You are great Sir, wish I had you as my electrical protection lecturer during my varsity years. You effortlessly make concepts which used to crack my brain look easy. Im humbled!!
your videos are very informative and useful, i am waiting for your next video on electromagnetic differential relays. thanks for your time and effort, really appreciate it.
Bro is the value of Id which is 0.15 amp. in this case is fed by us in the numerical relays,plz reply bro,I m confussed for that,does we have to feed this pick up value of Id in the numerical relays,plz reply bro
I have a question. that I hope you will answer for me. does a 3-phase transformer see 180 or 150hz or does it not work that way? the reason I ask. is if you rewound the core as a single phase. would it be optimised for more in the 150-180 hz frequency ? doesn't the laminations need to be thinner on 3-phase transformers? thanks . I hope you can help me with this.
Bro I have doubt,in CT secondary connection you are showing mirror image in that connection differential relay connected between R and star point and Delta R phase,in star connection current will flow bcoz of there 2 point available but in Delta only one connection are showing,how current will flow in that one connection,plz give solution
question: trying to achieve +/- 5% of 230v. readings are L1 to L2= 247 L1 to Ground= 122 L2 to L3= 248 L2 to ground=214 L1 to L3= 247 L3 to Ground= 124 I was informed to use 2 buck and boost transformers 500SV43B 0.50kva, what is the wire make up with high leg?
Really the video will be neat but in k2 formula you need to change that's no secondary side CT ratio its primary side CT RATIO divided by full load current
sir , can u clarify the CT connection ?...while using the microprocessor based relays the CT connections is star, but without micro processor based relay it was different connections like one side delta and other side star?
Transformer has two winding, mostly one connected in star and the other connected in delta. when there is an unbalance in the load there will be flow of zero-sequence current in the lines of star connected side, but there will be no flow of 0 seq current in the lines of delta connected side, thus the differential relay might operate during unbalance conditions, in order to avoid it we use 0 sequence filtering in the star connected side. For generators there is no need to use 0 seq filter. we also use 2nd harmonic blocking in transformers to prevent unwanted tripping of differential relay during magnetizing inrush. for generators we don't need to use 2nd harmonic blocking.
Hi friend thanks for your nice work. I have a doubt, Why did you marking Y phase current value as i @(240) degree. ? phase angle difference between each phase is 120 degree. then R phase= I @(0) Y phase = I @ (120) B phase = I @ (240) Is it right or not??? But you are mentioned always Y phase is I @(240) ???
PLOT FOUR QUADRANT THEN DRAW THESE PHASES. AT 120 DEGREE IF YOU PLOT YELLOW PHASE THEN DURING ROTATION OF PHASES IT WILL BE ACB INSTEAD OF ABC. SO THATS WHY WE TAKE ANGLE FOR YELLOW 240 WHICH IS IN THIRD QUADRANT
For the INDUCTION MOTORS protection,we have to use the DOL starter,if the INDUCTION MOTOR is up to 5 hp,& for the protection of INDUCTION MOTORS more than 5 hp we have to use the star Delta starter or soft starter,WHILE THE BEST WAY IS TO USE A VFD(VARIABLE FREQUENCY DRIVE),THIS VFD NOT ONLY PROTECTS THE INDUCTION MOTORS,BUT ALSO WE CAN CHANGE THE SPEED OF INDUCTION MOTORS,BY CHANGING THE FREQUENCY IN THE VFD.😊😊
You are great Sir, wish I had you as my electrical protection lecturer during my varsity years. You effortlessly make concepts which used to crack my brain look easy. Im humbled!!
Really great understanding
Explained very well
Thanks sir. Rarely found explanation for CT connections -Thumb rule .
Very nice 👍 and excellent work....go head
your videos are very informative and useful, i am waiting for your next video on electromagnetic differential relays.
thanks for your time and effort, really appreciate it.
Well done .Excellent presentation.
Excellent , very smooth presentation. thanks.
Detailed explanation 👏
Very very nice .we understood very much. thanks
Very good explanation and thank lot for your effort.
Great superb ji.
Ur great boss..
Thank u so much . Very usefull..
Very good video . thanks
Excellent explanation!
Good job u did ,the 2nd vedio u referenced is not available,plz share link of that
Wonderful Explanation.. Expecting clearly explained video of Restraining characterstics/bias and other inhibit function protn in detail for trafos..
excellent video!
Excellent.......
Sir u gave the excellent example... Im 100% satisfied.... Can u explain it for electromechanical differential relay.... Please
Bro is the value of Id which is 0.15 amp. in this case is fed by us in the numerical relays,plz reply bro,I m confussed for that,does we have to feed this pick up value of Id in the numerical relays,plz reply bro
VERY GOOD SIR
very good and informative vedio . would you please make a lecture on distance relays .and where i found all vedios uploaded on your channel.
