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Old 26th Mar 2020, 1:58 am   #5
trobbins
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Join Date: Oct 2009
Location: Melbourne Australia
Posts: 898
Default Re: Three phase transformer

Can we clarify details a bit please.

Are there multiple 400VAC to 24V 40A DC output rated power supplies?

Did each of those power supplies contain a transformer along with 3ph diode rectifier (and capacitor filter) and have a 24V 40ADC rating?

Was the transformer a single 3-leg transformer core, with a primary side wye winding (ie. each core leg has a winding, and the three windings are connected at one end with a star connection, and the other three winding ends connect to '400VAC' phase terminals? Did the power supply have a neutral connection, and was that connected to the star connection, or just used for control purposes (in which case the star connection was a floating star)?

How were the rectifier diodes connected to the secondary windings (supposedly three windings on the 3 legs).

I presume the transformer doesn't have a rating plate or any label.
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