Technical question

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  • #10587
    admin
    Keymaster

    Which type of transformer give highest secondary voltage?

    1. D/D

    2.D/S

    3.S/S

    4.S/D

    #12400
    admin
    Keymaster

    Transformers with delta
    connected secondaries are seldom used to supply consumer's loads because there is no position for a
    neutral wire, such transformers are used for high voltage transmission between substations.ans may be 1 or 2

    #12401
    admin
    Keymaster

    Bhavik said:

    Which type of transformer give highest secondary voltage?

    1. D/D

    2.D/S

    3.S/S

    4.S/D


    Transformers with delta
    connected secondaries are seldom used to supply consumer's loads because there is no position for a
    neutral wire, such transformers are used for high voltage transmission between substations.

    #12402
    Spir Georges GHALI
    Participant

    Bhavik said:

    Which type of transformer give highest secondary voltage?

    1. D/D

    2.D/S

    3.S/S

    4.S/D


    Dear ;

     

    If you mean the Voltage value between ” 2 phases “, certainly for the same transformer with ” S : Star connection ” we will have the highest voltage value, for the following reason :

    Assume that we have a transformer has on secondary side ” 3 coils ” ( as we have 3 phases ) with ” 231 V ” as the voltage output for each coil, that means we have ” 6 connection points ” that can be connected as follow :

         – For ” D : Delta connection ” : we will have as output only ” 3 points ” ( only 3 phases ) where the voltage value between each 2 points is ” 231 V “.

         – For ” S : Star connection ” : we will have ” 4 points as output ( 3 phases + neutral ) where we will have ” 2 values ” of voltage output that are :

              – ” 231 V between each phase and the neutral

              – ” 231 x √¯3 = 400 V ” between each 2 phases.

     

    Noting that :

        – For secondary : we can change the connection as we need a Neutral point or not.

        – For Primary : we can't do it, because it depends on the supply voltage value.

     

    Regards.

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