I remember my EE professor from my undergraduate days filling three chalk boards with a beautiful derivation of WHY three phase power, why not 4, 5 or n phase power? Answer: Because three phases was the minimum number of phases whose average power was a constant. Additional phases require additional windings and transformers, so go with THREE phases for the most efficient power grid. Beautiful. How I wish I had a video of his derivation. Even after over forty years as a now semi-retired Electrical Engineer who dealt with RF systems (FM broadcast, TV broadcast, and microwave), it was masterful derivation.

@theachebes5724

Жыл бұрын

Wow good testimony. Can you mentor someone? I am an electrical engineer

@dane1234abc1

Жыл бұрын

@@theachebes5724 Not on 60 Hz AC power. My AC power/motors experience ended with college. My experience is in RF-- its propagation, and also loss/gain calculations for hight power radio and TV stations. Did several 5 MW ERP/60 to 80 kW TPO analog TV designs, but with digital the maximum allowable ERP is just 1 MW, so TPO's are typically in the 40 to 50 kW range. Still, it's 6-inch rigid coax line to handle the power. No more waveguide transmission lines, given that UHF TV now stops at Channel 36 (605 MHz) instead of Channel 69 (803 MHz).

@mcrbyn

10 ай бұрын

i'm ee undergrad student, can i get your contact?

@mhlwebs

2 ай бұрын

most stupid explanation

You are a true educator, not only do you make it understandable, you also create the desire to learn more, many thanks

Been studying for an upcoming test and needed some refresher material. You explain the material beautifully. Definitely have a knack for explaining complex processes in a simplified manner.

Of all the videos I have watched regarding 3 phase power this is the best one. Thank you.

Thanks for the professional breaking down of information to simple yet informative points. It's great to have instructors like you.

Great explanation of three phase. My son is entering the generation field and this will surely help him better understand three phase vs single phase. Me, 30+ years in hydro generation, so sometimes Dads explanations might be a little over whelming. Thanks.

I've was only wondering about 3 phase for about 25 years now, thank you.

@enyakang6950

3 жыл бұрын

Is there a Grammer error? I have was??? Think you for your advice

@bobsmith3291

3 жыл бұрын

Say that again in English

@ianstobie

2 жыл бұрын

@@enyakang6950 Yes. He meant "I was only wondering about 3 phase for about 25 years ..." but another way of saying it would be "I've only been wondering about ...". So he probably started one way then switched to the other without noticing. As you probably noticed, the "only" is ironic, because 25 years is really a very long time to wonder about something. Only been wondering for 25 years! I've been wondering for longer, as I'm probably older and it's a long time since I first heard the term.

Super video. The detailed graphics and annotations are really helpful

Best explanation of 3 phase power I have come across. Currently I am an apprentice electrician.

120V/240V "residential" power comes from a single 240V phase supply line produced from a step-down transformer (secondary side). The primary side of the transformer is fed by one phase (1 of the 3 phases) from the substation (commonly 12kV). The secondary side of the transformer is stepped down to a 240V SINGLE phase output. Because the secondary of the transformer is split into two halves with the neutral (or ground) at the middle of the transformer's secondary winding, two 120V reference-to-ground signals are produced. So there are 3 wires coming from the secondary of that transformer, (2 hot--1 wire on each end of the winding, 1 neutral/ground wire tap at the middle of the winding). Measuring the voltage potential from each hot wire to the neutral wire yields 120V. Measuring the potential difference from one end of the winding to the other end yields 240V (ie. 120V + 120V...actually, 120V minus a negative 120V). This configuration is also called a split-phase system. I added this comment because at 8:00 of this video, it's not clear enough, because it says "it's 2 single phase lines". Technically, it's one phase split into two halves and the waveforms are "out of phase" only because they are referenced to ground at the middle of the transformer winding.

@fuckjewtube69

5 ай бұрын

I understand all that 100%. What I can't understand is how is there not live power on the neutral?

@ALM1936

5 ай бұрын

@@fuckjewtube69 here’s my understanding, take it for educational purposes, not instructional or safety purposes: the neutral wire DOES carry current, specifically the returning current through the home’s loads (ie. lightbulbs, tv’s, appliances, etc…). The neutral wires coming from the loads in a home’s breaker panel are tied to ground and the neutral wire coming from the secondary transformer is also tied to ground at the pole. Because neutrals are tied to ground, the Voltage potential from the neutral wire to ground is minimal. Power can be calculated by multiplying Voltage by the current (Amps). If there is practically 0 volts on a wire, then the power is going to be ~0 as well. **That is why it is possible for a person standing on the ground to touch a home’s bare neutral wire without getting shocked. It is also why the neutral wire coming from the pole transformer into a home is a bare conductor (no insulation). **If there are situations like lost/disconnected neutrals or grounds; ground faults where limbs of a tree touch bare high voltage wires; etc… then this statement may not always be true, it may be possible to get shocked. In summary, it’s about completing a path for current to flow, but also how much force (aka Voltage) behind the current flow; and it depends on exactly what two points in the electrical loop/circuit are being touched/connected in order to cause current to flow.

