How to Draw Transformer Phasor Diagram

  Рет қаралды 208,232

Study EETech

Study EETech

Күн бұрын

Пікірлер: 129
@pranjalsachan1179
@pranjalsachan1179 3 жыл бұрын
this is the best video on this topic, no unnecessary stuff; short, compact and to the point
@tharindumaduwantha1023
@tharindumaduwantha1023 2 жыл бұрын
I watched many videos to understand this but nothing better than this video .. great explanation
@ayushjena7624
@ayushjena7624 5 жыл бұрын
Use thicker and darker cursor/pointer.... It's really hard to notice
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you ayush for your precious feedback. i will rectify this. you can watch our new videos, which cane recently in the channel.
@PunitKumar-bf5te
@PunitKumar-bf5te 4 жыл бұрын
2hr dusre video par waste karne k baad aapke video mile thanks a lot for explaining in superv way and minimum time
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you punit. inspired by precious feedback. we have come up with a comprehensive lecture series on power electronics. u can watch that also.
@monicamibang3571
@monicamibang3571 3 жыл бұрын
So far the best explanation on this topic. Cleared all my doubts. 🤘👌
@kakomamululu8652
@kakomamululu8652 5 жыл бұрын
This just clarified everything.. Thank you good sir. 🎓🤝👏👏
@studyeetech2804
@studyeetech2804 5 жыл бұрын
thank you very much.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
recently we have come up with a comprehensive video lecture series on power electronics. u can watch them too.
@chandankumar-6
@chandankumar-6 2 жыл бұрын
Thank you bro for this video lecture. This video help me alot. I had confusion in the phasor diagram, but after watching this video it clear my all concept. 👍💕
@mohdasman1048
@mohdasman1048 5 жыл бұрын
This is powerpack lecture... All in one... Thankful to u sir
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you dear, you're most welcome. recently we have added a comprehensive video lecture series on power electronics. u can watch that.
@nyashas7608
@nyashas7608 2 жыл бұрын
thank you sir.....very informative video on phasor diagram of transformers...got my doubts cleared because of you..keep it up👍👍
@epsa9324
@epsa9324 2 жыл бұрын
This is the video that I was looking for..... I watched so mannnyyy videos....but this one has got everything covered...... Thanks dude
@malisujithkumarreddy8748
@malisujithkumarreddy8748 4 жыл бұрын
Excellent explanation bro tqq so much
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you much dear. we have come up with a comprehensive video lecture series on power electronics in our channel. u can watch that also.
@Handwrittenotes2064
@Handwrittenotes2064 Жыл бұрын
Very impactful and knowledgeable educational video I am very glad that i have seen this video and learnt something Thankyou very much again 👍
@bikramjeetdasgupta
@bikramjeetdasgupta 2 ай бұрын
4:36 it's still ideal when u consider the copper loss and leakage flux in primary then its practical
@yashparmar5722
@yashparmar5722 2 жыл бұрын
Thanks bro SAB ache we samjh aaya mereko thanks a lot
@jiyaaa410
@jiyaaa410 8 ай бұрын
such a commendable explanation!!!!....best video on this topic🙌🙌🙌
@sayandutta8985
@sayandutta8985 4 жыл бұрын
Very nice explanation thanks a lot
@AdityaGarg-s7v
@AdityaGarg-s7v Ай бұрын
Great explanation.
@EVtalkMS
@EVtalkMS 4 жыл бұрын
Thanku so much sir, you make the the tough topic very easy to understand
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you manav for your complement. recently we have come up with a comprehensive video lecture series on power electronics. u can watch that also if you want.
@ashishpandey201
@ashishpandey201 3 жыл бұрын
Thank you for this vedio sir am so confused in book but your vedio clear my doubts
@ARGAMING_69
@ARGAMING_69 5 жыл бұрын
good work man it helps a lot.Appreciate your work. Thumbs up
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
i m honoured dear. thanks. recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@ritikgupta7095
@ritikgupta7095 4 жыл бұрын
Nice explanation. I understood well. Thank you sir.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
you are most welcome ritik. we have come up with a comprehensive lecture series on power electronics. you can watch that also 🙂🙂🙂
@sayansarkar8348
@sayansarkar8348 5 жыл бұрын
best phasor diagram video. GIVE THIS MAN A FVCKING AWARD
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you sayan. thank you very much. recently we have added a new comprehensive video lecture series on power electronics. please watch them too.
