Differential protection

[@TheNameWithNoNumbers]

Stephen's knowledge, delivery, and production quality are superb.

[@Electricalsteve]

Much appreciated!

[@Ryan-nh8ef]

These videos on your channel are amazing, I can’t believe its taken so long to find them! Outstanding effort and the information is unreal. This will help me in my future development and understanding of the theory behind the UK network. I’m hoping to gain a trainee engineer position, so this information is perfect!

[@Electricalsteve]

thanks for the kind feedback Ryan!!

[@michaelkolade9102]

Very brief and straight to the point. Thanks

[@estudent-vm7fi]

Man, you are good! Please understand that, you are legend. Just the way you start from the very bottom and cover everything up to the top is the only way I can understand.

[@Electricalsteve]

Am glad you found them useful!!

[@mayito714]

I think I would have uderstood this better with a simple single Station Transformer. The later single buss example was the only one I grasped.

[@mohamedibrahimhussein3007]

Thanks, it is perfect explanation and I appreciate ur skill

[@AminulIslam-we3kd]

Thanks for the post of your videos regarding differential relays. Please explain how calculate matching transformer ratings for 10 MVA transformer connected to 66/11 line.CTs of 200/5 amp and 600/5amp in high side and low side respectively.

[@Electricalsteve]

Hi Aminul, this subject is not covered on this video steve

[@kiamick]

Stephen you videos are brilliant. I was following this one quite well up until you had an in-zone fault on your feeder that's fed from both ends A & B. The current rises on both CTs as expected and is balanced according to your ammeter animations (2000A). Yet it still trips both breakers on imbalance. It has something to do with the backwards current i presume but don't quite understand why. Can CTs sense direction?

[@Electricalsteve]

Hi Michael, The CT will measure current in both directions, the relay is set up to operate when the current is in either the forward or reverse direction to make it possible to identify the fault locations, please refer to the full Udemy protection course for details. Regards steve

[@kiamick]

@@Electricalsteve Steve thanks for the reply. I purchased about 70 quids worth of courses a few weeks ago. I think all of them except 1 that you had available. I would really love to have the option to ask you more questions as and when they arise throughout this course. Can I leave you my email and you send me a message so there is always the option for help? I would really appreciate it and I'll tell you more about what I do for a living and how your knowledge will help me develop. Thank you

[@ibrahimhassame8859]

Good

[@Boldaslove71]

I wonder if it is an ANSI vs. IEC thing, but normally in ANSI we would have the CT's on the opposite side of the breakers, as shown. This was the breakers at each end are protected by the differential protection. In the scheme as shown, either breaker could fail and would need some other protection scheme to sense the fault.

[@Electricalsteve]

Hi, it’s not really an ANSI/IEC conflict, most utilities only have one set of current transformers on the line side now to save money and use other protection functions to detect a fault in between the CT / circuit breaker ( short stub fault ). Steve

[@Boldaslove71]

@@Electricalsteve Maybe it's a regional thing. I commission HV substations, including the apparatus outside and the protection systems inside the control house. Our standard new dead tank circuit breakers have a total of 18 CT's per breaker. For a line breaker the bus side CT's are used for primary and secondary line protection and the line side CT's are for primary / secondary bus protection. Having the diff CT's on line side ensures the breaker itself is covered in the diff scheme. In a ring or breaker and a half scheme, it may be a little different. One last set of CT's may be used for breaker failure protection and the last may be for revenue metering. We have older installations that don't have as many CT's (we call CT deficient), but that can cause issues down the line - shared CT circuits and someone does maintenance test with doble -plugs paddle in while connected to doble and shorts diff relay and a nuisance trip. I believe for the relative low cost of additional CT's on a dead tank, many utilities choose to have the extra CT's for flexibility and ease of wiring and maintenance. Digital relays also help quite a bit if sharing CT's as the polarity can be adjusted internally in the relay for compensate.

[@a.b.m.mesbahuddinahmed3006]

Very good explanation with clear concepts.

[@Electricalsteve]

Glad you liked it

[@billyambotane5761]

May I be enlightened of a high line fault current not being detected by relay to send trip signal to line cb to operate however sensed by generator differential protection and trip the generators.I presume the line line distance protection requires to be reset cater for large fault. currents.

