APC Symmetra PX Static Bypass Switch 160kW - 3-phase transformer

Thread Starter

max.wwwang

Joined Jun 24, 2019
29
Continue exploring this big unit...

I found this transformer in the same unit but struggled with its winding/wiring (and how it may be used in 1-phase).
IMG_1994.JPGIMG_E2034.JPGIMG_2124.JPG


7 wires in total. Br(own)/G(reen)/W(hite)/Y(ellow)/R(ed)/B(lue) + Bk (black).

From the PCB I already figured out Br/G/W are input 3 phases.

The resistance between the wires are:
Between any pair in Br/G/W, or any pair in Y/R/B: 350 Ohm
Between Bk and any of the other 6 wires: 175 Ohm
Br-Y, G-R, W-B: all about 3 Ohm

How the winding/wiring of this transformer could be? I have read this article which is very useful but I didn't find any winding which would give such connectivity/resistance measurement.

I guess Bk is the shared centre line of two stars (Br/G/W and Y/R/B) but the rest?

Would appreciate anything hits especially about: 1) its winding; 2) its possible function; 3) any potential use with 1 phase only. Thanks.
 
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Thread Starter

max.wwwang

Joined Jun 24, 2019
29
From the circuit board. It seems the 'output' 3 lines (Y/R/B) go to a 12 pulse rectifier (with 12 diodes) and 2x 450V capacitors which are apparently for 3-ph AC/DC conversion. Seems like no voltage change like an isolation transformer but all wires are electrically connected so clearly not an isolation one.
 
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