Thank you Dr. Sam. I really enjoy your videos and your clear presentation of topics. I use Rogowski coils regularly in my work and your latest video brings back memories of ECE220 at UW-Madison where I sat in the lecture hall thinking "When in the heck am I going to use this stuff !!" Little did I know what the future would hold for me. I often refer your videos to younger engineers when they have questions on similar topics.
Prof. Sam Ben-Yaakov, thanks for this (and many other) lecture(s) it just struk me that I have been working with Rogowski Coils for over 15 years. I wanted to point that the current rating on the data sheet refered to a short cct scenario and not a nominal current - no primarry conductor will carry 20kA and survive but Rog coils are proving to be a better substitute to current transformers. That said, I thank you for enlightem me that the circular integration funtion is actually a contour integration. I haven't proven it but I learnt that if the Rog coil is wraped twice around a primay conductor the output will double and so forth. One more thing, it appeas as a phenomena that the clip of the Rog coil is just for mechanical puposes having no electrical characteristics but it's key to ensure a closed loop for the induced voltage to work.
15 years? you can teach me. Sure, taking 10A/mm^2 as a pointer, you need a conductor with 2000mm^2 for a continuous 20kA current . Thanks for the interest share.
@@sambenyaakov Sir i still got loads and loads to learn from you. Your lecture on Wireless Power Transfer has helped me in my PhD research which I am still working on. I wish I could share some ideas I have on Wrieless Power Transfer for Electric Vehicle charging with you some day. Thank you for your lectrues.
@@pastorgraham6344 " Wrieless Power Transfer for Electric Vehicle charging with you some day." Now is the day? you can write to me at sam.benyaakov@gmail.com
Hello Professor, maybe I'm wrong, but I think on slide #8 there is no 1/(R3*C1) zero. As frequency increases 1/(w*C1) keeps decreasing and the module of the gain (=Zfb/R3) keeps drooping toward zero (-infinity in dB). Of course this is assuming an ideal amplifier...
Thanks for the correction. I was thinking about a ground connection to the other terminal. In any event, the picture will be similar considering a practical amplifier. But you are right.
Thank you professor for your lecture. Maxwell's equations and Amperes circuital law are difficult for me to understand as I have no formal instruction in calculus. Still you explain the process of integration of the coil and explain a case where the coil is not circular. Thank you so much for showing the relationships between magnetic flux turns ratio and differentiator response. Your expertise is priceless. Again thank you for the upload👍
Can the integrator be replaced by a simple shifting the sampled values of the current coming from the Rogowski coil and measured direct voltage by 90 degrees (5ms for 50Hz) in the memory and used to calculate power consumption from the utility mains?
Thank you Dr. Sam. I really enjoy your videos and your clear presentation of topics. I use Rogowski coils regularly in my work and your latest video brings back memories of ECE220 at UW-Madison where I sat in the lecture hall thinking "When in the heck am I going to use this stuff !!" Little did I know what the future would hold for me. I often refer your videos to younger engineers when they have questions on similar topics.
Interesting. Thanks for sharing.
Nice explanation. Thanks.
👍🙏
Prof. Sam Ben-Yaakov, thanks for this (and many other) lecture(s) it just struk me that I have been working with Rogowski Coils for over 15 years. I wanted to point that the current rating on the data sheet refered to a short cct scenario and not a nominal current - no primarry conductor will carry 20kA and survive but Rog coils are proving to be a better substitute to current transformers. That said, I thank you for enlightem me that the circular integration funtion is actually a contour integration. I haven't proven it but I learnt that if the Rog coil is wraped twice around a primay conductor the output will double and so forth. One more thing, it appeas as a phenomena that the clip of the Rog coil is just for mechanical puposes having no electrical characteristics but it's key to ensure a closed loop for the induced voltage to work.
15 years? you can teach me. Sure, taking 10A/mm^2 as a pointer, you need a conductor with 2000mm^2 for a continuous 20kA current . Thanks for the interest share.
@@sambenyaakov Sir i still got loads and loads to learn from you. Your lecture on Wireless Power Transfer has helped me in my PhD research which I am still working on. I wish I could share some ideas I have on Wrieless Power Transfer for Electric Vehicle charging with you some day. Thank you for your lectrues.
@@pastorgraham6344 " Wrieless Power Transfer for Electric Vehicle charging with you some day." Now is the day? you can write to me at sam.benyaakov@gmail.com
Hello Professor, maybe I'm wrong, but I think on slide #8 there is no 1/(R3*C1) zero. As frequency increases 1/(w*C1) keeps decreasing and the module of the gain (=Zfb/R3) keeps drooping toward zero (-infinity in dB).
Of course this is assuming an ideal amplifier...
Thanks for the correction. I was thinking about a ground connection to the other terminal. In any event, the picture will be similar considering a practical amplifier. But you are right.
Thank you professor for your lecture. Maxwell's equations and Amperes circuital law are difficult for me to understand as I have no formal instruction in calculus. Still you explain the process of integration of the coil and explain a case where the coil is not circular. Thank you so much for showing the relationships between magnetic flux turns ratio and differentiator response. Your expertise is priceless. Again thank you for the upload👍
Thank you for sharing. Comments like yours keep me going.
Doing magnetics is something very interesting. great video as always .
Thanks for comment.
Thank you!
👍🙏
I just read several papers on the Rogowski coil yesterday. Thank you for this talk which confirmed my understanding.
👍🙏
👍🙏😍
🙏👍😊
Can the integrator be replaced by a simple shifting the sampled values of the current coming from the Rogowski coil and measured direct voltage by 90 degrees (5ms for 50Hz) in the memory and used to calculate power consumption from the utility mains?
An integral of a square wave is a triangular wave. So integral of distorted signals is NOT just a simple phase shift.
@@StanZurek Yes, that's why I asked for utility mains which are sine wave, as the integral of Sin x should be just -Cos x.
No it is NOT just cos, you forgot w.
Hi sir when a new video is coming?
😊I have been extremely busy but not neglecting the videos! Hopefully in a day or two.
@sambenyaakov Many Thanks sir 🙏