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Thread: Transformer connection

  1. #11
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    Jan 2016
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    Quote Originally Posted by electrofelon View Post
    I didn't see any mention of using transformers in parallel.
    the drawing shows a 2.5 mva d-d in parallel with a 5 mva d-y
    whether they will both be energized is not clear
    The difference between genius and stupidity is that genius has its limits.

  2. #12
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    Jan 2017
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    Quote Originally Posted by Ingenieur View Post
    you connect a wye sec in parallel with a delta sec?
    No sir we will replaced the existing 2.5MVA Δ-Δ, by 5MVA Δ-Y transformer. DOes this have an effect to the loads

  3. #13
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    Quote Originally Posted by NewtonLaw View Post
    When you connect two three phase transformer banks in parallel you must consider the phase relationship between the two transformer banks. Connecting Y-Y or D-D causes zero degree or 180 degree phase shifting depending on the connections made. In the case of a Y-D or D-Y connection you may have a 30 degree or 210 degree phase shift and this must be accounted for. Last placing a Y-D in parallel with D-D you force a 30 phase shift between the two that can not be ignored and it will cause short circuit current to flow.

    Hope this helps.
    No sir, We didn't bank it parallel, we will replaced the existing 2.5MVA Δ-Δ, by 5MVA Δ-Y transformer. Does this have an effect to the loads

  4. #14
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    Jan 2017
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    Quote Originally Posted by Ingenieur View Post
    the drawing shows a 2.5 mva d-d in parallel with a 5 mva d-y
    whether they will both be energized is not clear

    No sir, We didn't bank it in parallel, we will plan to replace the existing 2.5MVA Δ-Δ, by 5MVA Δ-Y transformer. Does this have an effect to the loads

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