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  1. #1
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    Short circuit fault on a transformer

    Hello,

    I've connected a 220/190VAC transformer to a 160-190/12VAC transformer, whereas the outputted 12VAC is connected to a single phase full bridge rectifier.


    The 12VDC is then connected to a voltage divider with output of 5VDC

    This 5VDC is shunted with a 100pf ceramic capacitor.

    There was a severe short-circuit causing the main electricity to a temporary shutdown.

    When I disconnected the circuit from the power line, and made a short circuit test upon 220/190VAC transformer, I saw that the GND of the TR is short circuited with the 190VAC as well with the 220VAC terminals.


    I made this same SC test with the 160;220/12VAC TR, and also saw the high level voltages terminals are short circuited as well as the low voltage terminals also short circuited.

    The resistive voltage divider circuit was burnt.

    Both TR are permanently short circuited.


    Anyone have explanations about what happened??

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  2. #2
    Member level 3
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    Re: Short circuit fault on a transformer

    Are you sure the transformers are two winding transformes or an auto transformers



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  3. #3
    Advanced Member level 3
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    Re: Short circuit fault on a transformer

    Chances of secondary winding getting short circuit are less and the low resistance of the secondary could get registered as a short if not carefully measured.


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