Great video and very well explained in a short time, not making it boring at all. The only thing I have a comment and felt there was a mistake was the current equations shown in the figure at 3:21. The thing you have done is that ground fault current is divided in each tower, and flows up to be added in each overhead earthwire (OHEW) span, and the final I = I1+I2+I3. This means the OHEW span farthest from the fault span has the maximum fault current. But its just opposite of that. IEEE 367 states that "Near the fault, overhead ground wire may carry up to 80% of the fault current, which is then gradually dissipated into the earth at each successive tower or pole." So actually, the earthwire fault current gets divided into the earth in every tower and ground portion of the fault current gets added up as they flow to the remote substation. The first overhead earth wire section will bear the most current and will decrease down the transmission line section far from the fault. This is very well explained in the book "Power System Modelling and Fault Analysis, Theory and Practice" by Prof. Dr. Nasser Tleis, chapter 11th for the second edition.
Probably the best video i came across so far regarding concept of step and touch voltages... Lovely Explanation... Subscribed to your channel....eagerly waiting for part 2
Hi sir it was really nice and worth watching complete video. I have one doubt that, can we reduce the conductor size of earth grid to save cost of it by introducing NGR (neutral grounding resistor)
Thank you sir.. I have two questions.. 1. Why all fault current return from transformer neutral 2. If transformer is delta-delta then how fault current behave
Excellent Video but Current I and I4 distributed in ground grid instead flow in X'Mer netural as the current flow in low resistive path i.e ground grid may right or wrong sir
Touch voltage. Because that is difficult to maintain within the limit. I should say touch voltage creates more nuisance than step voltage for designer. But if you consider hazard both are dangerous.
Our 15/110 KV step up transformer input cables screen shield is connected to main earthing system . Day before we have measured by current multi meter and found that 20 Amp current flowing from earthing cable . i know for the induction some amount of the current should flow from earthing system but i don`t know how much is acceptable . If you know any legal information please let me know.Thanks for advance
@@electricaltechnologyandind5335 if any leakage in equipment, leakage voltage will flow to earth. Then how to measure how much voltage is flow to earth
Hey, would you be able to please provide me with your contact info. It would be much appreciated if we can chat over whatsapp as this topic has bothered me for a long time and hoping you can help me solidify my understanding.
Great video and very well explained in a short time, not making it boring at all.
The only thing I have a comment and felt there was a mistake was the current equations shown in the figure at 3:21.
The thing you have done is that ground fault current is divided in each tower, and flows up to be added in each overhead earthwire (OHEW) span, and the final I = I1+I2+I3. This means the OHEW span farthest from the fault span has the maximum fault current. But its just opposite of that. IEEE 367 states that "Near the fault, overhead ground wire may carry up to 80% of the fault current, which is then gradually dissipated into the earth at each successive tower or pole."
So actually, the earthwire fault current gets divided into the earth in every tower and ground portion of the fault current gets added up as they flow to the remote substation. The first overhead earth wire section will bear the most current and will decrease down the transmission line section far from the fault.
This is very well explained in the book "Power System Modelling and Fault Analysis, Theory and Practice" by Prof. Dr. Nasser Tleis, chapter 11th for the second edition.
Thank you. I am also get to know many thing. Thanks a lot
Thanks Sagun, i immediately downloaded this book. Its great
OHE of the outgoing line should separated from power station line gantry by using a disc insulator, is that right?
Very nice explanation 👍
Probably the best video i came across so far regarding concept of step and touch voltages... Lovely Explanation... Subscribed to your channel....eagerly waiting for part 2
Thanks for sharing your valuable knowledge, you have explained the complicated concept very easily. GOD bless you.
Good upcoming video awaited
Thank you for sharing this knowledge...
Hi sir it was really nice and worth watching complete video.
I have one doubt that, can we reduce the conductor size of earth grid to save cost of it by introducing NGR (neutral grounding resistor)
awesome ... fantastic
Perfect explanation diagrams
Thank you sir..
I have two questions..
1. Why all fault current return from transformer neutral
2. If transformer is delta-delta then how fault current behave
WHAT EXACTLY IAM LOOKING FOR INFORMATION I GOT IT SIR. WELL DONE . HOPE U DO MORE VIDEOS LIKE DISTANCE PROTECTION AND CARRIER SCHEMES
i have plan for many videos. lets see how many i can manage to shoot
GOOD GOING SIR
thank you so much for sharing valuable information....i request you to please upload design calculation part as you said in video...
Bro you are too good...
good work!
Sir, I have one question, Why is plant grounding not based on step and touch voltage calculations? Why just substations/switchyards(IEEE-80)?
Thanks....
Part 2 pls upload
Thanks for the video. Please explain 1 calculation with an example.
Good
Excellent Video but Current I and I4 distributed in ground grid instead flow in X'Mer netural as the current flow in low resistive path i.e ground grid may right or wrong sir
Ultimately the entire current will return to transformer neutral.
Hello sir,
Great explanation.
Please share the calculation example also.
I often looked up at this shield wire wondering what it is. A single wire above 3 phase.
is there any other video for calculating GPR and Grounding? Can you pls share the link?
Where can I found part 2 of this video
Sir which voltage is more dangerous touch or step?
Touch voltage. Because that is difficult to maintain within the limit. I should say touch voltage creates more nuisance than step voltage for designer. But if you consider hazard both are dangerous.
🔥🙏
Our 15/110 KV step up transformer input cables screen shield is connected to main earthing system . Day before we have measured by current multi meter and found that 20 Amp current flowing from earthing cable . i know for the induction some amount of the current should flow from earthing system but i don`t know how much is acceptable . If you know any legal information please let me know.Thanks for advance
Could you share the sld @
electricaltechnology04@gmail.com?
I can try to help
How ever there is no such limit of current as far i am concerned
@@electricaltechnologyandind5335 if any leakage in equipment, leakage voltage will flow to earth. Then how to measure how much voltage is flow to earth
can someone pls share link to part 2 of this video
Where is part 2 for calculation??
Can't find the 2nd part
waiting for your videos sir. specific topics are DISTANCE PROTECTION , BUS BAR PROTECTION CENTRAILISED AND DECENTRALISED SCHEMES,
it will take time....
OK SIR
Hey, would you be able to please provide me with your contact info. It would be much appreciated if we can chat over whatsapp as this topic has bothered me for a long time and hoping you can help me solidify my understanding.