Inrush current in transformer

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  • #10603
    Vidhyut S.

    Why there is a huge inrush current flows when transformer is switched on?

    inrush current is refers to maximum, instantaneous input
    current drawn by electrical device when first turned on.
    When a transformer is first energized a transient current much
    larger than the rated transformer current can flow for several
    cycles.this ts caused because the transformer will always have some
    residual flux and when transformer is energized the incoming flux
    will add to the already existing flux which will cause the
    transformer to move in to saturation.
    Due to this the starting current is double the rated
    value. this us not a fault, our protecting system is
    designed such a way that it can with stand with this inrush
    current without any tripping.

    May be this might be helpfull?

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    while transformer is charges theres capacitive effect between turns of winding of x'-mer and it act as a capacitive load when switched on which in turns huge inrush current when switched on.



    Has anyone simulated the inrush current in a transformer with PSCAD?

    Do you know which saturation values should be used?

    If I’m not wrong, the inrush current should be around 8 times higher than the nominal one, but I’m just getting an inrush current two times higher.

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