@Yashwanth_X
@Yashwanth_X 2 ай бұрын
Thank you sir😊
@NAMANGARG-oe5ls
@NAMANGARG-oe5ls Жыл бұрын
thankyou so much sir for yhis video
@chethankumar1541
@chethankumar1541 Жыл бұрын
Tqsm sir ❤🎉
@bharatgoyal6459
@bharatgoyal6459 4 жыл бұрын
Sir please use a pointer which is easy to notice, genuinally it took me double time to finish the video cause i have to find out the pointer first after every new line
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
ya i know... actually i didn't know that time how to use highlighted pointer. thats why i couldn't use that. i will rectify this in coming videos. by the way recently a comprehensive video lecture serieshas been added in our channel. u can waty that if uou want. Again thank you bharat for your feedback.
@SharanTejChappali
@SharanTejChappali 2 ай бұрын
Bro why didn't you consider -E1 in the primary sidee
@nicom8776
@nicom8776 3 жыл бұрын
So useful, thanks a lot bro
@wellingtonpazmino58
@wellingtonpazmino58 3 жыл бұрын
Grear Video!!! I have observations and questions: The resulting diagram that you get will not satisfy these equation V1=E1+I1R1+jI1X1. Why E1 is -E1? There are many books with different phasor diagram, for example: Example 1: magnetic circuits and transformers ee staff mit. This has a convention where the resulting diagram that you get satisfy these equation V1=E1+I1R1+jI1X1. Example 2: AC Machine Theory - A.Langsdorf. This your convention but This mentions the other way to graph the phasor diagram indicated in the previous book. So, Could you explain me about these different points of view? My conclusion is that your convention does not handle the point convention but the other one does handle the point convention. it is correct? As would be the procedure to establish a phasor diagram for an equivalent circuit of the transformer. It would be to establish the signs of the voltages and directions of the currents and based on the equations draw the diagram.
@SaiPrashanthMallareddy
@SaiPrashanthMallareddy Ай бұрын
1:03 starts
@deepanshupal2003
@deepanshupal2003 2 жыл бұрын
Amazing video ❤❤
@rushtamchakraborty3271
@rushtamchakraborty3271 Жыл бұрын
Nice one ! 👍 quite easy to understand ! 😌
@sanvithshetty4234
@sanvithshetty4234 Жыл бұрын
Please do vedios according to vtu eee 21 scheme🙏🏻🙏🏻❤ it would be great help fr Karnatka students 🙏🏻🙏🏻🙏🏻
@khalilomar6364
@khalilomar6364 2 жыл бұрын
12:30 Why isnt it -V1. I am asking this because -V1=I1R1+I1X1-E1
@YEC-jz3hv
@YEC-jz3hv 5 жыл бұрын
this video helps me to how to draw a phasor diagrams
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
i m happy to know this ayithi. thank you very much. recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@mohdadal2768
@mohdadal2768 7 күн бұрын
Sir please explain the capacitve load on also. Phasorr diagram
@rockstar1720003
@rockstar1720003 3 жыл бұрын
Super explanation!
@wellingtonpazmino58
@wellingtonpazmino58 3 жыл бұрын
Hi, Could you explain me Why E1 is -E1?
@jaymol4424
@jaymol4424 2 жыл бұрын
Because EMF(E1) is always induced such that it tends oppose the change producing it in that case, the primary side of things(Lenz Law). That's why E1 was placed on the -y axis and was brought back to y-axis albeit negative. Atleast, thats the rationale I came up with.
@jaymol4424
@jaymol4424 2 жыл бұрын
Assume there are no loss of energy in the primary side of things, and V1=E1. E1 will be equal but opposite to V1. Hence, if its placed in the +y axis it ought to be negative.
@nayabashfaq9560
@nayabashfaq9560 3 жыл бұрын
Sir pls make video on phasor diagram. By that we can draw any phasor diagram to any circuit
@sanchimittal9614
@sanchimittal9614 5 жыл бұрын
Thank you very much sir! It was really good and helpful
@studyeetech2804
@studyeetech2804 5 жыл бұрын
thank you very much.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
recently we have added a new comprehensive video lecture series on power electronics. u can watch them too.
@ashoknani559
@ashoknani559 5 жыл бұрын
Sir your explanation is good but that arrow is not visible correctly, that is the negative, so i think you will correct next time sir
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
yes yes ashok. actually you know what... when i started to record screen i didn't know how to highlight the cursor and record. now i learnt. i wl rectify this problem next time. by da way recently we have come up with a comprehensive video lecture series on power electronics. u can watch them too.
