Current Transformers (CT)
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- čas přidán 25. 06. 2024
- Current transformers are used extensively in metering and circuit protection. Eaton's Power Systems Experience Center is the ideal place to learn how to properly apply CTs considering accuracy, types, safety, temporary and permanent applications.
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Just about a quarter of an hour, yet one gets real value comparable to a 24hrs lecture. Thank you
Your definition of a CT alone at the beginning is worthy of millions! No one has been able to explain to me what a CT is properly until now...
This is one of the best video posted on this channel. Very well explained.
This is the best and detail presentation! Please keep up on uploading more videos. Thank you!
This is one of the most videos that was shared a good information about CTs, Thanks so much.
The very best explanation ever.
Thank you.
This is how presentation and explanation should be, many thanks.
Great video. I appreciate the thoroughness.
The Best Video Explaining a CT on youtube to this date
Indeed simple explanation of current transformer
Great video.
Thanks
It was about time someone posted a good video on CTs. Thank you.
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@Weston Genesis instablaster :)
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thanks a lot,this is the video that i was looking for
Excellent video!!!!! Great Work!!!!!
This is great knowledge. Thank you.
Amazing explain. Thank you sir
Thank you for the lesson!
This was a great video. Thanks!
Great Video and nice explanation
Great low cost technique for measuring low frequency, high current but for higher frequencies and lower current measurements Hall effect sensors are used but those are pretty much expensive.
Great video, wish I could find a video about CVTs that is good like yours
Very informative. Thank you.
Excellent video.
Thanks
Loved the acting! What a great video packed with useful information. It would be nice to have more information on the test procedure that produces the excitation curves.
Check out videos on MVCT/ MRCT (used for testing CT).
🙏
Realy interesting 👌
Nice demonstration.
Congratulations 👏!
Great explanation
simple and understandable presentation
Makes me want to apply at Eaton!
thnx a lot for your clear explaination👍👍👍👍👍👍👍👍👍
Great video
very interesting learning.
Very nice way to explain
Thank you for the information
excellent.
thanks ticher 👏អគុណ
Thanksអគុណបង👍👏
Hello from iraq well done
nice and useful video
great topic
Thank you so much 👌
Brilliant explanation about CT
thanks for share
Very good information. Can you explain, how to choose the resistance value that can be connected across the CT output?
You da best
Thank You
I think 2:11-2:20 may be wrong? When primary winding has 200 turns and secondary winding has 1 turn, 1000 amps on primary side would produce 1000×200 = 200000 amps on secondary side.
Sir here 1000/5 A, output is 5A is independent on the burden Impedance.?
Amazing knowledge. Please 🙏 could you do video for VT and differential relay for transformer.
Great presentation!
Anyone know the software used to show the vector and sinwave illustration at 10m46s?
MATLAB or EXCEL VBA.
INFORMATION OVERLOAD AHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
(thank you)
Do you have any guide for paralleling of Current transformers?
The diagram shows DC current. How is the load being measured on an AC system? I.e. why does the CT direction matter?
azaming! thanks
I have a question. Please could you tell me what would happen if the primary flow current is 300A permanently and the CT protection ratio is only 200/5 A 10 VA? Is there a possibility of damage to the CT?
It will burn
Depends on the thermal rating factor (TRF) of the CT, and the input ratings of the protection/measuring device. If the TRF=2.0 (very common), the CT will be fine, but will output a continuous 7.5 amps on the secondary. If the protection device can handle that 7.5 amps indefinitely, all will be good. This is routinely done in metering applications in substations.
Hi, I like your video. Thanks
6:18 never leave CT unshorted or unburdened when energized. i had a trouble call from an engineer who burned down a brand new 5k volt breaker because he energized it with the CTs open. what happens is they run away. all the terminal blocks, which are rated to take 30a continuously, all burned into a single smelly glob of plastic
Good lecture thank you very much. please can anyone help me on how to connect a motor protection relay with an external CT. I have an adjustable motor protection relay with internal CT the range is from 10 - 999A, the space for primary main conductor cannot contain my cable size based on the motor capacity, so i want to make use of external CT to achieve same result.
Great video. But the background music sounds like it's a survival video or an explanation of a space mission.
Nice
👍🏻👍🏻
Help me. What mean rated current 10/min. 0,08A? Thanks
Can somebody explain. How is possible 0 vector summary in CT between N neutral and L phase.
