Hope all went well with the test. Im going for my 4th year/ inter provincial in like 5 weeks. Forgot everything from the year previous, this guy is a life saver!
Absolute fantastic explanation and drawing. I usually rate anything either good, very good, or wonderful. For me to use fantastic as a rating is truly exemplary. A thank you to you.
Only small suggestion would be to put that Delta Wye drawing back down at the bottom of the screen. A visual reminder of what we are looking at. Thank you.
I really learnt so many basic concepts from your videos, Thank you for making this so easy to learn i got one question for you Suppose if i have to design one transformer and i have to select WIRE SIZE on primary side so what should i consider for Amps by Phase current or Line current( if primary is Delta)
Thank you for watching and for your kind words! For your question, with a three phase delta connection we would use the line current for calculation purposes. This can be derived from the KVA rating divided by (Line Voltage x √3). At this point you would multiply by 125% to determine the calculated load of the required conductor to size (respecting termination temperatures). Hopefully this answers the question for you!
@@schulerruler Thank you for your clarification 😊 and i really don't want to bother you again but i have one more question for you because i tried everywhere to find the solution but couldn't find it. Question:- Suppose To design a transformer with 5KVA and Primary has to be 380/240 Delta and secondary 208 Volt Delta. P.S:- Primary is just single wind of 380 volts with 240 volts tap on the same wind (No other winding) which both gives 208 volt in secondary. So is this kind of design doable or not doable? i have attached the link for question below:- ruclips.net/user/shortsqsny1uzBgI4?si=sDx9LqocwwGw-crt
It's actually just tempered glass, with LED strip lighting around it. Then the camera inverts the image so it doesn't appear backwards. I'm not actually left handed haha.
Good day. Love your videos. I just want to find out as I am still studying and learning it all. I have a 3phase transformer. 600V 75KVA 72.2A primary. Which will be 75000/600√3 = 72.2A. Then I have a 208/120V 208A Secondary. And to get that it is 75000/208√3 = 208A. Why is this like this and not 75000/120? Thank you. Its a Three phase General purpose transformer. Thank you
Dividing 75000 by 120 would give you the phase current in this system, which in Wye is 1.732 x smaller than line current. So you incorporate the x 1.732 into the equation while doing it instead.
Can you please tell me how to calculate, the fuses in the primary for a transformer 600 volts, 3 phases, 75 KVA? Primary Delta and secondary Why. Thanks.
Excellent video. I am a teacher for the IBEW JATC in Rochester NY. We recently went virtual and I would love to use the white board system you have. Could you please tell me how it works? Thank you.
Hi Mark, sorry for the delayed response. This system is called a light board. It has led strip lights around the outside of a short of tempered glass, and the camera inverts the image as we write on the back of the glass.
Hey man I just did my masters exam. 2 questions were asking for the minimum interrupting current of a tx they gave tx size and voltage also impedance . Do you know how to calculate that .? Thx
I have a configuration where my service is 120/240v 3 phase delta coming in (grid). I will be hooking up a generator to this and synchronizing. I can configure my generator as wye or delta and adjust the voltage to match grid. I am thinking of configuring the generator in delta and tying it to the grid. What I am concerned about is the neutral. On the service side the neutral is hooked up to ground. On the generator side I don't need a neutral even though I can center tap one of the legs. Do you think I should forget about the neutral on the generator side completely? Will it pose a problem if I center tap the appropriate leg and hook up the neutrals? thanks
What if you change primary delta to wye? Voltage between H1-H2, H2-H3 and H3-H1 would be 600, voltage between H1-N, H2-N and H3-N would be 346. On secondary end L1-N voltage of 69 and between phases of 120V, correct? The transformer is 1:5 - as in its original form it goes from 600V to 120V, correct?
Yes, by changing to eye on the primary your phase voltage applied to each coil would be reduced by root 3, inducing root 3 less phase voltage on the secondary as well. Meaning now you would have a line to line of 120 on the secondary as you've stated!
