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3 Phase: Star Connected Loads, How to Calculate Line and Phase Voltage & Line and Phase Current
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- เผยแพร่เมื่อ 17 ส.ค. 2024
- In this video we continue our journey into three phase electrical systems by looking at a star connected load. In a practical experiment we measure the line voltage, phase voltage, line current and phase current in the star connected system. We then look at the relationships between these measurements and find the all important number that connects theses values together. Stay tuned to the end for some exam hints and tips on this subject.
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#joerobinsontraining #Electricaltrainingvideos #scienceandprinciples
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I wish my professors would demonstrate things the way you do
For 3 years since I started level 2 c&g at college, I've never fully understood star and delta connections. Your practical demonstration has made the relevance clear in the real world. Thank you Joe, I'm subscribing
Thanks Joe. As a hobby in my retirement I've been studying all things electrical and watch many You Tube videos - obviously 3-phase has been a part of that learning. This video presentation produced a very welcome "light bulb moment" in my understanding. I have now added this link to my study folder marked "3-phase Star configuration"
Can't tell you how happy that makes me, it's nice to know that the material comes across in an understandable way. Never quite sure if I've explained things well enough when the videos go out!
Excellent!!
If only my university teachers explained this as well as you did!
All of your lessons are 10/10.
Thank you very much
Star connected loads? More like "Superb, creative uploads!" Thanks again so much for making and sharing all of these great resources.
This series is sooooooo helpful. I was confused after my yesterday's lecture, thanks to my proffesor. But with this series, everything is crystal clear
Wonderful content 👍
Honestly thank you for this I have my exam at the end of the month and I was struggling to understand but now i do
You are so welcome! Check out my playlists for for more information. 😊
Very extensive explained. Thanks for sharing you knowledge to us. Godbless.
My pleasure, thanks for commenting. 😊
Great video Joe 👍
Thank you, Joe you are a God send, I am doing my level 2 diploma and your tutorials are perfect. Please keep the vids coming and keep up the hard work, it is very much appreciated.
Thanks for the kind words. More content planned so stay tuned for more especially if you're starting level 3!
How did your studies go?
@@PunmasterSTP no reply means it probably went down like london bridge.
@@heyneedhelp8266 Possibly, but I’ve also heard from people after a while letting me know that they did really good on stuff. Though I can’t be sure, they sounded genuine. Either way, replying to old comments has become something of a hobby for me, and it’s led to some really cool conversations!
The triangular and the one that uses vertical and horizontal components are the ones I like. Thanks Joe.
you my friend are indeed amazing
Great just great relative to what I read 📚 it's so simply explained that I got it the furst time and I can't imagine getting confused anymore thank you.
If only my professor could explain this way. Thank you sir.
Nicely explained practically... Not just on pen and paper... Thanks
You're welcome, glad they're helpful!
Fantastic video and explains the relationship perfectly with voltage and current.
Thanks very much matey. 👍
This is the best explanation out of all the others.
Dear sir, really awsome, in last few weeks, I tried to make a rotary phase converter from single phase power supply, for a couple of time I was to start from beginning, since I am not an electition It was so hard to understand the concepts.
There are many items about making rotary phase converter from 2 phase power supply, but unfortunately I have to make one from 240 volt which a live line and an nature (L and N). Rigth now l have made some progress, but still I dont know how can I use the line voltage from an star connection , It would my pleasure to receive your comments about it, thanks a lot
Slightly advanced topic - you might want to show what happens to the current when you connect a single phase-to-phase load on a wye system. And other unbalanced situations in wye and delta systems. Just a thought. Thanks for all the hard work!
What a brilliant explanation. Thanks J
Thank you man,have a marvelous day
Very helpful. Thanks
Thanks for watching and commenting, stay tuned for more!
very well explained... liked particularly your point ... phase voltage =voltage across load...
This Video is so helpful. Thank you Joe
This is amazing, I really love your lessons and kindly would you also take us through the wire carrying capacity according to their sizes and how it's calculated. Thanks again.
Thanks very much, stay tuned!
@@JoeRobinsonTraining I 'm all yours all the time
omg thank you so much!