@marvnet8898
@marvnet8898 3 жыл бұрын
You don't show us on the diagram the sign + for the voltage. Why? Maybe it's irrelevant but form me it would be much easier to follow your explanation
@Sailor_worldwide1
@Sailor_worldwide1 4 жыл бұрын
⁷ leading power factor can u please tell me why the current I1 got shifted up closer to -E1?
@053_abdulhannanbhat8
@053_abdulhannanbhat8 3 жыл бұрын
Same question
@abhisheksahoo2722
@abhisheksahoo2722 4 жыл бұрын
Ideal transformer with load?
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
okay we will make video on that also. we are a small team. so more time we required.
@mayaacademyahiwara634
@mayaacademyahiwara634 4 жыл бұрын
4:15 E and V are opposite due to.... Reason?
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you sam. i have explained the the thing in spandan Dash's comment. please read that one. i can't copy the text from that. and yes, we have come up with a comprehensive video lecture series on power electronics. u can watch that also.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you very much tor raising the question. actually i had this doubt also. i researched a lot. in m g say's book i have seen -E1 is not taken. it was drawn in the same direction as V1. But l have I have seen in oiher other books that lhey have drawn E1 in 1he reverse direction as -E1. Both are seemed to bc correct 'Nith respcctive logic. That actually made the confusion, which convention to be followed. Then in one NPTEL lecture from lIT KHAPAGPUR, the profossor told that actually both phasor diagram correct. Actually 'Nhen the transformer parameters calculation is concerned from the phasor, both the phasor diaqram vvill produce same result. So any convention can be followed. I can send you the link of the nplel lecture if you want. i have to fmd it in the KZbin. it id available there. by the way, recently we have come up with a comprehensive video lecture series on power electronics. you can watch that if you want.
@akshatmishra1784
@akshatmishra1784 5 жыл бұрын
thankyou very much😊
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
you're most welcome akshant. recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@pavanrepuri
@pavanrepuri Жыл бұрын
Why the primary e1 takes as minus? Expalin
@YASASWIPALLI
@YASASWIPALLI Жыл бұрын
Sir please increase the curser sir or else please change the curser symbol. It's not clear . It's hard to find the position of the curser
@RaviKant-pq7oe
@RaviKant-pq7oe 5 жыл бұрын
Very super Sir ji
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you ravi. We have come up with a comprehensive video lecture series on power electronics. please watch them too.
@papun8450
@papun8450 4 жыл бұрын
Good one.
@surendrakverma555
@surendrakverma555 4 жыл бұрын
Very good
@kirtisCreativity
@kirtisCreativity Жыл бұрын
Best one
@snehlata3924
@snehlata3924 2 жыл бұрын
Why i1 increase if E1 decreases
@Amitkumar-qq8dq
@Amitkumar-qq8dq 5 жыл бұрын
Video is good but when you say this that time i find where is arrow due to small size plz increase the size of arrow
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
sure amit. i will do that next time. actually when I started the video making i didn't know how to highlight the cursor and record. i learnt nw. this won't be problem anymore. by da way recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@anikhasanmasum2194
@anikhasanmasum2194 5 жыл бұрын
@study eetech please show the cursor big ,i can't able to find where are you are pointing
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
yes anik. actually when i started the channel i didn't know how to highlight cursor and record the screen. definitely i wl keep this thing in mind. by da way recently we have come up with a comprehensive lecture series on power electronics in this channel. please watch that also
@Bittu_777
@Bittu_777 2 жыл бұрын
guys who are watching this video after 3 years 😂😂
@vinod4672
@vinod4672 9 ай бұрын
Even Your comment become one year old
@LibanAdan-qu7gq
@LibanAdan-qu7gq 6 ай бұрын
😂😂😂
@mohammedaamer045
@mohammedaamer045 5 жыл бұрын
Why I2 lags E2 .....I can't understand.
@EVtalkMS
@EVtalkMS 4 жыл бұрын
Mohammed Aamer04 basically it is a theoritical concept that whenever mentioning that lagging or leading of a load is present then we always consider the current should be lead or lag w.r.t the voltage
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you very much tor raising the question. actually i had this doubt also. i researched a lot. in m g say's book i have seen -E1 is not taken. it was drawn in the same direction as V1. But l have I have seen in oiher other books that lhey have drawn E1 in 1he reverse direction as -E1. Both are seemed to bc correct 'Nith respcctive logic. That actually made the confusion, which convention to be followed. Then in one NPTEL lecture from lIT KHAPAGPUR, the profossor told that actually both phasor diagram correct. Actually 'Nhen the transformer parameters calculation is concerned from the phasor, both the phasor diaqram vvill produce same result. So any convention can be followed. I can send you the link of the nplel lecture if you want. i have to fmd it in the KZbin. it id available there. by the way, recently we have come up with a comprehensive video lecture series on power electronics. you can watch that if you want.
