3 Phase: Star Connected Loads, How to Calculate Line and Phase Voltage & Line and Phase Current

[@nickl4855]

I wish my professors would demonstrate things the way you do

[@TurnerN4tor500]

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

[@no_short_circuit]

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"

[@JoeRobinsonTraining]

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!

[@Cary581]

Excellent!! If only my university teachers explained this as well as you did! All of your lessons are 10/10. Thank you very much

[@augustinematthew2055]

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

[@PunmasterSTP]

Star connected loads? More like "Superb, creative uploads!" Thanks again so much for making and sharing all of these great resources.

[@YangobingYana-d6r]

If only my professor could explain this way. Thank you sir.

[@Mrgrt616]

Thanks

[@JoeRobinsonTraining]

Aw, thank you so much for the gift, it's much appreciated. 😊

[@munafmufc01]

What a brilliant explanation. Thanks J

[@MrDangadave]

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.

[@JoeRobinsonTraining]

Thanks for the kind words. More content planned so stay tuned for more especially if you're starting level 3!

[@PunmasterSTP]

How did your studies go?

[@heyneedhelp8266]

@@PunmasterSTP no reply means it probably went down like london bridge.

[@PunmasterSTP]

@@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!

[@dankjane7123]

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

[@JoeRobinsonTraining]

You are so welcome! Check out my playlists for for more information. 😊

[@nolezosa8912]

Very extensive explained. Thanks for sharing you knowledge to us. Godbless.

[@JoeRobinsonTraining]

My pleasure, thanks for commenting. 😊

[@garrygriffithselectricalse843]

Great video Joe 👍

[@colinteoh3230]

This is the best explanation out of all the others.

[@MimiTai677]

The triangular and the one that uses vertical and horizontal components are the ones I like. Thanks Joe.

[@GSHElectrical]

Wonderful content 👍

[@SteveW6SJK]

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!

[@leahStl-zp9yu]

This Video is so helpful. Thank you Joe

[@idontknow8505]

Thank you man,have a marvelous day

[@galinayankova3799]

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.

[@leovicky7]

very well explained... liked particularly your point ... phase voltage =voltage across load...

[@kyras8198]

you my friend are indeed amazing

[@usearsive]

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

[@kihelsifeddine7802]

Thanks Joe for the video.

[@electrodellinstallations556]

Fantastic video and explains the relationship perfectly with voltage and current.

[@JoeRobinsonTraining]

Thanks very much matey. 👍

[@michaeltay7772]

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.

[@JoeRobinsonTraining]

Thanks very much, stay tuned!

[@michaeltay7772]

@@JoeRobinsonTraining I 'm all yours all the time

[@suvrasengupta2840]

The best so far

[@timothylyons7399]

Very helpful. Thanks

[@JoeRobinsonTraining]

Thanks for watching and commenting, stay tuned for more!

[@ee27arkadeepmukherjee30]

I wish my professor were like you

[@JoeRobinsonTraining]

You're very kind, thank you. 😊

[@nickpierpoint4116]

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

[@JoeRobinsonTraining]

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. 👍

[@PunmasterSTP]

How has your plan been going?

[@micoarevalo5072]

Hello, this really helps me a lot. keep it up

[@ghermanncorneliu6657]

Thank you so much for this is true gold

[@JoeRobinsonTraining]

My pleasure, glad it helped. 😊

[@ASMR_relax24]

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?

[@jackninnu9719]

Great as always 👍

[@JoeRobinsonTraining]

Thanks Jack.

[@SilverthorneA27]

@joe I thought if you measured voltage across the same line it would be zero? Does it change across a resistor?

[@chajsni]

omg thank you so much!

[@kruizemcfarlane6090]

Very informative

[@JoeRobinsonTraining]

Thanks!

[@gooddeedsleadto7499]

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? 👍👍👏👏

[@simonabel6869]

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.

[@JoeRobinsonTraining]

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.

[@coatechnics2676]

Japolo !

[@bobbrumley3964]

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.

[@johnjohn-ne8fw]

Thank you. I've subscribed and 👍

[@edgarelevadojr.3181]

Thank you, sir!

[@fgh7832]

Great example!