This is one of the best descriptions and explanations on the Internet. Thank you

Simple , Easy , Concise , Thoughtful . Thanks

Thanks for the video. First of yours I have seen and subscribed while watching. Very informative.

At trade school 40 years ago we studied the GM delcotron alternator.. the study materials called it the six sweeps of the alternator... which btw are all three phase... great video!

The conductors between a voltage source and a load are called lines, and the voltage between any two lines is called line voltage. The voltage measured between any line and neutral is called phase voltage. For example, for a 208/120 volt service, the line voltage is 208 Volts, and the phase voltage is 120 Volts.(9:32) EU: 230VAC => Phase voltage 400VAC => Line voltage.

Thank you for this very detail video.

This is one of the best explanations/animations I've seen.

@abdinassirmohammed1230

6 жыл бұрын

Kevin Butler Woow. This is absolutely superb explanation. But why have you switched off the save button

@raritaninc

6 жыл бұрын

How do I turn the save button on?

Brilliantly explained. Thank you!

Good vid. Memories refreshed

Thank you. This is the first explanation that has made it clear to me

This begins with faulty description of the effect of the north pole of a magnet rotating by a fixed linear conductor. Electrons do not flow towards the north pole of the magnet. According to Lenz's Law, the electrons in the conductor flow in such a direction as to oppose the motion of the passing north pole. That means that as the north pole approaches the end of the linear conductor, the electrons flow in such a way as to create a north pole at its end. As the north pole passes and receded from the conductor, the electron reverse their flow so as to produce a south pole at its end, to attract the receding pole. Lenz's Law is really a consequence of Faraday's Law of Induction, which states in mathematical terms that the direction the induced magnetic field is always opposite to the direction in which the magnetic field is increasing. The electrons in the conduction flow in the direction required to produce that opposing field. In the mathematical expression, the negative sign is what Lenz's Law expresses in words.

@paulfrischknecht3999

3 жыл бұрын

Absolutely, good point. I saw the same wrong explanation in other videos about AC...

@GunterPSparks

2 ай бұрын

Boring!

as an EE I want this video to be tough in colleges, it explains it perfectly , I want to go back to college, who would not want to be in college -all you have to do i study nothing else lol kids these days have it made with the internet, this is a great video, I watched it twice because its so well done, who ever did the animation I want them to do my power point stuff and make it like this

Super analytical & graphical explanation 👍

very simple and very good explanation as i have ever seen.keep going..........

Thanks for sharing your knowledge very informative, it inspired me to focus more making electrical video

An excellent explanation! Thank you!

One of the best explaination and illustration ive heard. Very clear. Thanks a bunch!

Best explanation ever.....Great work

Awesome very instructive all the confusing that i had for my whole life was cleared in your 10 minutes video Thanks a lot!

@user-qv6jz4mi6m

4 жыл бұрын

ΑΡΣΕΝΗΚΟΛΗΘΗΛΑ ΠΡΟΣΟΧΗ ΤΗΣ ΔΙΑΣΤΑΡΟΣΗΣ

Thank you about explanation on Three phase. It's really good. Congratulations!

this is the best explanation I have watched so far

@MystiqWisdom

3 жыл бұрын

Engineering Mindset is perhaps the best channel for this kind of stuff. This is also a good explanation.

Great video!

Very good very clear explanation, l have been looking at this stuff for years and for some reason for me it just takes one mind and l know......yippee....what a life ...does it ever puzzle you why we have to search for so long before we find the right answer ....why can't we get it straight away

@mikeymcmikeface5599

5 жыл бұрын

4:18 Why did the electrons stop in lines 1 and 2 even with the magnet rotating?

@coolkid9770

3 жыл бұрын

@@mikeymcmikeface5599 i dont think it does becuz only one line will ever be perpendicular to the magnet every time it rotates while the other two will be parrallel to the magnet

By far one of the best videos explaining three phase power.

very helpful... always wondered about 3-phase

Most enlightening video

Thanks for this great explanation.

Great explaination!

GREAT Explaining in simply terms. (inventor)

Good video! Dude sounds like a calm Ray Romano

Very well.explained .thank u

Errata: At 0:40, the sine waves are 60 degrees apart, but they should be 120. Magnets do not attract or repulse electrons. Varying magnetic fields cause electrons to experience a perpendicular force, which is why you need coils in a generator and motor, straight wires would not work properly...

