Why three types of dotted are required for three legged transformer

Discussion in 'General Electronics Chat' started by reaz, Jun 30, 2015.

  1. reaz

    Thread Starter New Member

    Jul 14, 2011
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    My question is why three types of dotted are required for three legged transformer.The mutual windings for three legs are negative.
    M12=M21=M31 all are negative, why?
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,542
    2,369
    Can you post an example?
    Dots indicated on a transformer winding usually mean the same winding direction point.?
    Max.
     
  3. reaz

    Thread Starter New Member

    Jul 14, 2011
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    Please see the slides # 34.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Would it be possible to mention on which page of this 97 sheet haystack you hid the needle?
     
  5. reaz

    Thread Starter New Member

    Jul 14, 2011
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    Slide no. 34
     
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