01 - What is 3-Phase Power? Three Phase Electricity Tutorial
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- เผยแพร่เมื่อ 11 เม.ย. 2018
- Get more lessons like this at www.MathTutorDVD.com
Here we learn about the concept of 3-Phase Power in AC Circuit Analysis. We discuss the concept of separate phases in a three phase circuit, and how the phases are arranged to make the circuit balanced.
We discuss why 3-phase power is useful, and how the transmission line connects the three phase source to the load in a practical circuit. We also use phasor diagrams to label each phase of the current and voltage.
I'm heading into school soon for 3rd year electrical... I have been using all your lessons for over 3 years now. You have taught me so much. I wish I could chat with you one day. Thank you for all your lessons over these past few years! You have been instrumental in developing my understanding of electricity and I believe I am a better electrician as a result. Really can't say thank you enough. With deep admiration and respect, sir, Thank you!!!
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I really appreciate how you start with a road map of the structure of the material you will cover
Thank you! After all these years, I am finally enjoying mathematics! Keep up the great lectures!
Thank you!
Your explanation was clear and concise.
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You are a very good teacher. You can explain in a very simple manner trying to let the listeners understand even if they don't have enough background in electricity/ electrical circuits. Do more videos on basic electricity. Thanks.
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You made concept of 3-Phase power in a AC Circuit Analysis so easy to understand.
Thanks! I’ve been working with electrical and have been meaning to find out what the difference is!
Very informative. Thank you so much for sharing.
Thanks you for posting this video, incredible lecture. 🙏🏼
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Brilliant teacher. A thorough explanation that makes it easy to understand a concept that can be difficult to understand. Well done.
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Thanks for the great video. I love teachers that explain all details needed and never complicate anything. Thank you, us students do appreciate you!!
Excellent and clear explanation. Thank you.
Keep doing videos!! They’re great and easy to understand!
Very clear and concise. Thank you. Phasor diagram is wonderful.
Hello, thank you for the informative video. It answered some of the questions I have as I learn about electricity. However, I think there might be a problem with some of the math... if you have a cos b(x-c) + d, you get a magnitude of a, a dilation of b, a horizontal shift of c, and a vertical shift of d. Now the one I think might be incorrect in the video is the horizontal shift of c. If you have +120 degrees, then that should shift left (or negative), not positive. The reason is that c is subtracted, so if you make it +, then you are subtracting a negative. Likewise, if you are going to do -120 degrees, that should be a shift to the right because you are subtracting the positive value of 120 degrees. So if you have cos (x - 120) that means the cosine graph shifts right 120 degrees.
If I am misunderstanding something, please let me know because I want to understand this, but I think that might be wrong, so I'm asking for your input. Thanks!
Nice communication skills . Clear speaking skills nice awesome extra ordinary . Tnx alot
Thank you.
You are the best instructor I have on this subject. I probably have this thing more than 30 times since high school, but this is the first time I really find it useful and make sense.
It is your "MOTIVE" method makes the new knowledge associate to things I already know, smoothness operation of motor.
I guess none of my previous instructors really works in this motor design job.
One suggestion, start with a resistor to explain the power thing 3 phase world probably cause confusion.
Negative power for capacitors and inductors?
Do you mean some thing get colder when pass current to it?
If I am teaching this, I will use a running motor as a model only, There is no isolated resistor, capacitor, or inductor. And the power is not just heat, but heat plus rotational energy.
Negative power means put breaks on and take out rotational energy.
Power hear is Power Flow, with direction, source, and destination.
Some of my words may need refine, but I have a clear a model now.
on your first video, I watched in 3 sections, about 5 min. each. Rewind a little, paused a few times, until the image of fast turning motor becomes solid at the center of my view.
This image probably not good enough for you, but is good enough for me not to push the 3 phase world aside.
If a running motor, may be an old record player, is running in the background, with unsteady speed, it might help student.
Thanks again.
Awesome explanation, on y-y it great for balance load and on delta- it’s great for heavy loads.
Wonderful and gifted tutor!
Your skills of communicating your knowledge is superb Sir!
Maths was never my strong subject. I wish I had you as a tutor when I was at college.
Keep up the great work with your videos!
Teaching may be the noblest pursuit, my utmost respect to you sir.
I'm Electronic Engineer working as software programmer, in these days my interest caught by solar and started solar training and your video help me lot to understand clearly 3 phase 😀
I worked in a textile mill years ago and most everything in the mill was 3 phase. You don't need a start or run capacitor on a 3 phase motor. You have a problem you just ohm it out and look for a short or a bad bearing or bushing. I can tell you a little old school secret I learned. If a motor is hot when you check it then it is good. A motor with an open winding will cool off since it isn't trying to run.
Thanks for the tip!!! Greatly appreciated.
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I thought a capacitor was to put the current out of phase which gives the motor additional torque to start,
@@vxnova1 yes but in 3 phase there is no need for the cap cos atleast 2 of the phases always have torque even if 1 phase has 0 torque therefore start up cap is unnecessary
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thank you so much for these videos! clear cut explanations without question.
Now I understand what a 3 phase connection really mean. Thank you sir!
Thank you for showing math and science now because you’ve been showing this I got a 100 on my test
Very brilliant and well explained. Thanks
This would explain 3-phase motors in most ebikes today. I’m teaching myself how to repair my ebike. Frustrating but enjoyable process.
