leitmotif
Member
In my wanderings I found a web page referring to 12 pulse rectifiers. 12 pulses are done with 3 phase transformer with a wye and a delta secondary. Standard full wave 3 ph rectifiers are connected to the wye and delta and their DC side is paralleled. This is apparently common in UPS's to improve efficiency by reducing THD. This yields 12 pulse because of a 30 degree phase shift between a wye primary and delta secondary (or vice versa).
If I connect wye wye or delta delta both secondary and primary in phase.
OK now I am trying to find out why there is a 30 degree phase shift between the primary and secondary of wye delta. The other question is why 30 and not 45 or,,,,??
Can someone refer me to good reading material please?
Thanks
Dan Bentler
If I connect wye wye or delta delta both secondary and primary in phase.
OK now I am trying to find out why there is a 30 degree phase shift between the primary and secondary of wye delta. The other question is why 30 and not 45 or,,,,??
Can someone refer me to good reading material please?
Thanks
Dan Bentler