Transformer Core and Cooling

A description of how and why a transformer core works, and the importance of keeping a transformer within its temperature rating.

[@PhilsJunkDrawer]

As an EET grad working in protection & controls, it’s always nice seeing your uploads. I always learn new things, even if I’ve learned the concept before. Thank you!

[@bennyrosado1414]

This is where I come to solidify learning.💪This channel is second to none! Thank you Mr. Gordon

[@therealprofessor976]

You are a very good teacher. I am still learning, but this is helpful. Finally a use for triangles and pythagorean theorem. Imagine if my classmates knew that all these things we're learning have a purpose. They'd be surprised.

[@s_the_first]

bruh!!! they can be applied to ANYTHING!!!!

[@therealprofessor976]

@@s_the_first Not everything but yeah. I am not a uni student and I was surprised.

[@mattdallass5916]

I love your teaching and I LOVE your Soli Deo Gloria sign!

[@ironsquid9724]

The way you explain things step by step in a simple manner is amazing

[@ziyashirinov6283]

The best teacher! Nice to see your new video

[@davegordon6819]

I appreciate your support and kind words. Thank you.

[@nizbrel]

A comment from Colombia, our government has translated the NEC regulation and rebranded it as NTC which is mandatory to follow, I really like the way you explain it, is so much more understandable than my teacher's lessons ('cuz some ideas get fuzzy in the translation process), thank you!!

[@brunofonseca9686]

The way you explain things, it's just something else. Kudos from Brazil.

[@thewibb]

This and the previous transformer video have to be some of the coolest visual demonstrations of difficult to understand physics principles ever! ABSOLUTELY amazing gift for instruction! You sir are a treasure! PLEASE keep teaching!

[@ITSezacTHEemce]

Waking up to a new video from Dave is always a treat

[@sureshmani7677]

Thank you very much sir

[@davegordon6819]

You're very welcome. Thanks for your interest.

[@carlluis770]

Im an electrical engineer new to construction find your video amazing

[@kshiteeshbijjula8000]

Thank you very much Dave. I am an electrical engineering graduate and am employed now in Railways Sector. But my Core Concepts have been deteriorating. Your videos are helping a lot to refresh my information cells as well as providing a clear cut perspective on the concepts. Thanks a lot again.

[@kshiteeshbijjula8000]

And one more request... Please don't stop uploading.

[@shulavrawal4780]

Found gem of a channel loved it

[@crisantoejera5745]

Thanks a lot for sharing your knowledge. Your teaching is very clear.

[@alimazloum1]

Excellent video Dave! That's a great way to find the XL and R.

[@justwelltariang2456]

Great demonstration Sir.

[@plee6305]

Thanks, Dave. Outstanding job, really looking forward to more videos.

[@jeromewelch7409]

All the thanks to you, Dave

[@salysaly6168]

Hi I'm from morocco Thanks for this video

[@francoisguyot9770]

I truly love your emphasis on being pragmatic while teaching this material. I have one question for you about the core material. I noticed that toroidal cores are made of a long laminated coiled ribbon of Fe-Si... Well is the Silicon, part of the alloy, or is it just sprayed on the surface of the ribbon as electrical isolation to prevent the core in becoming a solid donut... to minimize the Eddy currents like you mentioned ? But being a continuous band, wouldn't it promote those Eddy currents instead? If so, should this ban be interrupted by making it a staggered muti-bands core? On the other side, the gaps introduced in the "E-I" transformer cores seem to be responsible for their loss in efficiency? So...I'm confused..!!!.

[@gyixtao6892]

J-man here, been working in the field for damn near 20 years, and you sir, are great!. KZbin just pushed your videos to me, and I've been catching up. Any chance you could cover a Secondary Tie situation for me? I got into quite a spat with my boss at the time over what I thought was a seriously loose interpretation of the code. Thanks!

[@SathishKumar-mz5sn]

I like your video❤

[@graysonking16]

That man's electrician's codebook is more worn than my grandma's Bible 😂

[@arthurmorley3991]

Excellent work there. Please can a 60hz transformer work on a 50hz supply? Thank you

[@SB-dc9qb]

Thank you

[@therealprofessor976]

I know you're in a series talking about transformers, but do you mind at least considering taking a look at saturable reactors? I think it somewhat ties in, and it's a very interesting subject.

