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  • 3 phase AC to DC

    From Phil Allison@21:1/5 to All on Mon Feb 1 20:56:48 2021
    malua mada! wrote:

    ===============
    I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes.
    the other leg to the Y connection.
    That Y connection gets warm. (why?)


    ** Have you linked the " + "and " - " of each bridge ?

    That is NOT how it is done.

    Google it.

    ..... Phil

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  • From malua mada!@21:1/5 to All on Mon Feb 1 20:26:46 2021
    I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes. the other leg to the Y connection.
    That Y connection gets warm. (why?)
    Should it be connected to DC ground?

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Jasen Betts@21:1/5 to fritzo2ster@gmail.com on Tue Feb 2 08:03:35 2021
    On 2021-02-02, malua mada! <fritzo2ster@gmail.com> wrote:
    I am running 3 phase AC into a set of transformers, Y config, and
    thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes. the other leg to the Y connection.
    That Y connection gets warm. (why?)
    Should it be connected to DC ground?

    The y connection should not get warm, is the connection there good?


    it takes 6 diodes for a threee phase rectifier which is not normally
    called a "bridge", that term is usally reserved for diamond-shaped arrangements that have input on two opposing corners and output on the
    other two.

    --
    Jasen.

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  • From Cydrome Leader@21:1/5 to fritzo2ster@gmail.com on Tue Feb 2 19:51:40 2021
    malua mada! <fritzo2ster@gmail.com> wrote:
    I am running 3 phase AC into a set of transformers, Y config, and thence into bridge rectifiers . One leg of the output side of the transformers goes to the diodes. the other leg to the Y connection.
    That Y connection gets warm. (why?)
    Should it be connected to DC ground?

    The connection between this and that point is wrong.

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From malua mada!@21:1/5 to All on Tue Feb 2 20:37:24 2021
    Sorry I was not aware that the term "bridge" is reserved ... but I AM using 3 bridges. The two AC inputs on each device are joined thus doubling up / paralleling (?) each bridges' diodes.
    I could have done it with one and a half bridges (not doubling up on diode pairs) but why be stingy.

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  • From Jasen Betts@21:1/5 to fritzo2ster@gmail.com on Wed Feb 3 05:30:22 2021
    On 2021-02-03, malua mada! <fritzo2ster@gmail.com> wrote:

    I AM using 3 bridges. The two AC inputs on each device are joined thus doubling up / paralleling (?) each bridges' diodes.
    I could have done it with one and a half bridges (not doubling up on diode pairs) but why be stingy.

    That should work perfwectly so long as the DC terminals all match up.

    The only reason I can think of for heat at the Y point is if the
    terminals are dirty or loose.

    --
    Jasen.

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