[@jamesbarber8012]

Hi Stephen, great videos, well presented and spoken. QQ, do you have any voucher codes so i can start doing these in full on udemy?

[@Electricalsteve]

Hi, Go to the Udemy website, search for courses under my name ( Stephen brooks ) & use the voucher code WERD1001 to get them for $9.99, vouchers expire in 5 days. Regards Stephen Brooks

[@coltonbutts96]

Excellent video!

[@Electricalsteve]

Hi, Go to the Udemy website, search for courses under my name ( Stephen brooks ) & use the voucher code WERD1001 to get them for $9.99, vouchers expire in 5 days. Regards Stephen Brooks

[@ajugarasiya7546]

Sir transformer protection video please

[@atanquerel]

Really useful video thanks

[@saeedahmed4651]

amazing videos...

[@Electricalsteve]

Glad you like them!

[@farzanals9701]

Hai sir, can you please make the vedio lecture on frame leakage protection of busbars & carrier current protection of transmission lines(power system protection) as soon as possible sir. Thanking you sir.

[@Electricalsteve]

Thanks for the suggestions...will see what I can do. steve

[@SolarEMPSOLUTIONS]

Ur guide Great 👍

[@velmurugant2653]

Useful video

[@SolarEMPSOLUTIONS]

Very thankful

[@ELECTRICALFUNDAZ]

Hi sir. Which software you use for making such videos?

[@Electricalsteve]

Hi, Go to the Udemy website, search for courses under my name ( Stephen brooks ) & use the voucher code WETT1001 to get them for $9.99 Regards Stephen Brooks

[@aryanraiqal2294]

sir can u explain by video what happen if we use different class for overhead line..substation A using CT class X..but another remote end substation using CT class 5P20..what happen if fault occured..??

[@Electricalsteve]

Hi, The 5P20 CT’s will be less accurate than the class X CT’s, this will become clear if you have a high current fault and the relays at the two ends will show different current levels, this difference may in incorrectly identify a fault on the line being protected. Regards Steve

[@aryanraiqal2294]

@@Electricalsteve tq steve..👍

[@AhmedKhan-cm8kr]

Very good explained

[@Electricalsteve]

Glad it was helpful!

[@Ranjithsriram]

Thank u sir...I can imagine it

[@youssefayman7513]

Thank u ❤❤❤

[@Electricalsteve]

Always welcome

[@subhambhardwaj7329]

Sir please may i know why there was no damage to the equipment in through fault? as an overcurrent is already passing through it

[@Electricalsteve]

Hi Subham, Equipment used on electrical networks is designed to carry fault current for a certain time period, normally 1 second or 3 second dependant on the application. This allows time for the protection systems to detect the fault and open the circuit breakers, clearing the fault from the network steve

[@VinodPrajapati-sb4ho]

Thank you sir 😊

[@Electricalsteve]

Most welcome

[@VinodPrajapati-sb4ho]

Sir please Explain - Schneider micom relay P125 P222 All functions...

[@Electricalsteve]

Hi Vinod, the full protection courses on Udemy explain all of the functions in detail steve

[@VinodPrajapati-sb4ho]

@@Electricalsteve ok sir thank you Please suggest link

[@Electricalsteve]

Hi, Go to the Udemy website, search for courses under my name ( Stephen brooks ) & use the voucher code WERD1001 to get them for $9.99, vouchers expire in 5 days. Regards Stephen Brooks

[@lalitjoshi7152]

Exact explanation... Thankyou

[@Electricalsteve]

Hi, Go to the Udemy website, search for courses under my name ( Stephen brooks ) & use the voucher code WERD1001 to get them for $9.99, vouchers expire in 5 days. Regards Stephen Brooks

[@surendrakverma555]

Very good

[@Electricalsteve]

Thanks

[@jungwanson3166]

Excellent

[@Electricalsteve]

Thanks

[@farmaz7667]

Good explaine.

[@user-tp2th9xi2r]

Hi

[@user-nr5qc6rq1z]

Thanks

[@Electricalsteve]

Welcome

[@electricaltech4u45]

V nice bro

[@noicyop2142]

Ohhhh

[@Electricalsteve]

Thanks!!

[@mahingajjar6059]

thanks sir

[@Electricalsteve]

Thanks!!