Thank yu Mister
Very good video mate I'm learning this stuff to challenge myself as I struggled with electrical in my level 3 course and dropped out, hoping to go back and get an engineering qualification, makes absolute sense the way you explain it
Ah, good to know thanks, hope everything goes well with your plans and check out the rest of my videos for more help with some tricky subjects. 👍
How has your plan been going?
What kind of the two types of connections (star, delta) do we use for AC generator, transformer, AC motor, automotive starters, automotive alternators, EV starter? & why?
Does an EV use an alternator to recharge the EV battery or the only charging source is electric outlet?
Starters on regular automobiles use AC or DC starter & why?
👍👍👏👏
Thanks Joe for the video.
Great explanation, but why is it the square root of 3. Is there a formula explanation of how this was arrived at. Great work, keep it up.
The best so far
Thank you. I've subscribed and 👍
Thanks
Aw, thank you so much for the gift, it's much appreciated. 😊
Could you please explain what happens to those currents and voltages when we start the motor using a star-delta starter. And how the circuit differs if it does?
You are the best 👌 👍 👏👏🔥
Thank you so much for this is true gold
My pleasure, glad it helped. 😊
Great as always 👍
Thanks Jack.
@joe I thought if you measured voltage across the same line it would be zero? Does it change across a resistor?
Could u also do few videos on PLC programming? Thanks
Because u make things easier to understand. I watched few of the videos from u, u make it simple to sink in.
👍👍
Hey Joe do you have a video explaining why this connection doesn’t cause a fault? 3 different phases bonded together forming a neutral in not understanding.
Thanks! Appreciate the vids!
Hello, this really helps me a lot. keep it up
Great example!
I was researching what a star and delta is and I learned much more. Thanks! 🙏
Great to know Frank, thanks for commenting. 😊
Star connection should be used for 220 or 440 volts (higher voltages) because star connection incorporates neutral line?
and
delta connection should be used before the line entering a home (lower voltages) because homes normally get 120 volts?
Homes Central air conditioning work on 120, 220 or 440?
Homes get 120 volts, the outlet for the condensation unit uses step up transformer for stepping it up to to a higher voltage?
How many volts Tesla or other EV cars use for charging?
Thank You! 👍
You're welcome!
Very informative
Thanks!
Phase resistsnce / line resistance 6/3 that is 2 accordingly must be recognised please along the star connection
i hope you see this. Thank you for real 🔥💪
You're welcome. 😊
Thank you, sir!
Hoping this will help me understand the theory behind electricity for college. Pray for me.
I wish my professor were like you
You're very kind, thank you. 😊
Great video!!
Thank you!
Thanks for the video. I think this 1.732 would apply only if the voltages on all 3 phases are equal. Do you have a video on relating between the line voltage and phase voltage in an unbalanced system with unequal phase voltages ?
YOU THE BEST SIR
Great video and in this 3PH STAR example each load draws 74mA, but how would you calculate the total amount of current drawn from your 3 phase supply? IL1, IL2, and IL3 combined
It's a good question. The average current would be zero because they're out of phase. However you only need to know the current in each line to calculate protective devices and cable sizes etc. 😊
Nice job!
your videos are awesome!
Hey Joe great vid.
Quick question :- in a balanced system can you leave the neutral out as all loads connect to one central point. I work on equipment with three heating element rated a 230v and I assume there wired in star but have no natural wire back to supply and the voltage is 230v across the elements.
Sounds like it is wired in star if they've got 230V across the loads. Not sure without looking at the regs but theoretically a balanced load doesn't require a neutral, you might have issues if the heaters click on and off separately or operate with varying currents.
Japolo !
If the voltage across the heating element is 230v and the voltage line to line 400v it would be wired wye. If the line to line voltage is 230v it would be wired delta. If delta there is no neutral.
Thank you very much for making this video. You have made it really easy to understand by putting up the practice rig. This topic confuses me but you have just simplified it.
Question: Why don't we measure our phase current immediately after the resistor just before the common neutral point. Will the phase current be same as the line current?
