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Hi. I am from Japan. And I couldn't register Japanese phone number in the registration form. Could you tell me how do I proceed further?

@Ahmed S. You can choose transformer 7.5 MVA as Sbase and do the calculation. You will get the same result.

Board: JPEC Test taken from Tokyo, JPN.

Finally passed. YEAH!! -Jpn

Hi Zach, i tried too many times but still the same problem☹️

Tried many times. Still invalid ☹️

Me too...

Invalid Coupon Code for me as well.

This question is for finding the condition where system stability is maintained after the fault. From equal angle criteria, for stability of system: area C = area B. Since network restores at 80deg and the power equations are not given we assume this as critical clearing angle. "Critical...

can you try with wildi method as well plz.

From Wildi equation 15.8: For max power/torque; R2/S=IZ1I where R2= 0.3 Z1= r1+jx = 0.2+j(0.25+0.35) = 0.2+j0.6 = 0.632<71.6 deg Therfore, S=R2/IZ1I = 0.3/0.632 = 0.475

You can find hand written pdf solution 3rd edition somewhere in the internet.

@LyceeFruit @tpkjr2006 Thank you for your kind suggestion. I do have the 2017 version as well.

I am 32 Passed FE 1st try Jan 2018 ( from JPN) Failed PE 1st try Oct 2018 PE 2nd try target on Oct 2019

Still waiting for someone to response on this.

Thank you Zach for the attachment, and happy to say that is what i followed. I believe Open wye must be the same approach like open delta that you have mentioned. I wonder if some one agree with my above answers so that i can know i am in right track .

My understanding  may be incorrect but i see the 460.9 statement as following: "When a capacitor is connected on the load side of the motor overload device, line current will be reduced due to an improved power factor, which must be taken into account when selecting the rating of a motor...

If no other adjustments or correction factors are given use 75degC. You can see in NEC'17_Annex D Example D7 doing the same .

I tried to solve Graffeo Ex38 by Wilid method but i got different answers than one in the Graffeo. I think i am missing something with my calculation. Please let me know who have done this problem with Wildi method. For those who don't know the question: "A 120V, 6OHz, 6 pole, delta...

Sorry for the late response. Thank you  @ellen3720 for your kind suggestion. I do have Wildi book. I just want to know if Graffeo Pmax came from same logic as mentioned in Wildi. Yes definitely i will follow Wildi. :)