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T1: 240MVA Delta/Y 45KV:345KV T2: 210MVA Y/Y 345KV:138KV T3: 180MVA Y/Delta 132KV:13.6KV Region 1 includes the ground, voltage source Vg, and primary of T1. Region 2 includes the secondary of T1 and primary of T2 with an impedance of Z12 between them. Region 3 includes the secondary of T2...

Both of these questions ask for the internal voltage of a machine, but both uses different equations. Why? I know there is something I'm missing and I'm sure it's really simple. For #135, I used E(internal)=E(terminal)+I(X'd) which I got correct. For #522, I used the same equation as #135...

I thought I had this in the bag, but I've done more questions and it was opposite of what I was doing. Can someone clear things up for me. Leading and lagging power factors and their angles. I use a negative angle for a leading (+) pf and a positive angle for laggin (-) pf. Is this correct...

Has anyone tried this online practice problem cafe and is it worth to get? Are the questions different from the NCEES power questions or practically the same? Thanks all.