Pradeep ji, In line with the subject , requesting you to consider tutorial for following situations which any electrical engineer may come across in day to day life. 1. How to size a transformer considering connected load and one of the loads as a large capacity motor .The motor is started at the last when other loads are already started and running. The starting of motor as direct on line and maintain a acceptable voltage drop at the motor terminal during its starting 2.One of the examples from the real life of any industrial network and finding min & max fault levels at different locations in the network. 3. Approach to decide size of NGR for generator , Transformer etc. Truely thankfull to you for your efforts and sparing time to educate engineers
at 52:04 i have a question that what if we choose base voltage on generator side instead of on load side(in the present case)? i mean to ask how we will represent load in pu if base voltage differed from rated voltage at load? or is there some convention to puposely take base voltage same as the rated voltage at load? if time permits plz reply...
Sir in the first problem P1 why not zactual= sqrt(3) × j 0.8 ohm Since it is a 3 phase impedence And in question it mentioned j0.8 per phase right sir 13:00
Sir, Thank you so much for the efforts you are putting into the videos. The videos are nicely explained and easily understood. I have a request that kindly make video Lectures on "Decoupled Power Flow Solution and Fast Decoupled Power Flow Solution".
Sir,in single phase transformer there is no question of phase shift b/w primary and secondary currents ,but in 3-phase there is a phase shift due to star delta so where are we considering this phase shift while calculating voltage drop..
in the problem no. 3 , there are different rating if t/f and gen is working -- i want to know what maxm. load can it take ?, and what is the full load current ?
hi sir 27:50 , i think there is a mistake because you did not divide the impedance by 3 to convert star connection before you divide by 8.8. ((6-j6)/3)/8.8=0.2272-j0.2272). pls correct me if i am wrong .
Sir in last problem...there is mistake in Sp.u calculation... Do have a look... It should be... S=40MW@0.9 p.f lag wkt,P/S=p.f P=(.9*40)=36 and Q=sqrt(S^2-P^2) Q=+j17.4 Sp.u=.36+j0.174
@@zaheersuhabuth2677 bro I don't remember anything..it was 3 years back..that time I was preparing for Power System subject for our semester.. That was beautiful time.. beautiful days..somehow I can get that live that time once more!!
still the answer for the last problem is wrong as j8.97% is considered sir , bettter to edit the whole value as it does not make any sense, anyway hatsoff SIR
Sir,In second last problem there is calculation mistake in Zbase, Zbase should be 9.68ohm and In last problem E1 voltage is the voltage before generator impedance, why are u considering 8.97%p.u... The value of E1 should be rather the generating voltage...
can you mention at what minute and second is the mistake? so that i can locate it quickly. for example just typing 0:10:20 will take the video to 10 min 20 sec.
Probably the best explanation on Per Unit System!!! Cheers and keep up the good work!!!
23:09 - 23:13 I believe you made a mistake. You multiplied 400*440 instead of 440*440. Very helpful video. Keep up the good work. Thank you
Once again, thanks for your great work, time and effort. I personally appreciate. Your good deed goes along way for helping others.
this is the best video lecture on youtube for per unit system analysis....couldnot have been than this!!! thankyou so much!
Pradeep ji, In line with the subject , requesting you to consider tutorial for following situations which any electrical engineer may come across in day to day life.
1. How to size a transformer considering connected load and one of the loads as a large capacity motor .The motor is started at the last when other loads are already started and running. The starting of motor as direct on line and maintain a acceptable voltage drop at the motor terminal during its starting
2.One of the examples from the real life of any industrial network and finding min & max fault levels at different locations in the network.
3. Approach to decide size of NGR for generator , Transformer etc.
Truely thankfull to you for your efforts and sparing time to educate engineers
Really really this is very very nice sir...it feels like directly learning from you not like online learning ..
at 52:04 i have a question that what if we choose base voltage on generator side instead of on load side(in the present case)? i mean to ask how we will represent load in pu if base voltage differed from rated voltage at load?
or
is there some convention to puposely take base voltage same as the rated voltage at load?
if time permits plz reply...
sir 44:28 why was Sb2 too taken as 100 MVA instead 40MVA as it was rated
You are a great teacher
Man you are the hero❤️❤️😭😻
Sir in the first problem P1 why not zactual= sqrt(3) × j 0.8 ohm
Since it is a 3 phase impedence
And in question it mentioned j0.8 per phase right sir 13:00
Sir, Thank you so much for the efforts you are putting into the videos. The videos are nicely explained and easily understood. I have a request that kindly make video Lectures on "Decoupled Power Flow Solution and Fast Decoupled Power Flow Solution".
Sir,in single phase transformer there is no question of phase shift b/w primary and secondary currents ,but in 3-phase there is a phase shift due to star delta so where are we considering this phase shift while calculating voltage drop..
Thank you sir. nice video
Excellent Video On PU System.
in the problem no. 3 , there are different rating if t/f and gen is working -- i want to know what maxm. load can it take ?, and what is the full load current ?
Sir, 27.30-27.40 calculation mistake,but you have given the practical knowledge and application oriented, thank you.
I dont know how to thank you Professor
Please upload a video on induction machines .... how to answer questions to find different power and torque and current too, using the Tshape circuit
Thank you !!!
Really u r awesome sir
Sir please upload a video on equal area criterion derivation and swing equation this part is very usefull to us
sir please upload video lectures on synchronous machine
sir i think you should not add the xpu of the generator when getting E1 because it comes before E1
Sir, please make a video on unsymmetrical faults.
Sir please upload video on transformer vector concept
sir, i am waiting for your video about bus bar and types and scheme,,,please make conceptual video of 1 hour or more...
very helpful
pls upload lectures on synchronous machines
sure. will do that in the coming weeks.
hi sir
27:50 , i think there is a mistake because you did not divide the impedance by 3 to convert star connection before you divide by 8.8.
((6-j6)/3)/8.8=0.2272-j0.2272).
pls correct me if i am wrong .
Sir in last problem...there is mistake in Sp.u calculation...
Do have a look...
It should be...
S=40MW@0.9 p.f lag
wkt,P/S=p.f
P=(.9*40)=36
and Q=sqrt(S^2-P^2)
Q=+j17.4
Sp.u=.36+j0.174
U showed this method in two other videos...
NO bro. 40 MW is real power. otherwise, it would have been 40 MVA. makes sense right>?
@@zaheersuhabuth2677 bro I don't remember anything..it was 3 years back..that time I was preparing for Power System subject for our semester..
That was beautiful time.. beautiful days..somehow I can get that live that time once more!!
still the answer for the last problem is wrong as j8.97% is considered sir , bettter to edit the whole value as it does not make any sense, anyway hatsoff SIR
Sir,In second last problem there is calculation mistake in Zbase,
Zbase should be 9.68ohm
and In last problem E1 voltage is the voltage before generator impedance, why are u considering 8.97%p.u...
The value of E1 should be rather the generating voltage...
can you mention at what minute and second is the mistake? so that i can locate it quickly. for example just typing 0:10:20 will take the video to 10 min 20 sec.
Pradeep Yemula
At 00.23.09 sir in calculator you wrote 400 instead of 440v...and last doubt u mention at the end...so no problem...
0:23:09
Yes there is a mistake in the calculation of Zbase at 00:23:09, I had taken 400 instead of 440.
Pradeep Yemula
yes sir...
Excellent Video On PU System.