[@therealprofessor976]

I think it's a good old-school control system that even still has modern uses and can be demonstrated easily. I find it fascinating, and a lot of hobbyists create them to control their high-power devices, as well as for fun. You can demonstrate it with both powerful magnets, and a winding on a transformer acting as an electromagnet for the entire core.

[@ShubhadeepBanik]

Dear Sir, thank you so much for this video. Please tell us the name and author of the book you are referring. I will be also thankful if suggest a good book on Electrical Machines.

[@robertgregory2618]

Excellent. Why doesn't the 500 foot spool of copper blow a fuse, it seems it is a direct short. What am I missing...

[@davegordon6819]

In short, the answer is "Inductance", which I try to explain that in a couple other videos. One is the first video in this "Transformer Concepts" playlist: kzbin.info/www/bejne/q2ebZ3WuhNqSqrM I also made some other videos a couple years ago that address this concept: What is an Inductor: kzbin.info/www/bejne/mHzCk5lpn72WrZY Effect of Inductive Reactance: kzbin.info/www/bejne/nF62dnmfjcqGp6c

[@thebigd6249]

Hello Mr. Gordon, I conducted the same experiment you did here with a spool of wire. I used 12AWG, THHN Stranded. Looks similar to the wire you used in this video. Only there was about 250 feet of it rather than a full 500 foot spool. That may be key to my findings in contrast to yours in the video. So, from the 120 volt circuit, I measured right at 120 volts, pre-experiment. During experiment I found the line voltage went up by 5 volts, to 125. The clamp meter read 75 amps over the winding. Yes, the 20 amp breaker tripped within about 3 seconds. The spool of wire was warm but not hot. No smoke, arcs, or melt downs. I tried the metal rod through the center as quick as I could with nothing. So what am I doing wrong?

[@davegordon6819]

I can't say why the line voltage went up in your case, but the 75 Amps sounds within range for 250' spool of #12 (depending on number of turns). My initial question is if the metal rod you used was ferrous based, meaning it's made from iron. An easy way is to see if a magnet sticks to it. Try putting the ferrous rod, or a few of them, in before energizing the coil as 75 Amps is quite a lot for a 15 or 20 Amp circuit. Additionally, you may well be aware of this, but you don't want to intentionally trip the breaker too many times as running more current than the circuit is designed for can cause issues over time... The other comment I'll make is that you need to be careful with where your ammeter is relative to the coil. If it's too close it may read incorrectly depending on its orientation. Here's a video where I use a couple hundred feet of #18 with varying numbers of rebar cores. I turn it on at 2:20 and you can see the voltage drop when I turn it on: kzbin.info/www/bejne/nF62dnmfjcqGp6c

[@BearsTrains]

@@davegordon6819 Hello Dave. Capacitance is why the supply voltage rose. This is a major problem in long distance HV lines and is only resolved by reactors. Even then, the solution is not perfect. I was a substation maintenance fitter and protection tech for 30 years and have seen 220kV jump to over 500kV when the reactors on 2 lines in series (total about 650km) were taken out of service by mistake. Nothing blew up as the BIL rating of the equipment was 650kV

[@shubham106]

❤❤👏

[@rose8872]

👏👏👏👏👏🙏🙏🙏

[@alisalmani9499]

thank

[@abdulbasith6948]

🎉

[@notnecessary7730]

Whaaaattt.......how does that NOT trip the CB?? How does that NOT melt to insulation on that wire?? How is that NOT a dead short??? Something doesn't make sense here

[@quinnbattaglia5189]

It's probably on a 20amp breaker, which would trip if he kept it near 30 for a while, but it won't instantly trip until 40amps.

[@thewibb]

His explanation should absolutely make this clear, that's what's so amazing about it! He's visually showing you the effects of impedance/inductance and EMF/back EMF. When I found his videos I'm literally in super nerd mode because this man has literally found amazing ways of showing the physics principles! SO FREAKING COOL! 🤯

[@mywifesboyfriendisfire]

Sounds like the dampeners are a little tight on your transformer. 😉