What you're doing by connecting them like this (delta) is increasing the deliverable capacity. As long as transformers are well matched (impedance, %iz, voltage regulation) then no unwanted circulating currents will be present, which would cause the excessive heating condition.
Good morning , for the 3 transformers installation in Delta to have the high leg, please, can you tell me if all 3 transformers must have same Power output ?
When talking about full load amps for single phase transformers or a 3 phase transformer we express what each line conductor can deliver. We never add all the phase currents up for total output.
Adding up the apparent power of each phase (when balanced) will determine total output, or ELine x ILine x √3. Definitely do not add up the phase currents.
If the line and phase currents in a wye configuration are equal, why can't you divide the secondary total VA (150000) by the secondary line voltage (208) to get the secondary current value? Shouldn't both equations give you the same current value? Thanks!
Thanks for watching and commenting. Check out my video ruclips.net/video/aFZyhiCnicQ/видео.html It walks through how the three phase power formula is derived. From there we establish the transposed formula for individual line current : line current=total va÷(line voltage × √3)
Depending on the secondary side of your transformer (single winding 220v, or multiwinding with 110/220 available) you would still apply the same methods. A delta secondary would still yield same phase/line voltages, while a wye connected secondary would yield a 1.732x higher line voltage than phase voltage.
I'm currently studying for my electrical Masters, and dude if I don't blow my brains out it'll be because of your videos. Thank you for making them!
Haha I'm happy they are helping! I almost hit a wall when I got mine but I pushed hard and finished. You'll get it and it'll be worth it!!
Hope all went well with the test. Im going for my 4th year/ inter provincial in like 5 weeks. Forgot everything from the year previous, this guy is a life saver!
@@enriquecorrea5932 Yup, Passed first try! Started my own company, and just hired my first employee. Never stop grinding!
@@enriquecorrea5932 good luck on your Red Seal! I'm sure you'll crush it bud!
How incredible the invisible whiteboard is almost distracting my brain it’s so satisfying!
Awesome video
Currently in my Third year of school and honestly your videos are incredible! So simply explained and extremely helpful! Thank you!
I'm happy they are helping. Thanks for watching and commenting! Good luck in third year.
this is the best tutorial i've seen
Thank you
Thank you for the encouraging words!
Can we also all appreciate the he's writing backwards for everything... unless its a trick with the cameras... Very impressive and great tutorial!
I'm pretty sure they just flipped the video back to front
@@bartimaeu1 I forgot that this could be done, thats probably what they did.
@@OrgGlobeRider probably
Orrrrrr did we?!?! 😉 Yeah, no, that's what we did.
@@schulerruler the content was good already but that would have blown my mind 😂
The problem I had to solve was a little different but your explanation helped me solve it, thank you!!!
i am a jman electrician back in electrical tehnologist school. thanks so much for the refresher! super helpful!
Absolutely. I'm happy it was able to help you.
I would like to thank you for making an educational video for electrical..this is useful...
GOD THANK YOU! I was struggling with this stuff and it made things so much easier. Thank you.
Happy it helped! Thanks for watching!
Fantastic explanation
dude, you're, low-key genius !!!, ima scribe!!!
Thanks for the support!!
Explanation is really really good.
Thanks for the encouraging words!
How clean he writes...
Absolute fantastic explanation and drawing. I usually rate anything either good,
very good, or wonderful. For me to use fantastic as a rating is truly exemplary.
A thank you to you.
Only small suggestion would be to put that Delta Wye drawing back down at the
bottom of the screen. A visual reminder of what we are looking at. Thank you.
Very simple and clear explanation.
I really learnt so many basic concepts from your videos, Thank you for making this so easy to learn
i got one question for you
Suppose if i have to design one transformer and i have to select WIRE SIZE on primary side so what should i consider for Amps by Phase current or Line current( if primary is Delta)
Thank you for watching and for your kind words!
