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I've seen 2 different equations  from 2 different references for finding the GMD for 4 conductors. -one used (D12 x D23 x D13 x D14 x D24 x D34)^(1/4) -the other used (D12 x D23 x D13 x D14 x D24 x D34)^(1/6) i assume one of them is wrong? which one is correct? im leaning towards the 6 root...

Can someone please explain the solution to me? Question: A wye-wye, 230 kV, 3-ph transmission line is being stepped down to 200 kV using three autotransformers connected between the neutral and the line. For each phase, if the autotransformer is rated for 500 MVA, and the turns ratio is 5:2...

Please explain to me why sin(delta2) = (P1/P2)*sin(delta1) I don't understand how it got to that step. can someone please show the steps leading up to how sin(delta2) is determined? Thanks!

Hello, What equation is being used in the solution? (question from Kaplan sample exam) Is max torque synonymous to max power?  In Graffeo's book I see the formula: Slip at which Pmax occurs at = Sp = Rrotor/(Rrotor + Zeq), where Zeq = Zmotor + Zstator. But this equation seems slightly...

I often find myself making the mistake of using Vpp rather than Vpn and vice versa. After I see the solution and realized the mistake I made, it seems so obvious from the start that I should have used Vpn. Question 1: are there any techniques or rules to follow to be sure what voltage potential...

turn ratio = (Npri/Nsec) = (Vpri/Vsec) = (Isec/Ipri) shouldn't Ipri in the example be Ipri = (Irelay)/(CT ratio)??

Hi, I've always used this rule of thumb: lagging generator (over-excited): exporting Watt and exporting VAR leading generator (under-excited): exporting Watt and importing VAR lagging motor (under-excited): importing Watt and importing VAR leading motor (over-excited): importing Watt...

Hi, Can someone answer these questions: 1) Am I correct in thinking that Vbc = 480V and Vab = 120V? 2) Why is only I2 multiplied by 600V? Thanks

Hi, can someone explain to me the whole 'two wires' thing in single phase circuit and why the impedance is 2 times. Thanks in advance

Hi, this is a figure in the 2016 printing of the Graffeo book, page 148. Is there a typo in describing the direction of current above the CT on I2 side? The description is the same before and after the fault...why?  I tried checking the errata on Graffeo's website but this page is not...

Hi, My challenge is Ex. 53 d) of the Graffeo book, 2016 printing. see attached photo. The part where he says "now square it to get rid of the j" Why is it not (3Rg)^2 = (0.48-j0.38)^2 ?? am I an idiot? Im being serious.

Can someone please explain to me ex.10 in the graffeo EE guide to passing the power PE book? I don't understand how to get 22.78 49.4 degress from Zld = 35(j30)/(35+j30)