Transformer Action
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- Опубліковано 18 бер 2018
- Describing Transformer Action in the Primary and Secondary of a Core Type Transformer and the effect of load on primary current.
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Enjoying these videos. I've never seen transformer action explained that way. Very clear and helpful.
Great explanation, thanks for creating these videos. Keep up the good work.
I'm happy they help! Thanks for watching and commenting!
that was an amazing explanation, this channel deserves more views!!
Thank you for your encouraging words!
Thank you. That was very helpful.
Shouldn't flux direction be opposite according to right hand grip rule? From viewer's eyes, it seems that flux should go up the primary coil at first, not down the coil.
That is correct, but because it’s AC, the field direction is constantly changing, which makes designating any particular flux direction more arbitrary than anything.
There are two flux within any transformer that is in opposition. Lenz's law. The net magnetic flux in any transformer is almost zero but THEY ARE THERE.
this helped me out so much thank you!
Happy to hear that! Thanks for watching!
Hi ,
Very nice video , I liked your lecturing setup.
Can you make a video on how PT secendory open circuit is different from CT secendory Open circuit condition.
that was amazingly explained thank you
Thank you for watching!
If there is no squeaks are we really learning . AMAZING VIDEO !! and I like your play on words about exciting
Haha good question. The squeaks hopefully as to the classroom feel maybe! Thanks for the encouraging words!
Really good video, thank you
Thank you for watching!
if the secondary winding was wound in the opposite direction, would that change the polarity of the magnetic field on the secondary? If so, would the primary current be reduced with increased current on the secondary since the emf would add to the primary emf?
thanks for the vid mein
you're the best!
I was losing my hair trying to understand my textbook, thank you for explaining it simply.
Thanks for the supportive words! Glad it helped!
There's a way to stop secondary flux from going back to primary and then the primary won't draw more current when secondary is loaded.
I did few such experiments and uploaded the videos on my UA-cam channel.
Sup. There exists Markov transformer which simplifies things lol. But the position of the source and load are reversed when you check the video or patent. Maximum nullification of secondary mmf. Primary winding basically becomes an inductor so you will have to add capacitor in series with it
Do more questions from the CEC code book please
Very good explanation, Thank you
Thanks for watching!
No its not good, the flux in primary should be in opposite direction from our point of view
I am using electron flow (negative to positive) theory in this video, with the top primary terminal being the most negative at this given point in time. Plotting the magnetic field with the LEFT hand rule, you will find it is correctly labelled.
If conventional flow (positive to negative) were used, then the flux would indeed be the opposite direction.
If here is two opposite magnetic flux what induces eddy current?
Thank you
you are so good keep going
Thank you for your kind encouraging words.
The 1 dislike is someone who was absolutely SHOCKED by this explanation
My hope is a thumbslip haha.
Please tell me if I get this right: The less loops I do at the primary side the bigger the Exciting current will be? Because in my brain it makes sense if I add like a thousand loops, the magnetic field will be much stronger likewise much stronger to invert for the reverse polarity. Is there a sweetspot for a given voltage, or is "more is better" generally true?
If the wire you used had zero resistance, than probably yes. But in reality, the more windings you wrap, the higher the resistance becomes due to the wire, and resistance reduces current output.
unfortunately you didn't mention the primary excitation current is lagging the primary voltage by 90 degrees while the new flux created from the curret in the secondary is in phase with the induced voltage so there is no 'cancellation'. Rather an in phase primary current builds to cancel the secondary flux leaving the next flux in the core equal to the excitation flux
agree
Excellent presentation. I am A teacher for IBEW JATC in Rochester, NY. Our school recently had to go virtual due to COVID. Could you please tell me where you got your white board system and how it works? Thank you so much!
Hi Mark! Thank you for the positive vibes!
It is an LED strip around a glass pane, and florescent whiteboard markers. I can't take credit for the build but there are some good UA-cam videos on building your own. It is called a light board.
Last thing, you will need to flip the image either with the camera or through software.
Hope this helps, good luck my friend.
I am in the HVAC industry and have a question. On a basic 240 volt input 24 volt output transformer, I have higher primary voltage. It’s reading 250 volt on primary thus increasing my secondary to almost 30 volts ac. This is a standard 40vac part. How can I reduce the secondary down 3 volts? Thank you in advance for any response!
One method would be to place a dropping resistor in series with the load. Is there an option for a +/- tab on the transformer?
Sir how you build that write bord
What do you call a transformer that has equal number of turns on both the primary and secondary? i.e. input voltage/current = output voltage/current? There is step-up for secondary # of turns > primary # of turns, step-down for secondary # of turns < primary # of turns, but what's the standard term for secondary # of turns = primary # of turns?
This would be an example of an isolation transformer. Commonly these are used for safety purposes so that there is no reference to ground on the secondary. A short to ground on the secondary (provided there is no connection to ground) would result in a no short circuit condition.
@@schulerruler Thank you.
You are very welcome.
One question please
If the load increased will that increases the current in the primary coil ? Why?
Does it obey ohms law ? Thank u alot
Increasing load on the secondary will increase the primary current until saturation is reached. This is due to the fact that the primary flux is cancelled by the secondary increasing flux to simplify, allowing more current to flow in the primary.
@@schulerruler thanks and does the transformer aboey ohm's law ?
Thank u a lot 4 all the work ! And thanks for the fast reply
Your iron losses would correspond to the current flowing through the coils for sure. I've plotted the losses on a graph and it's an exponential curve.
I'm probably missing something but because of the right hand rule and the counter emf, shouldn't the I_secondary be the other way?
This was all done based on electron flow theory, which follows the left hand rule. I believe you are talking conventional or hole flow of using the right hand rule.
@@schulerruler ah yes, silly me the electrical engineering student. Thanks for the clarification!
Keep in mind that this rise in current is based on a subtractive winding, not an additive one.
Does the relative directions of windings change things?
Why is right hand curl rule not working here!? I'm confused a bit
The right hand rule is when you are using the conventional flow (positive to negative)method, whereas this is using the left hand rule with electron flow (negative to positive).
what marker do you use? It is good video.
Thank you. I believe they are Expo chalk markers.
@@schulerruler thank you
Sir. How you are writing behind the board but words still....
Your Voice Is So Slow In This Clip But That Data Was Best Of best
Do you write backwards or the video is mirrored
It is a mirrored video! Good catch!
I was incredibly impressed by the backwards-writing for one sec until i realized: No way hes writing that clear backwards this has to be mirrored :D
If here is two opposite magnetic flux, how can eddy current exist. Exciting flux will create eddy current in one direction, and secondary flux will create eddy current in opposite direction. So here should be no eddy current.