Hi Adebayo. That's a good question, I guess it would be the same right after the resistor, I'd need to double check that actually, very good question. But yes in a star connected load, line and phase current are equal.
I've a question, please Sir,
Assuming the load is 5kw & star connected with 380V line voltage,
Will the line current be the at all 3 lines ?
Sir, how I calculate 3 phase induction motor star connection and delta connection amp
thanks so much!
Thank you 🙏🏻
You're welcome!
full circuit diagram from supply please
How does ohms law justify the similarity of both line current and phase current. Or is this just a three phase law? Cheers. Awesome presentation.
very nice.
Thank you!
Amen
Hi Joe
I hope you are doing well.
If we connect the same load in Delta then what will be the line and phase current. In addition, also can you please confirm the total kw in both Delta and star connection for the same resistive load.
In case the current is different in both case then how can we size the cable.
Thanks
Hi Ankit, check out this video, hopefully it'll answer your delta question! 😃
th-cam.com/video/7slCHGpfHtg/w-d-xo.html
@@JoeRobinsonTraining Hi Joe
Thanks for your response.
I understand that you have used same resistance in both delta & star connection. So as per power formula, the total consumed power is less in star than delta. Please confirm. Can you please also clarify what will be the electrical parameter & stability of both system i.e. upstream transformer & load if remove one or two resistance in both delta & star connection.
As load is Resistive, the Resistance is about 3.3k ohm right ?
I've never seen such a long probe
Little repeat glitch after the first whiteboard section. Also, when you measured phase current and line current, were those loops both just phase current ?
Thanks Gareth, I think the glitch was where I removed a section of video and it seems the point that the phase current and the line current are literally equal (the same) has been put across! Stay tuned for more! 👍
I wonder if the star has 9 lines (9-phase), does the SQRT of 3 becomes SQRT of 9. Basically the SQRT of phase number? Thank you.
I take back my comment above as I have understood how it has been derived to be SQRT 3 for a 3 phase system
It is actually V-line = 2* V-phase * cos30deg .......3phase star configuration
For 9 phase star configuration would be V-line = 2* V-phase * cos10deg
Do you agree?
Those measured voltages are the peak voltages, right?
Glitch in the Matrix between 10:29 and 11:00 😉
Thanx Joe, nice simple clear clip for the subject.
But i have 1 question puzzling me, which is the total current we are getting from the 3 phase source for the loads connected to it. Will this be the sum of each phase current, whether it is balanced or unbalanced system? (same question goes for the delta system too)
Like if the source can provide max 100A for each phase in star connection, does it mean we can operate loads of 300A connecting 100A load to each phase? ... or will the source be providing only 100A in total for the 3 phases together?!
Appreciate your explanation to understand better,
Thank you
Total load in amps is always expressed for each phase not the sum of all phases. Total load 100a means 100a capacity.
@@bobbrumley3964 thanx a bunch 🙏
@@kruzzah I want to clarify myself a little bit more, you are correct that you could put 300a of load if you divided it on 3 phases that can put out 100a each. We would express verbally the source is good for 100a.
@@bobbrumley3964
Got it 👍 n thanks again
So what is better star or delta?
I completely understand this, but my question is where we apply this, in terms of the real world.
It's really about understanding the nature and principles of the three phase supplies that feed large installations in the UK. 👍
So theoretically, how many amps could you pull from a 3 phase system compared to a single phase system? So say you had a 3 phase source red ceeform plug rated at 415v line voltage. Is the rated amps meant as a total limit across the three phases, or can you draw the full amps from all three phases, so having three times the power?
Also, if you combine two phases, does that mean you can pull double the amount of amps?
Rated amps is per phase whether your single phase or three phase.
When you say power that is a different thing. Power is the sum of all phases.
👍🏻⭐️⭐️⭐️⭐️⭐️
I need job outside India can u help me I am an electrical engineer. (EEE)
Where does √3 come from??
Right? No video that I've watched so far has actually mathematically derived this.
Delta connection is a extremely dangerous
wait but you don't need a "N" in the star connection
🙏🙏🌹🌹🌹🌹
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