@nikunjjadhav125
@nikunjjadhav125 5 жыл бұрын
Please use curser with another colour bhai Becoz at last part it is just invisible
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
yess nikunj. i wl do that next time. i didn't know that time jow to highlight the cursor. now i learnt. by da way recently we have come up with a comprehensive video lecture series on power electronics. u can watch that.
@someshfengade9623
@someshfengade9623 5 жыл бұрын
Im is developed due to v1 but what is the reason that the e1 will oppose v1 according to the transformers emf equation (e2)/(e1)=(n2)/(n1)=(v2)/(v1) so why should e1 oppose v1
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you very much tor raising the question. actually i had this doubt also. i researched a lot. in m g say's book i have seen -E1 is not taken. it was drawn in the same direction as V1. But l have I have seen in oiher other books that lhey have drawn E1 in 1he reverse direction as -E1. Both are seemed to bc correct 'Nith respcctive logic. That actually made the confusion, which convention to be followed. Then in one NPTEL lecture from lIT KHAPAGPUR, the profossor told that actually both phasor diagram correct. Actually 'Nhen the transformer parameters calculation is concerned from the phasor, both the phasor diaqram vvill produce same result. So any convention can be followed. I can send you the link of the nplel lecture if you want. i have to fmd it in the KZbin. it id available there. by the way, recently we have come up with a comprehensive video lecture series on power electronics. you can watch that if you want.
@053_abdulhannanbhat8
@053_abdulhannanbhat8 3 жыл бұрын
@@jayabratamaity6889 yes plz send the link
@tibenkanahafizu8926
@tibenkanahafizu8926 Жыл бұрын
Halo help me with generator single phase diagram
@abigt282
@abigt282 5 жыл бұрын
wrong, you have not explained why V1 = - E1+I1R1 +JI1X1, primary side
@akhilbanoth866
@akhilbanoth866 5 жыл бұрын
Yes bro
@ARGAMING_69
@ARGAMING_69 5 жыл бұрын
That is because conventionally we take - to + as negative,in E1 current is flowing from + to - ,you know that when we apply kvl we have to assign signs ,if you take the direction of current as clockwise then the equation that was in this video will be formed and you will get the answer you are asking him for.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you very much tor raising the question. actually i had this doubt also. i researched a lot. in m g say's book i have seen -E1 is not taken. it was drawn in the same direction as V1. But l have I have seen in oiher other books that lhey have drawn E1 in 1he reverse direction as -E1. Both are seemed to bc correct 'Nith respcctive logic. That actually made the confusion, which convention to be followed. Then in one NPTEL lecture from lIT KHAPAGPUR, the profossor told that actually both phasor diagram correct. Actually 'Nhen the transformer parameters calculation is concerned from the phasor, both the phasor diaqram vvill produce same result. So any convention can be followed. I can send you the link of the nplel lecture if you want. i have to fmd it in the KZbin. it id available there. by the way, recently we have come up with a comprehensive video lecture series on power electronics. you can watch that if you want.
@chittimurihimajarakhi2208
@chittimurihimajarakhi2208 4 жыл бұрын
@@jayabratamaity6889 keep me that Nptel video lecture link sir
@abigt282
@abigt282 3 жыл бұрын
@@jayabratamaity6889 ...please send the link...thanks in advance
@mahmmadhusen6794
@mahmmadhusen6794 5 жыл бұрын
Exillient
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you dear. recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@chamanyadu4117
@chamanyadu4117 Жыл бұрын
Leading me btao na sir
@circuitabc4527
@circuitabc4527 5 жыл бұрын
Nice
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you dear. recently we have come up with a comprehensive video lecture series on power electronics. u can watch them too.
@rutvikpawale2462
@rutvikpawale2462 3 жыл бұрын
@1:36 🤣🤣
@hriday.ki.dhadkan
@hriday.ki.dhadkan 5 жыл бұрын
Why -E1 ?, as V1 = E1 + I1R1 + I1X1.
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
spandan, thank you very much for raising the question. actually i had this doubt also. i researched a lot. in m g say's book i have seen -E1 is not taken. it was drawn in the same direction as V1. But I have I have seen in other other books that they have drawn E1 in the reverse direction as -E1. Both are seemed to be correct with respective logic. That actually made the confusion, which convention to be followed. Then in one NPTEL lecture from IIT KHARAGPUR, the profossor told that actually both phasor diagram correct. Actually when the transformer parameters calculation is concerned from the phasor, both the phasor diagram will produce same result. So any convention can be followed. I can send you the link of the nptel lecture if you want. i have to find it in the KZbin. it id available there. by the way, recently we have come up with a comprehensive video lecture series on power electronics. you can watch that if you want. Once again, Thank You very much.
