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Find I1, I2 These two configurations have to pull the same power from the 3 phase line(s) but the 1 phase vs 2 phase is not clear and there is probably a 1.73 that's not being accounted for.

I guess it's actually 2 single phase 100kVA transformers, on a 12kV 3 phase system. Case 1 - 12kV high side connected phase to phase. Case 2 - 6.9kV high side connected phase to neutral At full load, what are the primary amps seen by the supply system in each case? If they are different...

consider a 100kVA transformer - Connected phase to phase on 12kv (2 phases of the 3 phase distribution system) it draws 8.3 Amps (each phase) 100*1000/12000=8.3A Connected to one phase and neutral at 6.9 kV a 100kVA draws 14.4 amps (1.73 time more) 100*1000/6930=14.4A In simple terms, why is...

I took in Oct, it was wide open, just has to be bound in CA

I bought a second Casio fx-115ES as a spare, opened it, took it to the exam, bought it home, passed. PM me if you'd like to buy it at a discount, I don't need 2.

Gone. NCEES questions still available.

The GA TECH online class is a great refresher. Do the NCEES problems, do the spinup problems, get the Schaums and go thru it! I have the NCEES and Spinup for sale now. Passed the first time! Yeah!

This is a great reference. I used it and passed the first time. In new new condition, no marks at all. These are $99.99 from spin-up plus shipping. For 1 week - paypal me $75 and it's yours, shipped to your location. Thanks

This is a legit official NCEES copy of POWER questions, opened and read, but zero marks. I passed and this is the book that helped me do it! This is a must have study aid! $25 +$4 shipping - save on the price and no tax. Thanks

I thought if it was bucking it was stepping down, boosting = stepping up...?

sold

Been there done that. Spin-up 2-4 says that one is a step-up/buck, that seems impossible, isn't step up a boost? confused.

Spin-up has several problems on AutoTransformers about terminology. Boost/Buck, Step up/down. I thought I knew, but apparently I don't. Can someone explain how to tell from a connection diagram if an auto transformer is boost/buck? and step up/down? Thanks

This is a legit brand new copy, unused. I bought one, and also just got one with my review course. This is a must have study aid! $35 shipped - save on the price, no shipping and no tax. Thanks

I bought one, and also just got one with my review course in the spring of 2012. This is a legit new copy, unused, cr2011 $35 shipped - save yourself shipping and tax and some coin Paypal preferred. email trooper8 at the server yahoo.com Thanks

If they're all in parallel aren't all the voltages the same? Isn't I1 ( 11/12)Z1 not 11/21? Man, I'm not seeing the diagram of this thing...arg.

GA Tech course was excellent!

Still available or sold?

Several posts indicate a user may not really benefit from all 5. WIll you consider packaging individually, or in pairs?

I was wondering this last night. Any more? I doubt the ncees answeer is wrong.