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Can anyone help me out with Q21. I am not sure if I understand this correctly. On generator we can measure the terminal voltage. So when operating at full load we take 1 pu as the terminal voltage and hence we calculate internal voltage using the E0 = Ex + E formula. So at full load we have E as...

Thank you so much for explaining. That helps a lot.

You are not alone!

looks correct to me

Can anyone help me with this question? I am not sure if I understand the tap setting correctly. I am not quite sure what is restraining winding tap setting. I am assuming that because the two currents (4.8A and 8.3A) on the two sides of the relay are not equal, so there is another CT to make the...

Can anyone explain to me the 9.2t. I am so confused about the distance relay topic.

Can someone explain to me where 3337 comes from?

I have a question. If a single-phase transformer is given rated power, rated voltage, resistance, and reactance. Why is voltage^2/ (resistance+reactance) not equal to the power? If the question asks to calculate the primary/secondary current. Should I use Power/voltage or voltage/...

Question regarding 4.1k Three phase power. I guess I don't understand the solution very well. I posted my solution as well. I got the right answer because that was close to my calculation. Can someone explain the solution? I don't understand why he ignores the reactance of the line when...

Thanks

I have a question regarding the current transformer. For question 1.1m I am unclear about how primary current changes affect the accuracy. Why accuracy is 2*0.3%?

Thanks. I did not even notice there is a relay section in the reference book.

I went through a few practice exams and encountered some relay questions. Normally questions gave you the relay number, and ask you the purpose of the relay. Do I need to remember all the relay numbers? how do I know what type of relay it is during the exam?

I found this induction motor question on youtube. Learned a lot, also have a question for(III) Magnetizing Reactance. Seem like Zack used total NL reactive power to calculate the magnetizing reactance. he calculated that total NL reactive power is 49513 VAR, then used 575 square / 49513 I...

Thank you for the information! exam is coming in one week lol

Thanks. I thought was a transformer in the beginning, my mistake.

problem: Calculate the minimum size of TW type copper conductors required to feed a 45KVA 3 phase continuous load from a 480V/277V 3 phase 4 wire power distribution board. The temperature rating of equipment terminals is 60 C( 140F) The solution uses 45K/(sqrt 3*480) to calculate the ampacity...

Thanks. taking the exam in two weeks. if I fail, I will consider taking the class.

I have a question regarding this one in NEC. 430.24 Several Motors or a Motor(s) and Other Load(s). Conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than the sum of each of the following: (1) 125 percent of the full-load current rating of the...

I see what you mean now. Thanks for your patient. Now I get it.