Analysis of L-G Fault (Single line-to-ground fault)

[@DrAfrozAlam]

Download Fault Analysis handwritten lecture notes (pdf) using the following links: drive.google.com/file/d/18Zvgdi3YD6iAIkWJwz5-s7dVHRgM6lwZ/view?usp=sharing drive.google.com/file/d/1sfMf8BDsZ1BlKoehLLkokwizgtWHIbrr/view?usp=sharing drive.google.com/file/d/1eYOtrSzN7VwsqiLwjnrJ79BQd2LcE_Vy/view?usp=sharing

[@vishalkumarverma7034]

Sir you came to my college for viva

[@DrAfrozAlam]

Which college?

[@smartengineeringeee4990]

Alhamdulillah ❤ Thank you Sir, Take love from Bangladesh. 🇧🇩

[@neminathnarule2257]

I don't have words for ur appreciation sir.. Really this is a best fault analysis lecture I have seen ever ..lots of thanks and May God shower his choicest blessings on u sir👌🙏👏👏..all concepts get cleared. tq sir

[@Tsxvb108]

sir your videos are great. I understood power systems through your lectures. i passed power systems with the help of your lectures. Thank you so much sir. GOD bless you

[@surya-pc7nx]

Great sir excellent explanation. Though I am power engineer when I got any issues regarding power system simply I will watch your videos and under stood the problem.

[@MdHossain-qh3mn]

Sir, Assalamualaikum. Thank you very much for your easy explanation in these lecture. I hope that Allah might bless you in both life.

[@DrAfrozAlam]

Wa Alaikum Assalam, Jazakallah

[@kumaripuja2057]

very useful lecture sir....thanku very much for making things simple...wonderful lecture

[@dvoorganisation459]

Thank you Sir ou are. Very good teacher May Almighty give you a long and lengthy life

[@DrAfrozAlam]

Thanks a lot dear

[@jigmechogyal4435]

Your explanations are superb sir. I have learned a lot from you. Thank you so much.

[@DrAfrozAlam]

You are most welcome Jigme

[@emotionalpromax498]

Sir, we are so blessed to have you❤🥺 Thank you so much❤😊

[@theophilwilliam2879]

thanks sir, am gaining a lot from you

[@DrAfrozAlam]

You are most welcome Theophil William.

[@mobeenhafeez8620]

Thankyou so much sir for uploading these lectures. This helped me alot

[@DrAfrozAlam]

Most welcome Mobeen

[@Binilbabu45]

Super Lecture 👌👌.. Thanks a lot for uploading these videos!!

[@surendrakverma555]

Very Good lecture Sir. Thanks and Regards

[@shahid5993]

بہت شاندار ....

[@HarpreetSingh-xp3ss]

I am a student at one of the top universities and I can say these are really detailed lectures for basics.

[@DrAfrozAlam]

Thank you Harpreet.

[@HarpreetSingh-xp3ss]

@@DrAfrozAlam I should say "Thank You" for such great lectures, they help me a lot to cover per-requisites for Master's.

[@vishalkumarverma7034]

Kaun si university?

[@HarpreetSingh-xp3ss]

@@vishalkumarverma7034 Polimi

[@wahedimtiazsheetal7094]

Thank you Sir for this conceptual tutorial.

[@godknowsabbey6509]

Great work Dr, I really appreciate.

[@surendrakverma555]

Thanks a lot Sir for very useful lecture Regards 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@Aspirant-lp8cw]

Great lecture Sir. Thank you.

[@ntwananotyron7197]

May God bless you sir! 🇿🇦🇿🇦🇿🇦🇿🇦

[@sohailjanjua123]

Salam, Mashallah excellent lecture . Thanks sohail 62 year old man from USA

[@DrAfrozAlam]

Wa Alaikum Assalam Sohail sir. I am thankful to you for your kind words.

[@jakirhossain7606]

Very good these lectures

[@adityajain2502]

Wonderful lectures.