[@fgh7832]

I was researching what a star and delta is and I learned much more. Thanks! 🙏

[@JoeRobinsonTraining]

Great to know Frank, thanks for commenting. 😊

[@ankitgupta1344]

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

[@JoeRobinsonTraining]

Hi Ankit, check out this video, hopefully it'll answer your delta question! 😃 kzbin.info/www/bejne/baTPdHt9pct7qsk

[@ankitgupta1344]

@@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.

[@kgosistalin4399]

You are the best 👌 👍 👏👏🔥

[@AyeshDumindu]

Thank You! 👍

[@JoeRobinsonTraining]

You're welcome!

[@JohnnyApples33d]

Great video!!

[@JoeRobinsonTraining]

Thank you!

[@sachiootsuka]

your videos are awesome!

[@femiagunbiade7967]

Nice job!

[@any_one4255]

Nicely explained practically... Not just on pen and paper... Thanks

[@JoeRobinsonTraining]

You're welcome, glad they're helpful!

[@gooddeedsleadto7499]

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. 👍👍

[@tshihlothobejane170]

YOU THE BEST SIR

[@khalifahshakur12]

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!

[@smonetus]

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

[@JoeRobinsonTraining]

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. 😊

[@modyalriyami]

i hope you see this. Thank you for real 🔥💪

[@JoeRobinsonTraining]

You're welcome. 😊

[@mumbaiverve2307]

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 ?

[@colingill9317]

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.

[@jitendrasah2668]

Sir, how I calculate 3 phase induction motor star connection and delta connection amp

[@H-H1117]

Thank you 🙏🏻

[@JoeRobinsonTraining]

You're welcome!

[@adebayoagbaje]

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?

[@JoeRobinsonTraining]

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.

[@udeshkumara1329]

very nice.

[@JoeRobinsonTraining]

Thank you!

[@gazdkw82]

Little repeat glitch after the first whiteboard section. Also, when you measured phase current and line current, were those loops both just phase current ?

[@JoeRobinsonTraining]

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! 👍

[@kevin00861]

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 ?

[@joashowusu-ansah9923]

thanks so much!

[@patrickjacobsen7805]

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.

[@godfreyndionei9054]

Thank yu Mister

[@kruzzah]

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

[@bobbrumley3964]

Total load in amps is always expressed for each phase not the sum of all phases. Total load 100a means 100a capacity.

[@kruzzah]

@@bobbrumley3964 thanx a bunch 🙏

[@bobbrumley3964]

@@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.

[@kruzzah]

@@bobbrumley3964 Got it 👍 n thanks again

[@EngKeen_KEN]

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.

[@EngKeen_KEN]

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?

[@knowledgegod2635]

Hoping this will help me understand the theory behind electricity for college. Pray for me.

[@bobsmith3291]

So what is better star or delta?

[@tom56ize]

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?

[@tom56ize]

Also, if you combine two phases, does that mean you can pull double the amount of amps?

[@bobbrumley3964]

Rated amps is per phase whether your single phase or three phase.

[@bobbrumley3964]

When you say power that is a different thing. Power is the sum of all phases.

[@gooddeedsleadto7499]

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?

[@nandakumarcheiro]

Phase resistsnce / line resistance 6/3 that is 2 accordingly must be recognised please along the star connection

[@serjerzemin]

Those measured voltages are the peak voltages, right?

[@aniqkasyfi2656]

full circuit diagram from supply please

[@rishikeshsali4753]

As load is Resistive, the Resistance is about 3.3k ohm right ?

[@gmbs360]

Glitch in the Matrix between 10:29 and 11:00 😉

[@elonyao3894]

I've never seen such a long probe

[@2jwrld820]

I completely understand this, but my question is where we apply this, in terms of the real world.

[@JoeRobinsonTraining]

It's really about understanding the nature and principles of the three phase supplies that feed large installations in the UK. 👍

[@himayatjanjhi6470]

Where does √3 come from??

[@MrSocialish]

Right? No video that I've watched so far has actually mathematically derived this.

[@nicobriceno732]

Amen

[@Anjanam87]

I need job outside India can u help me I am an electrical engineer. (EEE)

[@wallbouncer9655]

👍🏻⭐️⭐️⭐️⭐️⭐️

[@ahmednor5806]

🙏🙏🌹🌹🌹🌹

[@ludak357]

wait but you don't need a "N" in the star connection

[@waynemeierdirk]

Delta connection is a extremely dangerous

[@jerrymapumlo9695]

Y?

[@charlesdorman368]

O009 IyI