Funny story😏controller died on my ebike when I got caught in rain. 2nd controller in six months. Fed up😡with mediocre customer service in getting parts (please…never said I’d do it myself. Cut the motor cord to keep me motivated, bought parts, watched tons of TH-cam videos and finally. After about a week of going from knowing nothing to learning the basics, I upgraded my controller (checking MOSFETS, resistance, etc are correct), added new LCD display, and learned all about Hall sensors, 3-motors, amps hour, voltage, power, phases, etc in the process. AND that hub motor spinning the other day 💪🏾
Videos like your help a lot. Thanks.
/Bklyn👑
Very good teaching style..logical steady progression always keeping a tap on the cognitive loading on the learner.
You are very helpful with all your videos!!!!! You need your own channel
Amazing explanation. thank you
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Very informatice
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Very well explained!, thanks
I took Robotics in College, I struggled so much with electricity and electronics. I was able to follow you in your short lesson more than what hours of beating my brains could accomplish.
For robotics and such, what are some things you would suggest learning? From the basic on up?
You are an awesome teacher. is very easy for you to get the message across. Two huge thumbs up!
Why not multiples of three? Six or Twelve?
Thanks, sir. very well explained. I am a marine engineer and i am not so good at electrical. But know I may improve. thanks a lot again.
Thanks sir.
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Hats off to you...God bless you
this is very nice lesson like me im first timer electrician but im only electrician in my company pioneering.. thanks master ..
Good 3 phase intro! makes the next smoother!~
A competent teacher.
Thanks.
I wish I had a teacher like this for my Part 1 engineering class.
Its crazy how many college students did not like or easily learn from their teachers..
They are paid either way and have political agendas
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Excellent explanation! Thank you!
Very very clear and informative
I used to work with three phase power on commercial airliners where it very useful for instrumentation and for high power. Mostly on 400 cycle systems syncrotels and control servos etc. I had studied an electronic engineering course for 3 years at Miami/Dade college.
Thanks. I've ben looking for months for a simplified teaching of 3 phase. Ty
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I am impressed, it was very easy to understand, thanks for the course.
What if I want to learn this and get cert or diploma, is it possible?
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Really educative, keep it up have learned alot, thank you
Your explanation is very good to understand.
Each phase magnitude divided in 120d interval base angles leaves initial cosign separated in 3 negative directions in all power applications.
Well done. Simple and clear
Hi, i have a question and hope i can find the answer. If i am going to design a generator with 6, 12, or 24 phases how can i connect the phases to get at the end one positive and one negative output. Thanks
I would say simply a great teacher!
This video brings back memories of my electrical class in 1978! I hated my electrical class, made no sense. This is great information if you want to teach this math. Simply put, an alternator has equally spaced coils connected into three outputs each is 120 degrees apart. No big deal! I started as an electrical drafter in 1983, fell in love with my job and stayed with it until 2018. I designed residential, commercial, and industrial projects almost all with three phase systems. I became a PE in 2007. The point is, this point should be a 2 minute discussion and done. In the whole time of designing systems, I never used the math shown here. It's useless in the real world. But if you want to teach, it's good to use up time.
@Dan Mattingly Well said!
@@KevinCoop1 Agreed! You can't build a house without foundations!
Maybe I somehow had the foundation and didn’t realize it. I still feel that they try to make the math that is easy into something complicated.
Thank’s, really appreciated!
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I enjoyed this video. It all seems to make sense in the context that you explain, but I'm still stuck trying to find an on-ramp for this material. Why are angles a part of this at all? How do angles relate to magnitude, and what is magnitude in this context? I hope we can backtrack in future lessons and explain some basics.
We get 3 phase supply in our homes to sump pumps, grinder motors, central air conditioner, & refrigerator,? We don't hear noise or vibration.
I have a question:
What makes phases to dephase? How does it come naturally to be dephased by 120 degree?
thanks!
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This video is amazing. Thanks
what is wrong if interchange phase Vb from the 3rd quadrant to the 2nd and phase Vc from 2nd to 3rd quadrant respectively
The lightbulb has lit thanks to these tutorials
Wow great lesson. Thank you.
But why cosinus instead of sinus ?
In the 1980's as a Cadet Deck(Navigating Officer) on ExxonMobil Tankers(then Esso) we had to learn about the 3-Phase System with electrics on Sluice and Penstock Valves in Cargo Tanks. Anybody without "A" Level Physics struggled with this ! Luckily we had a very senior Electronics Officer onboard (not a Sparkie) who explained it all to us and his name was Tom Morley a huge Guy with a beard.(Epaulettes 3 gold stripes with green in between ...a very rare rank)
Very good training session
I am interested of your Lecture sir actually i am Electrical And Calibration so iam engage with your explaining about Electrical thank you
Beautiful!
Should i get a 220 step up to run washer and dryer and freezer add to my shop?
The same three phase power 220vac. My main circuit breaker is 30A and the wires are good for 30A. But the equipment I have has a circuit breaker 50A. This equipment has three heat element connected to each switches. Before I turned on first switch the volt meter reads 220vac. After turned on 1st switch meter read 218-219vac. 2nd switch on 217vac, 3rd switch on meter reads 216vac. What should I do in this case. If anyone has any suggestions. Thanks for your advice.