I hope that you can make a video using three phase graph to educate rookie electricians about the danger of letting the phase wires to touch each other in electrical wiring, as three phase wiring nowadays is more popular for domestic electrical wiring compared to single phase

Very good explanation

thanks for this. I'm a recruiter and working with construction and 3 phase power is a huge plus for what I'm hiring for. Your videos do a great job explaining this to a layperson w/o the background.

@mikenewtonninja9379

3 жыл бұрын

you don't want a lay person without the background working on 3 phase, lol, lmfao, pmsl and ha ha. not unless you have a good Hoover to clean up the little pile of dust that will be left where he once stood 💥😵🌬💨👋

Nice quality video. Let’s see what else you’ve got.

Outstanding!

I've always been curious where 208v came from and this helped. Where does the sqrt(3) come from?

Best explanation of 3 phase.

Another, unmentioned, benefit of 3-phase power is that 3-phase AC induction motors are much simpler, not needing a shaded-pole device on the field windings or a special startup motor to get the principal motor started. A 2-phase AC induction motor, like an internal-combustion engine, can keep itself going but needs a separate device to get it started.

@rcadventure44

5 жыл бұрын

We don't use 2 phase. We use single phase, with 2 lines 180° apart.

@Bramon83

5 жыл бұрын

Common misnomer.

@davidjames1684

4 жыл бұрын

True (sorta). It is actually 2 phases, but they are phase locked 180 degrees apart and we have access to the 2 hots and that center tap. So in reality, it is a combination of both single and double phase. Imagine if someone had 2 lines each 120V and each having a neutral center tapped to the same transformer's secondary winding. Next imagine if they could put say a 45 degree delay in one of those lines. Would it then still be single phase or 2 phase? If 2 phase, then you are saying that when 2 lines are 180 degrees apart it is single phase but is it really? Some people would agree and some would disagree.

@hellwithit

4 жыл бұрын

Brightwriter also you can reverse direction on it

@junkdeal

4 жыл бұрын

If the starter winding is out or the centrifugal switch is non-functional, you can hand-spin a single-phase motor and it will run both ways. We had a bench grinder with a failed "cent" switch that would have sent power to the start winding. I put a momentary-contact switch in the start circuit, and then at the moment I would turn on the grinder I would push the added switch until it got up to speed, and then let that switch go and all was well! It we didn't hit that switch the motor would howl and not turn. If I hand-spun the grinder wheel backward and then did the other steps before it stopped drifting backward it would run in the wrong direction! Also, if I am not mistaken, the 3-pase motor was invented first, and it was supposedly a battle to make an effective single-phase motor after that.

LoVE It!! Thank you for sharing you knowledge and explaining it well

@mikeymcmikeface5599

5 жыл бұрын

Would have been better without the crappy distracting music!

@-danR

4 жыл бұрын

I gave up at 1:44. He doesn't have a clue how fluctuating magnetic fields induce an electric current.

@thedeterminater8757

4 жыл бұрын

@@-danR could you explain what's wrong? I'm not be facetious, I'd genuinely like to know what was wrong.

Excellent video

Great job, keep up

That's exactly what I was taught in the apprenticeship classes at Davis Electric. We didn't have animated video available to us.

@kenmichael2888

3 жыл бұрын

S

@robbenmitchell7949

3 жыл бұрын

Did you ride dinosaurs to school?

I had trouble understanding 3 phase but i instantly understood what you were saying & why ac asalates

You have made it so easy to understand. You're such great teacher 👍👍👍👍

सर आपका वीडियो बहुत बढ़िया और शिक्षाप्रद है. 3 फेज एसी को आपने अच्छी तरह से समझाया है.

LOVE THE CHANNEL YESS.

Fascinating. Thank you.

Great analysis

Nice job. Working as an EE in the power field for 40+ years its always been easy for me to understand but difficult to explain to laymen....especially on a napkin with a pen. 😊

very educative. Thank you regards

good video the way the narrator tries to go slowly through the material to make sure it gels and gets absorbed. Sadly at this point in time there are 333 dislikes meaning there are 333 confused people out there still scratching their heads with a bewildered look on their faces.

Nice explains. Thanks regards

Great Video..

Mr.Raritan Thank you so much Your video is one of the most excellent explanation animation videos again I greatly appreciate your video I would like to upload animation videos Of synchronize rotating machines induction motors, Generators I hope so look forward to hearing from you Thanks again

you talked about other videos to watch but they don't seem to be available on the website or youtube , how do you get access to these ?

thank you so much i loved everything yet i still have a question, how does the delta 3 phases works? and what is the diffrence between these two ?