[@DrAfrozAlam]

Thank you Aditya

[@transientmatter6088]

For sure ...you will be celebrity professor soon...

[@DrAfrozAlam]

Thank you for this appreciation

[@unclasses8689]

Dear Sir please upload lectures on power system protection if you had taken classes on this topic.

[@thinkwithimtiaz]

Sir, we have taken all the sequences in one loop, assuming that sum of all sequence voltages in one phase is zero...But if there is a fault impedance, can we still operate on this assumption cause now the sum of voltages are not zero.....and Again Thanks a lot sir, for these excellent lectures...

[@shariefmahaboob2363]

Sir really soooper sir 👌👏👏

[@DrAfrozAlam]

Thank you Sharief Mahaboob.

[@gudesagar5522]

Nice explanation 👌 sir thanku

[@DrAfrozAlam]

Most welcome

[@rang.O]

best lactures

[@Manish-fo4gj]

Excellent lecture

[@DrAfrozAlam]

Thank you Manish

[@zaheersuhabuth2677]

Kya baat hai Sir

[@rambinaykumar4437]

Sir u r God. For us .No one can teach like u in free of cost .If u upload direction relay n nondirectional relay n many types it will be helpful for us

[@DrAfrozAlam]

Thank you Ram Binay Kumar for the comment. The GOD is one and only one, we all are creatures.

[@yard1917]

acha bolaa sir excellent

[@DrAfrozAlam]

Thank you Mastan Basha

[@coam3708]

very well explained ...........however would like to see If in kA as it allows a value to been seen

[@bari5908]

Thanks

[@bari5908]

Happy to learn.

[@karbonaterol9751]

What would be the effect of load current on ground current if it was a loaded system?

[@udaykumarnalla1737]

Exlent class sir

[@DrAfrozAlam]

Thank you

[@hiteshkumarsingh3075]

Sir while calculating line voltage vab, when we have to do root3 times vag and when we have to do vag-vbg.?

[@electricnewbie]

good job sir

[@Whynot-mrm]

Thanks,for this class! I have a question, How would be the analysis if Iy and Ib were not zero? if the system was loaded at t=0? Could somebody explain me that?

[@Imran52Feb]

Sir : Good Evening My Question : If we connect the Back-Up generator's neutral and External normal supply Distribution Transformer's neutral to the same earth pit solidly grounded what will be the implication? operation of generator will be only when mains supply fails and isolation between Gen. and the Normal supply will be by a manual changeover switch. Your teaching method reminds me of my best teachers. Thanks

[@DrAfrozAlam]

Thank you for the comment. As per my understanding, there is no harm in connecting the two neutrals. Your question indicates that you are an industrial expert. I will be happy if you can elaborate some practical aspects of the above connection.

[@Imran52Feb]

@@DrAfrozAlam Assalamalekum Dr Saheb. Thank you very much for your quick reply . Actually I worked for BHEL India and Siemens Ltd. India mostly in the field of Control and Relay Panel Designs and not in erection and commissioning area. This question just occured to me while listening to your lecture. Thanks again sir

[@DrAfrozAlam]

Wa Alaikum Assalam Imran sb. Glad to know about you.

[@shoaibmaqsood6605]

@@DrAfrozAlam Assalamo Alaiqum sir I am from Pakistan. sir here in Pakistan , in case of large load we do not connect transform and generator neutral together. we use common neutral only for small load. I donot know why is this?? as you say there is no issue to connect both together.

[@DrAfrozAlam]

@Shoaib Maqsood, Wa Alaikum Assalam, When the two neutrals are connected, zero sequence current gets its path which flows during unbalanced loading. In distribution system, loads in three phases are generally not exactly balanced. However, in previous question, you may note that generator (backup generator) only operates when main supply fails and there is isolation between the two by manual changeover switch.