Great, well presented video. Thank you! Although I won't lie, the acting at the very beginning isn't going to win any BAFTAs, haha.
Opening ct circuit on 600 volt rated or less is not as dangerous as the higher voltage rated. The older metering handbook stated this. But once an opinion becomes excepted as fact, reality is lost! We have be changing 3s meters for years without a bypass or shunt. Which opens the current circuit!
Can i use 6 CT a one meter for different one more cable?
Very Good 👍👍👍
So how would you choose a CT for residential power monitering?
Say a 20a line and I'd like to reliably know if there is 0.5a to 16a being used? Is there an equation that helps to select appropriate CT?
They are all over ebay for cheap. They need a burden resistor to convert the current to voltage.
Am I correct in assuming CTs can only work with AC?
Absolutely
What do the letters 1H,2H mean at both side of CT?
He explains this at 10:00 what are the odds I was reading your comment just as I reached this part of the video LOL.
Hi, i would like to understand better the concept opening circuit can be dangerus. The voltage step up to 1000Volts. So better to keep always the circuit close or shunt in place
On the 600 volt rated cts the open circuit voltage will only rise a few hundred volts and not thousands., but the higher voltage rated ones will.
How to connect CT meter with 3 different cables...
Cold sequence next
CT is a sensor, it's true that it works on electromagnetism principles and to pick up current passing without interrupting it, it has to rely on induction, so it works like a transformer, but it remains a sensor. CT stands for current transducer (= sensor).
If we call this device a transformer, then perhaps we can call all radio devices including all mobile phones transformers because they all work on electromagnetism and induction principles, no?
Everyone I know, including myself, and every book and manual I read called it a current transformer. And VT or PT as voltage or potential transformers and both are grouped under instrumental transformers as opposed from a power transformer like a distribution transformer. I get that instrumental transformers are essentially sensors, but everybody and everything calls them transformers because they are in essence that, and are tested and treated as such. Ex: Radio device don't spit out high voltages when back feed, and in fact can't really be backfeed effectively at all, they don't have voltage or turn ratios, are not tied to specific electric grids, no magnetic saturations points, no primary-to-secondary insulations values, etc etc. As far as I found, they are originally called transformers from the beginning.
Can you make about potential transformer
If you need either a ego boost or a humility check , come to CZcams
This has been my humility check , Jesus fuck y’all know a lot about electricity ⚡️
1:42 - why are you showing current direction on an AC system? 😮
bonjour, pourquoi mes ton le S2 a la terre sur un transformateur de courant en basse tension
Where is the flash protection?
From 1:48 to 2:00 how did you make the animation
3:57 - agh!!!! What are those arrows support to represent?! (Hint: it definitely isn’t current!)
I suppose that would be the direction of the current carrying HOLES as the electrons would be going the other direction NO?
@@johnjacobjinglehimerschmid3555 no. DC current has direction but alternating current doesn't - it alternates. The whole point of RMS is to remove the sign (direction)
How you are making this animated video
This is definitely is a little lecture
Road Ranger RTLO.....
These really addresses my problems on CTs but I'll like to have some personal discussions with you , please can you inbox to have your email ?
Why is CT not accurate for low currents?
If u measure low current using low ratio ct like 5/5, 10/5
czcams.com/video/8qK5Fz1K0ZI/video.html
Some of the new cts have higher accuracy at measuring the lower currents in circuits. We use high accuracy, extended range cts on new installations.
The magnetic field in the primary will be to low if the primary current is low. The magnetic field must be strong enough to excite the secondary.
You can loop the primary back through the ct to increase secondary.
If primary only has 1/4 amp, looping through ct 4 times will produce 1 amp on primary, increasing the secondary current, but the ratio will be ÷ by 4.
😃😄😁😆😅5 Smiles
I'm calculating the number of secondary turns on a transformer where the ratio is 8:3 with a voltage of 440V and 750 turns on the primary winding and a 40 ohms resistor on the secondary winding so my brain is dead
buy a megger ttr. this will give you a better idea of turns ratio. for example if the transformers primary is 12470v and the secondary is 480/277Y. divide 12470 by 277. this will give you the exact turns ratio results.
The sound of the videos is not good
Hindi me
Umm, I still don't understand lol can he explain like I'm five?
The music is horrible in this video
fuck me im dropping out