kduff70 - Engineer Boards
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design
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TI
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Electrical

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1. I was working this problem from a PE example exam and I was stuck on how the solution to the problem for find the phase current was formulated. I understand the vector property but how was this equation formed to find the phase current has me stuck. thank you for any help on this I have attached the problem and the solution . protection 54.docx
2. I was going over problem 537 of the Pe sample exam . To get a good understanding of this question would the Icharging current flow through the line length of a conductor acting as shunt capacitor to ground therefore the line length , the voltage to ground and the radius of the conductor would play a part in Icharging current. If this is the case shouldn't the radius of the conductor be included in this type of problem? any help with problem would be greatly appreciated
3. I was going over problem 537 of the Pe sample exam . To get a good understanding of this question would this be like the example you had used to describe Icharging current . Which is the line length act as shunt capacitor to ground therefore the line length , the voltage to ground and the radius of the conductor would play a part in Icharging current. If this is the case shouldn't the radius of the conductor be included in this type of problem?

4. thank you very much this was an eye opener
5. Do anyone know how to solve for Line voltage in a delta configuration see attachment please New Doc 2018-09-12 15.31.24.pdf
6. thank you this was the way I thought this problem would have work out by finding the Eg but the way the problem was work on the solution had me confused
7. RG1 any better understanding of the problem?
8. I attach the Kaplan solution to help make sense of the question SKM_364e17091116110.pdf
9. I have been working problems for the PE test in October and came across this problem in Kalpan practice problem. Do anybody have a good ideal on how to solve this problem. Kaplan has a formula but it doesn't seem to work . I have attached the problem . any help on this one will be greatly appreciated
10. Thank you all but I have finally figure it out . I agree with TNPE the base method is the best approach. I attach my hand written calculation to show how I came up with the answer . When finding the Vbase of the motor I took the Vbase of T1 over The ratio of T2 and I get the Vbase of the motor and from there I get the Zpu of the motor .Thank you all for the help NewDoc2017-07-29.pdf
11. This was a practice problem for Kaplan Sample exam PE Power book . I thought I would try some of the problem to get practice but I never came across a V base problem Like this one and it just has me stuck . All other Vbase problem I seem to get from other books . I haven't seen this type of problem any where else to get material on this type of problem .
12. I Thank all you for your help on this I understand finding the impedance in pu , but it just stuck on the beginning step of establishing the V base as 11.1775V . This part has me stuck, For some reason. Is there a way you can show me a step by step approach on just how you were able to get Vbase.
13. Thank you Omer, I get what your saying if to take base voltage coming from the primary side of T1 you would use the ratio (220/25) but when you get to T2 the ratio is reversed it is not clear to me. I'm thinking the voltage base of T1 would be multiplied by the T2 Ratio (130Sqrt3/13) but the problem call for the reverse and that is confusing.
14. I'm sorry but can you explain to me a little more on how the voltage base for the motor side is calculated. I don't understand how the voltage base through transformer 1 is 22(220/25) I thought is should be 22(25/220) if you can explain this part maybe the light bulb in my head will go on , but this part is sticking me .Base on what I think the voltage base should be when it pass through a transformer. Ex. V2= (V2/V1)*V1
15. Here the full Problem Thank you impedanceprob.docx
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