For your question, with a three phase delta connection we would use the line current for calculation purposes.
This can be derived from the KVA rating divided by (Line Voltage x √3).
At this point you would multiply by 125% to determine the calculated load of the required conductor to size (respecting termination temperatures). Hopefully this answers the question for you!
@@schulerruler Thank you for your clarification 😊 and i really don't want to bother you again but i have one more question for you because i tried everywhere to find the solution but couldn't find it.
Question:-
Suppose
To design a transformer with 5KVA and Primary has to be 380/240 Delta and secondary 208 Volt Delta.
P.S:- Primary is just single wind of 380 volts with 240 volts tap on the same wind (No other winding) which both gives 208 volt in secondary.
So is this kind of design doable or not doable? i have attached the link for question below:-
ruclips.net/user/shortsqsny1uzBgI4?si=sDx9LqocwwGw-crt
@@schulerruler please share your thoughts on my previous comment , i need your feedback 🙏🏻
omg. this video is just what i been looking for. THank youuuuuu sir!
I'm happy it helped you! Thank you for watching!
thanks chris good reminder !!
Thanks 🙏🏼 you are great Teacher👍
Thanks for the support!
Excellent
This helped a lot. Thank you so much
what a nice job sir
Thank you!
Very helpful. Thanks!
Its a great video with good explanation. Can you please say how this kind of videos are made. Which software you use sir.
This is a glass panel side lit with LED lights that the camera is in front of. The camera inverts the image so it looks "normal" to the viewer.
@@schulerruler Thank you.
@@sravang4402 thank YOU for watching!
@@schulerruler May I ask what pens are you using please?
They are a florescent colored whiteboard marker. Some are a chalk whiteboard marker. I believe both are expo brand.
Thank you Good job
Are you standing IN front of a Plexi glass? Its cool how you doing this.
It's actually just tempered glass, with LED strip lighting around it. Then the camera inverts the image so it doesn't appear backwards. I'm not actually left handed haha.
Good day. Love your videos. I just want to find out as I am still studying and learning it all. I have a 3phase transformer. 600V 75KVA 72.2A primary. Which will be 75000/600√3 = 72.2A. Then I have a 208/120V 208A Secondary. And to get that it is 75000/208√3 = 208A. Why is this like this and not 75000/120? Thank you. Its a Three phase General purpose transformer. Thank you
Dividing 75000 by 120 would give you the phase current in this system, which in Wye is 1.732 x smaller than line current. So you incorporate the x 1.732 into the equation while doing it instead.
@@schulerruler Thank you
This helped a lot; thank you.
Thank you for watching! I'm happy it has helped!
Awesome video Chris
Absolutely excellent. Thanks
Brilliant Explanation!
Hello Sir.Please when given the voltage ratio of the transformer, how do I know if it is the phase voltage or line voltage?
Can you please tell me how to calculate, the fuses in the primary for a transformer 600 volts, 3 phases, 75 KVA? Primary Delta and secondary Why.
Thanks.
Excellent video. I am a teacher for the IBEW JATC in Rochester NY. We recently went virtual and I would love to use the white board system you have. Could you please tell me how it works? Thank you.
Hi Mark, sorry for the delayed response. This system is called a light board. It has led strip lights around the outside of a short of tempered glass, and the camera inverts the image as we write on the back of the glass.
@@schulerruler so you are actually writing with your right hand?
@@michael931 I am. I wish I was talented enough to write that fast backwards!
Hey man I just did my masters exam. 2 questions were asking for the minimum interrupting current of a tx they gave tx size and voltage also impedance . Do you know how to calculate that .? Thx
the secondary is also 3ph, so why there is no sqrt of 3 in the calculation in Isec?
would you please show what is voltage between H1 or H2 and X1 or X2. it was my question in exam (just the secondary was delta with ground)
excellent, thanks!