Thanks keep good job
Sir made some vdos regarding Relay coordination and fault calculation
When will you be putting up the diff protection using electromechanical relays?
I have a question. that I hope you will answer for me. does a 3-phase transformer see 180 or 150hz or does it not work that way? the reason I ask. is if you rewound the core as a single phase. would it be optimised for more in the 150-180 hz frequency ? doesn't the laminations need to be thinner on 3-phase transformers? thanks . I hope you can help me with this.
Bro I have doubt,in CT secondary connection you are showing mirror image in that connection differential relay connected between R and star point and Delta R phase,in star connection current will flow bcoz of there 2 point available but in Delta only one connection are showing,how current will flow in that one connection,plz give solution
question: trying to achieve +/- 5% of 230v. readings are
L1 to L2= 247
L1 to Ground= 122
L2 to L3= 248
L2 to ground=214
L1 to L3= 247
L3 to Ground= 124
I was informed to use 2 buck and boost transformers 500SV43B 0.50kva, what is the wire make up with high leg?
Polarity is missed, you should show it, rest assured it's a good explanation
Nice video sir...can you explain setting consideration in first second slope, after minimum diffrential pick up
Is the pick up value of Id which is 0.15 amp. in this case is fed by us in the numerical relays,plz reply bro
Is the pick up value of Id which is 0.15 amp. in this case is fed by us in the numerical relays,plz reply bro
Awesome thanks
Sir Very Nice Video
But i want to know how to test slope charct. of Differential relay
Really the video will be neat but in k2 formula you need to change that's no secondary side CT ratio its primary side CT RATIO divided by full load current
Bro does the pick up value of Id which is 0.15amp. in this case is feed by us in the numerical relays,plz reply bro
Very informative but small figure
sir , can u clarify the CT connection ?...while using the microprocessor based relays the CT connections is star, but without micro processor based relay it was different connections like one side delta and other side star?
Can you kindly recommend a good manufacturer??
Does the numerical relays also have the NO,NC contacts like electromechanical relays????,plz reply sir
Yes it has both no and nc contacts
Nice
what is difference bt transformer & generator to provide differential protection? phase angle & magnitude expect other difference ?
Transformer has two winding, mostly one connected in star and the other connected in delta. when there is an unbalance in the load there will be flow of zero-sequence current in the lines of star connected side, but there will be no flow of 0 seq current in the lines of delta connected side, thus the differential relay might operate during unbalance conditions, in order to avoid it we use 0 sequence filtering in the star connected side. For generators there is no need to use 0 seq filter.
we also use 2nd harmonic blocking in transformers to prevent unwanted tripping of differential relay during magnetizing inrush. for generators we don't need to use 2nd harmonic blocking.
Thankyou...
Hi friend thanks for your nice work. I have a doubt, Why did you marking Y phase current value as
i @(240) degree. ?
phase angle difference between each phase is 120 degree.
then R phase= I @(0)
Y phase = I @ (120)
B phase = I @ (240)
Is it right or not???
But you are mentioned always Y phase is I @(240) ???
PLOT FOUR QUADRANT THEN DRAW THESE PHASES. AT 120 DEGREE IF YOU PLOT YELLOW PHASE THEN DURING ROTATION OF PHASES IT WILL BE ACB INSTEAD OF ABC. SO THATS WHY WE TAKE ANGLE FOR YELLOW 240 WHICH IS IN THIRD QUADRANT
Ramchandra Ramesh if you get answer please send me
Nasir Khan I didn’t understand,would you explain it clear with a figure
Sir is the pick up value of Id is also have to fed by us in the numerical relays,plz reply sir
Yes.......it depends on the rating of the transformer.
Why did you divide by the root of 3 at 17:45 isn't the transformer Y connected on that side?
P=ROOT3 X V X I ; I= P/ROOT3 X V ; OK ; This a simple 3 phase power formula for 3 phase networks ,
Sir induction motor protection ka video upload kariye plz
For the INDUCTION MOTORS protection,we have to use the DOL starter,if the INDUCTION MOTOR is up to 5 hp,& for the protection of INDUCTION MOTORS more than 5 hp we have to use the star Delta starter or soft starter,WHILE THE BEST WAY IS TO USE A VFD(VARIABLE FREQUENCY DRIVE),THIS VFD NOT ONLY PROTECTS THE INDUCTION MOTORS,BUT ALSO WE CAN CHANGE THE SPEED OF INDUCTION MOTORS,BY CHANGING THE FREQUENCY IN THE VFD.😊😊
PLS SHARE YOUR DETAIL
In hindi pls.
🍐🍐🍐🍐🍐📡📡🔌🔌