[@abdulwahabqureshi1628]

Sir why have you taken Vr = 0 because in J. B. GUPTA Vr is taken as Vr=IaZf can you please guide

[@shekhsamir2116]

Nice

[@DrAfrozAlam]

Thank you Shekh Samir

[@DrAfrozAlam]

@Balaji Inukonda You can use Hadi Saadat or Kothari Nagrath

[@prarambhiksur2104]

Sir could you please explain my doubt Before fault is Vr=Er or Vr=Er/√3 Thank you for the great explanation of the fault analysis.

[@DrAfrozAlam]

Before fault, Vr=Er as Er is EMF induced in R-phase i.e. Er is phase voltage (not line voltage). We have already defined it in the video lecture. See at time 3:28

[@prarambhiksur2104]

Yes sir I got it Thank you sir.

[@prarambhiksur2104]

Sir one more thing why are we considering that The prefault conditions to be no load because in most of the practical cases it is likely that the system will be loaded while fault occurs?

[@DrAfrozAlam]

It is an assumption to simplify calculation without affecting it's accuracy at large.

[@prarambhiksur2104]

@@DrAfrozAlam Okay sir thanks once again.

[@MdKawsar-qu8ek]

Assalamualykum sir..I have one question.. Why don't we find Er in Negative sequence

[@DrAfrozAlam]

Wa Alaikum Assalam. As generated EMFs are always balanced. For more information, you may watch following video lectures: kzbin.info/www/bejne/gJaoZZSnl62emLM kzbin.info/www/bejne/p5bYZqOGYqlrepY

[@kishorj8407]

Sir this is KISHOR ... just need a clarification unsymmetrical fault occur as L-G , L-L, LL-G ... But.. OPENING OF ONE OR TWO CONDUCTORS is a symmetrical fault only no??? But in exam they included this opening of one or two conductors is also as an unsymmetrical fault... Kindly please clarify my doubt sir🙏🙏🙏🙏

[@DrAfrozAlam]

kzbin.info/www/bejne/Y4mco517j9t3jsk

[@ashishgarg3924]

sir i have one Doubt . Can L-G Fault occur in DC Supply?

[@DrAfrozAlam]

Yes, such fault is known as DC ground fault.

[@rathod5610]

What is the analysis of topic is best hyy power lectures on this student is feeling is better understend of aftre is coming soon this har

[@kingnephilim7263]

assaalamu alaikum. I want to know what will happen to the total fault current , when the fault occurs at Y phase. thanks.

[@DrAfrozAlam]

Wa Alaikum Assalam. You will find similar expression of fault current (Just interchange R with Y everywhere in the derivation).

[@kingnephilim7263]

@@DrAfrozAlam thank you so much sir.

[@amansanatani6393]

Sir fault impedance ma positive sequence current bhi to flow karega..As fault current is the sum of all three

[@amansanatani6393]

So why this impedance is only in zero sequence network

[@DrAfrozAlam]

No, positive sequence current will not flow through fault impedance as algebraic sum of the three positive sequence currents (IR1, IY1 and IB1) is zero.

[@amansanatani6393]

@@DrAfrozAlam but sir IF is equal to IR0 +IR1+IR2 .This mean IR1 is flow in this part

[@DrAfrozAlam]

@@amansanatani6393 Yes, IF = IR =IR1+IR2+IR0 = 3IR0 as IR1=IR2=IR0

[@DrAfrozAlam]

@Aman Sanatani IR1 will not flow through fault impedance, it is basically IR0 which is equal to IR1 (in case of L-G Fault).

[@Thumbsup001]

What is Ir,Ir1 and Ir2

[@DrAfrozAlam]

kzbin.info/www/bejne/o4SngJmdqZyknKs

[@anadisings]

🧡🚩

[@muhammadarif9254]

Ok....

[@amitbikramapattanaik648]

But if zn=0 then xn must be 0 ????

[@DrAfrozAlam]

Of course as Zn = Rn + j Xn

[@yiagnigniibrahim448]

am i the only one suffering from that chalk??

[@DrAfrozAlam]

Because of this, I left using chalk. Now I use board marker ink pen.

[@selviselvi8303]

🙏🙏🙏💐💐💐🌹🌹🌹👍👍👍🙏