@Dragon-Slay3r

Жыл бұрын

Two is clean

Practically all automotive alternators are three phase, when rectified, the ripple voltage was less that 8%, single phase is 100%, no need for huge capacitors. Ideal in plants when AC had to be converted to DC. Three phase motors were very efficient. Three phases 120 degrees apart inherently generated a rotating field, without capacitors so motors could be made much smaller. Wish we had three phase in our homes especially for air and refrigeration compressors and fans.

@brlinrainf

Ай бұрын

for people who might don't understand this comment but will understand after this reply: 1 phase ac motors are actually 2 phase, since 1 phase would be impossible to synchronize. in order to get 2 phase from 1 phase, you would need a capacitor 2 phase electricity has a sine wave with 90 degrees offset from the first

Thanks brother I appreciate your help with this knowledge I'm said from Zanziber in Tanzania how can you please help me with this knowledge

Very good, thank you.

best explanation ever

Sir any video on phase sequence and detailed discussion on Star and delta connection in Power Transformer

Please explain 12 phase used in electroplating.

Thank you.

I'm Very Pleased To Watch This Video And That I Can More Understand Its Explanation With The Writing if, My Advice.

so is the combined output modulating or are the phases so closely synchronized it remains steady?

Very nice & useful

Data centers, and other commercial and industrial buildings don't necessarily use 3 phase power because of less amperes; it is because 3 phase power provides a "more balanced system". Such buildings demand more power than dwellings even though dwellings are served with lower voltage power.

What about 3 lines carrying 120 Volts each? Is there more than 208 Volts being supplied in that circuit?

Excellent

Cleared and satisfied

i get some knowledge about 3 phase.tq

Thank you

Good job

If we count the postiive portion of the sine curve , only can see the 2 phase add together , Right ?

At 4:48 the wave forms are not 120˚ apart. I thought that you did not understand. Later on you make it clear that you do. I knew that 3 phase had something to do with generator layout. You made that clear.

Explanation is quite good enough but the rotating magnetic field is generated after current passes we should not place magnet before to understand this that makes it complicated.

Really one of the best explanation but what is r3 ??

@jovetj

5 жыл бұрын

The _radical symbol_ *√* is NOT an "r"-it is a mathematic symbol. *√3* means _the square root of 3._ Or, _3 to the power of_ ½. *√3 ≈ 1.7320508075688772935274463415059*

So the odd number is essential for continuous current?

It's just how the AC power is transmitted, it's 120 degrees out of phase from each other. The magnet is the generator that is generating the power i.e. Hydro-electric Turbine at a Dam.

@javierortiz5137

3 жыл бұрын

You are correct, but in most cases the generator is moved with burned fuel.

WONDERFUL

Is there a video showing what happens when one of three phases goes away?

good explain....

Had to watch 9 mins to find out why a data center would want 3 phase power. But hey, it's cool, I learned something along the way.

You suggest that electrons are attracted / distracted by a magnetic field. That's wrong. It's the changing magnetic field that causes an electric voltage in the coils.

@yaz2928

5 жыл бұрын

Lenz law, basic electromagnetism.

@mikeymcmikeface5599

5 жыл бұрын

The waveforms at 4:50 and 5:25 look totally different. Why is the first one asymmetrical, as if the waves are grouped together? Just a crappy animation?

@-danR

4 жыл бұрын

9 out of 10 comments are praising this video's claptrap. Unbelievable.

@joshbachman7706

4 жыл бұрын

I was thinking the same thing. Anyways, most modern three phase industrial motors are induction and controlled by some kind of VFD.

@dogwalker666

4 жыл бұрын

@@joshbachman7706 indeed Industrial inverter drives are brilliant for matching speed matching ramps or current limit I have fitted thousands from 0.05kW up to 3000kW fun days.

Superb !

I was hoping he would talk about how the Utility people go about routing Three Phase power through a town, versus how they go about routing more ordinary 220vac Single Phase power around a town.

Almost all of my higher voltage "Data Center" equipment (Printers, CISC based CPU and HD Racks) required 240v as standard. When we relocated and the power company could only supply 208v to our facility we had to have the manufacturer come out and make adjustments to operate on the reduced voltage. At least now I think I understand where the 208v came from, but why is 240v 3 phase standard for so much of the older, heavier equipment and household appliances such as stoves and dryers?

@Nunya_Business_

5 жыл бұрын

Because there was/is a common configuration that is 120V to ground on 2 legs with a stinger leg which is 208V to ground. They are 240 delta with a center grounded winding, quite common where I live. Your company probably could have bought a transformer.

Can it be posible to have 3 phase panel with 220 v in heach line? Can someone help.

@Inflec

5 жыл бұрын

+Jorge Cervantes - Yes, certainly it's possible but it's not a common scheme, at least in America. 220-240 volts 3 phase *is* common in Europe and most other parts of the world. The closest scheme in America to your question is the 277/480 volt 3 phase system used in factories and large installations.