    cycle. If you remove energy from the secondary, the shunt unsaturates
    and more energy is coupled into the secondary. Removing the shunt will
    cause the secondary voltage to rise and will destroy the resonance
    with the capacitor on the primary.
    Please correct me if I'm wrong.

    ....Stepan
     

  4. Not being a professional ee or designer like some of the others claim
    to be... I think the rated kva of a transformer with current limiting
    shunts is with the shunts installed....in other words the core is
    designed to include the shunts

    If the transformer is designed to be operated with the shunts
    installed then removing too many or all of them would cause the core
    to saturate...the primary will draw more current and the secondary
    output will not see any increase........you could burn up the primary
    windings

    When you remove a few shunt plates you will increase the current
    output on the secondary but will generate more heat in the transformer
    and if you remove too many shunts you may risk burning up the
    secondary winding or windings.

    I would remove a few shunts at a time and would then test the
    transformer monitoring input current and output current.....you will a
    reach a point where the input current and heat keeps rising with no
    significant increase in output.
    Doing any more will only saturate the core.

    Ive done quite a few neons and oil burner igniton transformers.....did
    a couple of oddball transformers. Never left more than 50 percent of
    the plate out though......

    Now then........lets see........I bottom posted so that will keep the
    really anal off my back here .....oh.... I must warn you that I am a
    hobbyist and not an engineer with a design business in my basement or
    spare bedroom like some of the more educated guys on here.......but I
    have offered this post from my personal experiences.......

    be carefull......experimenting with electricty can kill you or at
    least turn you into a complete asshole like it has done to a few of
    the posters in here...
     
  5. John Fields

    John Fields Guest

    One for sure... Keeping one hand in your pocket doesn't mean you can
    use the other one to adjust the spacing of a Jacob's ladder when it's
    running.
     
  6. On Sat, 27 Sep 2003 13:46:23 -0500, John Fields

    Could someone please post a picture of the core and shunt plates?
    Or a link to a picture? Thanks
     
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