3 phase AC to DC...

[malua mada!]

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?

 

[Jasen Betts]

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.

 

[Cydrome Leader]

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.

 

[malua mada!]

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.

 

[Jasen Betts]

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.