@KaushalRaj-m2l
@KaushalRaj-m2l 7 ай бұрын
Conclusion after watching this.... : cheat bna lo
@htp2319
@htp2319 4 жыл бұрын
THANKS
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
welcome tanvir
@boiniswaruparani9904
@boiniswaruparani9904 5 жыл бұрын
Why i2 is lagging current
@ARGAMING_69
@ARGAMING_69 5 жыл бұрын
it depends on the type of load if the load in inductive it will lag ,for capacitive load it will lead voltage by 90 deg ,and in pure resistive case it will be in phase
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
AR GAMING gave the correct answer. anyway boini... recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@rudrakshadixit912
@rudrakshadixit912 Жыл бұрын
iron loss is not hysteresis or eddy current loss it is the I^2R loss occuring as heat
@PiyushKumar-dl6pm
@PiyushKumar-dl6pm 5 жыл бұрын
Hindi kaha mile ga
@bibekanandanayak8839
@bibekanandanayak8839 5 жыл бұрын
Bhai mila to batana
@PiyushKumar-dl6pm
@PiyushKumar-dl6pm 5 жыл бұрын
@@bibekanandanayak8839 kya batau
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
actually my hindi is not so well. thats why i made in English. i wl learn better and provide in hindi also. by da way recently we have come up with a comprehensive video lecture series on power electronics. u can watch them too.
@rutvikpawale2462
@rutvikpawale2462 3 жыл бұрын
Guys "OA"means way Don't get confuse🤣🤣🤣
@technoboy8314
@technoboy8314 2 жыл бұрын
Kuch ache se explain Karo bro.... Thoda acha study karao
@explorer5941
@explorer5941 2 жыл бұрын
hindi m bataya kro
@bibekanandanayak8839
@bibekanandanayak8839 5 жыл бұрын
Hindi re sir
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
okay bibeka. i wl try to do that. by da way recently we have come up with a comprehensive video lecture series on power electronics. please watch them too.
@mohan_pyaare
@mohan_pyaare 5 жыл бұрын
Not explained well
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
thank you mohan. next time i will make it better. by da way recently we have added a new comprehensive video lecture series on power electronics. please watch them too and give your feedback.
@wellingtonpazmino58
@wellingtonpazmino58 3 жыл бұрын
Hi, Could you explain me Why E1 is -E1?
@shwetasawant6748
@shwetasawant6748 4 жыл бұрын
Thank u so much sir
@jayabratamaity6889
@jayabratamaity6889 4 жыл бұрын
you're most welcome sweta. a comprehensive video lecture series on power electronics has been added to the channel recently. u can watch that too.
@keshav479
@keshav479 Жыл бұрын
Thank you so much sir
PHASOR DIAGRAM ( INDUCTIVE LOAD) FOR A SINGLE PHASE TRANSFORMER
11:38
Непосредственно Каха: сумка
0:53
К-Media
Рет қаралды 12 МЛН
«Жат бауыр» телехикаясы І 26-бөлім
52:18
Qazaqstan TV / Қазақстан Ұлттық Арнасы
Рет қаралды 434 М.
JISOO - ‘꽃(FLOWER)’ M/V
3:05
BLACKPINK
Рет қаралды 137 МЛН
Phasor Diagram of Practical (Real) Transformer on Load (8)
19:55
Learn Electrical Yourself
Рет қаралды 12 М.
EMF Equation of Transformer & Transformation Ratio
8:10
Electrical Deck
Рет қаралды 108 М.
Stop Wasting Money on New Batteries! Restore Old AA Batteries Today!
18:17
How does a Transformer work ?
5:48
Sabins Civil Engineering
Рет қаралды 10 МЛН
7 Outside The Box Puzzles
12:16
MindYourDecisions
Рет қаралды 292 М.
Transformer On Load - Operation and Phasor Diagram | Electrical Deck
4:27
SINGLE PHASE TRANSFORMER : EQUIVALENT CIRCUIT AND WORKING
8:39
Xplanator
Рет қаралды 117 М.
How to draw a phasor diagram. RL, RC & RLC Series AC Circuits
15:32
Elearntrical Engineering
Рет қаралды 506
Непосредственно Каха: сумка
0:53
К-Media
Рет қаралды 12 МЛН