what is the purpose of tertiary delta winding in auto transformer ?

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  • #10299
    admin
    Keymaster

    Dear all,

    I would like to know , what is the purpose of tertiary delta winding in auto transformer ? Please write.

    Regards,

    Rashid

    #11668
    erickench
    Participant

    A tertiary delta winding transformer would be used for the following:

    1) To limit the fault level on the LV
    system by subdividing the infeed that is, double secondary transformers.

    2) The interconnection of several
    power systems operating at different supply voltages.

    3) The regulation of system voltage
    and of reactive power by means of a synchronous capacitor connected to the
    terminals of one winding.

    It is desirable that a
    three-phase transformer should have one set of three-phase windings connected
    in delta thus providing a low-impedance path for third-harmonic currents. The
    presence of a delta connected winding also allows current to circulate around
    the delta in the event of unbalance in the loading between phases, so that this
    unbalance is reduced and not so greatly fed back through the system.


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