Current Transformer Basics | Effects of CT Saturation on Protection Relays

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In this video we discuss what current transformers (CTs) are, and how their performance, especially during power system faults, can affect the operation of protection relays due to CT saturation.
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00:00 Intro
00:29 Current transformer (CT) operation
02:04 CT saturation introduction
02:45 CT saturation curve
04:34 Effects of CT saturation on protection schemes

[@romeroengineering]

Learn more with our online courses here: www.romeroengineering.co/courses

[@chrisr3592]

I highly recommend a video focusing solely on Open Delta transformer banks. Great vid.

[@Fidahussain82]

Well illustrated

[@romeroengineering]

Thanks!

[@faissalelt]

Thanks a lot, very easy and simole exolaination

[@romeroengineering]

Thanks!

[@sohailjanjua123]

Hi, I like your video. Thanks

[@romeroengineering]

Thanks Sohail!

[@BeepBopFlopKaplop]

Great video Romero. Maybe in a subsequent video you can discuss what is happening to flux in the core while the CT is saturated and why. Would also be nice to relate to power transformers and inrush during their initial energization. Again, great video - I am going to subscribe!!!

[@KH4UF]

You got any advice to where to find more of such practical videos?

[@romeroengineering]

Thanks John! Will consider it for a future video.

[@delosmark18]

Can you pls also discuss how to size and specify a current transformer and potential transformer?

[@Herverify]

Thank for the explain, engineer what software do you use to illustrate

[@punkanidea]

Thanks for the easy to understand explanation! Are you familiar with class PX or PS CTs which (i guess) are commonly used for transmission line protection relays? In what case would we see benefits to specify class PX/PS CTs instead of class 5P10 or 5P20 (as per IEC standard)?

[@KH4UF]

Good explanation. Just bought udemy subscription but sad to see your courses aren't a part of it. I really wish to learn from you as we use a lot of SEL relays in our power plant. But the fee structure is slightly high for India. Hopefully that would be addressed some day.

[@romeroengineering]

Hi Ajmeri! Thanks for reaching out. Unfortunately, we don’t have control over what’s included in Udemy’s subscriptions. You can, however, sign up for our monthly subscription here: www.romeroengineering.co/offers/FRPvBQDG/checkout This gives you access to all of our courses. -Ricardo.

[@KH4UF]

@@romeroengineering I did check your website first actually, but realised its the same pricing pretty much and that too in $ USD. Our local currency is INR

[@cutiefun3]

I'm a bit confused at the 2:00 mark, technically the 5A is flowing out of the CT at the 5000/5 CT, correct?

[@romeroengineering]

Hi! You are correct, it looks like I drew the arrow backwards for the low side CT secondary current. At the 2:00 mark, we're saying current is flowing OUT of the polarity mark on the primary, so 5A would flow INTO the polarity mark of the secondary.

[@shahyar05]

I wish I could participate in these courses,

[@romeroengineering]

Thanks! You can find out more about our courses here: www.romeroengineering.co/courses