H1 stands for what ? Thank you
I have a configuration where my service is 120/240v 3 phase delta coming in (grid). I will be hooking up a generator to this and synchronizing. I can configure my generator as wye or delta and adjust the voltage to match grid. I am thinking of configuring the generator in delta and tying it to the grid. What I am concerned about is the neutral. On the service side the neutral is hooked up to ground. On the generator side I don't need a neutral even though I can center tap one of the legs. Do you think I should forget about the neutral on the generator side completely? Will it pose a problem if I center tap the appropriate leg and hook up the neutrals? thanks
great video. thank you
Awesome bro i like it
Thank you for the encouraging words!
What if you change primary delta to wye? Voltage between H1-H2, H2-H3 and H3-H1 would be 600, voltage between H1-N, H2-N and H3-N would be 346. On secondary end L1-N voltage of 69 and between phases of 120V, correct? The transformer is 1:5 - as in its original form it goes from 600V to 120V, correct?
Yes, by changing to eye on the primary your phase voltage applied to each coil would be reduced by root 3, inducing root 3 less phase voltage on the secondary as well. Meaning now you would have a line to line of 120 on the secondary as you've stated!
i love you dude
Need help understanding how a transformer in series does not explode....Thank you.
What you're doing by connecting them like this (delta) is increasing the deliverable capacity. As long as transformers are well matched (impedance, %iz, voltage regulation) then no unwanted circulating currents will be present, which would cause the excessive heating condition.
What are you calling "s"?
so why do I not have this kind of teacher at high school ???? i understand it so well I don't have to watch it again
how much would the total power be if it were a star-delta or star-star connection if each is 5kva
Good morning , for the 3 transformers installation in Delta to have the high leg, please, can you tell me if all 3 transformers must have same Power output ?
They can be different VA ratings, but must have same voltage and percent impedance.
Thank you!!!
You're welcome! Happy it helped.
Question, in this case is this transformer able to handle a secondary total output of 125.01A (41.67x3)?
You would be able to deliver 1.73 × the current delivered by each phase (secondary coil) when connected in a three phase Delta configuration.
When talking about full load amps for single phase transformers or a 3 phase transformer we express what each line conductor can deliver. We never add all the phase currents up for total output.
Adding up the apparent power of each phase (when balanced) will determine total output, or ELine x ILine x √3. Definitely do not add up the phase currents.
So in this example, does I primary = I line = 14.43 A?
Yes that's correct.
If the line and phase currents in a wye configuration are equal, why can't you divide the secondary total VA (150000) by the secondary line voltage (208) to get the secondary current value? Shouldn't both equations give you the same current value? Thanks!
Thanks for watching and commenting.
Check out my video ruclips.net/video/aFZyhiCnicQ/видео.html
It walks through how the three phase power formula is derived. From there we establish the transposed formula for individual line current : line current=total va÷(line voltage × √3)
Just remember when it comes to 3 phase formulas you always multiply the line to line voltage by 1.732.
I just did it and I suppose u could as long as u multiply 208 by 1.732 first them divide 15000 by that it will give u that same answer
What dry erase board do you use??
It's actually just a side lit glass pane.
When I do 15000va/600v x √3 or 1.73 I get 43.25. am I missing something?
You are missing the brackets around (600 x √3)
Should be punched in as 15000 ÷ (600 x √3).
I noticed that your wye connection is not grounded?
is that correct?
The common is the neutral and you can connect that to ground.
Sir, what if i have about 210/220V load how is the configuration and the calculation?
Depending on the secondary side of your transformer (single winding 220v, or multiwinding with 110/220 available) you would still apply the same methods. A delta secondary would still yield same phase/line voltages, while a wye connected secondary would yield a 1.732x higher line voltage than phase voltage.
Thanks sir
did you just explain all this by writing backwards?? whoa
That's what I want to know!!!
@@JoshZagorski He flips the video so that it looks right for us. Notice how he's writing with his left hand.
Aww man you ruined the magic! 😉
Is this guy writing backwards??
You are too much