How 3 Phase Transformers Work – why we need them

:_Hazard: This free video took WEEKS to make! If you’d like to support Paul’s efforts, links below: Watch ad-free here:➡ www.patreon.com/theengineeringmindset Get your PDF here:➡ tinyurl.com/3-phase-PDF 👑Grab a 3 phase transformer mug here➡: tinyurl.com/3-Phase-Mug-1

As a college grad in Electrical Engineering you guys won’t find anything better than this video. This is as good as it gets.

Just wanted to say I really appreciated how you re-orient some of the diagrams that position the schematic how it would be sitting in a physical transformer...as someone who is just curious "how stuff works" this is something I've never been able to wrap my head around you could have separate transformers doing 3 phase power even though I've seen the "triangle and Y" positioned diagrams countless times I just couldn't wrap my head around how it was possible until I saw your diagrams MOVE in the video and something finally clicked how the "real world position" would be vs the "diagrams" you see all the time! That was great!

I am an Electrical Engineer graduated in 2020 I find your videos very helpful for my MEP Construction Job and understanding the National Electrical Code and Electrical theory.

This YouTube channel is gold-mine

As a retired Dutch engineer, working with single fase and three fase only, without any half tap at 120 Vac, this video finally explains how it works in the US. Thank you very much.

I’m showing all my substation interns this video to help them understand the madness behind electricity. ⚡️ As a PE working in substation engineering, I wish I had videos like this when I started 10 years ago. I truly appreciate your gift to teach. 🤝

Some interesting things about 3phase transformer connections. Delta - Y is usually preferred. Thats because 3rd harmonics don't get transmitted back into the incoming line. A zig-zag transformer can be used to create a central ground for delta connections, but that is only used for special industrial settings, at least to the best of my knowledge. In the US, Delta high leg and open delta are becoming obsolete. They were an out growth of the split phase systems used in residential power configurations. They are usually not installed in new service systems anymore. The vast majority of operating ones are legacy connections.

this channel is 100 times better than my professor......

I just want to say big Thank you for your videos. I am in an electrical apprenticeship and these videos are really helpful with understanding how these equipment and thoery works. Ever since i started watching your channel i have become better at trouble shooting and overall a better electrician! THANK YOU!!!

In 2005 when my mother remarried and moved to my stepfather's farm, we had an open delta 3 phsse, because we had a grain dryer, conveyer and large auger with 3 phase motors, with the majority of our loads being 120/240 single phase, transformers on the roadway, pole with meter and site disconnect in the middle of barnyard, single phase ran to house, 3 phase to barn, where there was a 3 phase panel dedicated for the motors, also feeding a single phase panel beside it for the other loads. Otherwise roughly 1/3 of the panel slots would be wasted because the B phase (high leg) is unsuitable for single phase loads, which is a major disadvantage of a 4 wire delta service and thus the 208Y/120 & 480Y/277 (or 600Y/347, if you happen to be in Canada or a few areas in the US) is a much more common and useful configuration. Open delta is still fairly common on some farms and small commercial buildings where the customer has mostly single phase loads, while also requiring limited amounts of 3 phase power, since it's cheaper to set up than a wye bank.

This might be a bit dense for a total newbie, but I'm finding it a wonderfully efficient, clear, and comprehensive refresher that really brings together the substance of multiple other longer sub-topic videos.

Ok. Ok. I understand that this might be more information than most people even care to know about how electricity (like the stuff that powers your home and, well, life) works, but I found this single video to be just about the best crash course on the subject that I've ever seen. He's managed to condense an entire college course of material into one video. Blew my mind at how well he did this. Also, don't let the British accent throw you. He's explaining the USA power grid.

I need to watch the rest of the video, just noting at the start the video shows peak voltage of 120v; 120 is the RMS voltage, peak is 169.7v.

Funny how different it is in various countries. In Poland, for instance, majority of households (at least not flats, but freestanding buildings) uses 3-phases split from 400V.

Thoroughly enjoyed. Even your sponsored ad was great. If I ever need a 3ph, MW transformer for my garage shop, I'll be sure to contact Maddox🙂

Thanks for the breakdown. As an electrician for 14 years, I've always wanted to know how the different configurations of delta/wye affect voltage/current output. The most intriguing thing is the ungrounded delta primary which gives uncommon voltages to ground. Very cool....

That was a GOD level explanation. Not even professor level...... But, GOD level ....... I bow down to you

THANK YOU! This is the best layman explanation I've ever seen.

Thank you for this video. So detailed and easy to understand. Goes step by step and doesn't go backwards, but rather it references what you learned earlier in the video and applies to the current topic.