Percent Impedance of a Transformer

This video covers the basics of everything you need to know about %IZ of a transformer including how to find it using a short circuit test and performing short circuit calculations.

Intro
1:12 Short Circuit Test to Find %IZ
4:46 Short Circuit Current Calculation

#Transformer #%IZ #Impedance

[finn]

I had so many lightbulb moments watching this, you explained it better than anyone has

[kevinhann]

Zack, I'm a Chartered Electrical Engineer and Technical Director for my company providing HV designs up to 132kV in the UK.
I also provide training. Can I just say that your video is excellent. I was going to produce my own you tube presentation on this for internal training but I think I will just refer people to yours. No wasted words, no BS, no patronising explanations. 10/10. well done. I'll look at your other videos.

[lowellweeks]

I haven't had to do these calculation in over 25 years. WOW Brilliant breakdown. Everything just came flooding back. Kudos!

[TIGREinVOLO]

Ok... first of all... you are genius. The set up you arranged with "black" board in reverse is a brilliant idea. For many reasons. On top of this, your explanation is simple and clear! Thank you

[maxgiantbanana]

Mr Hartle, this video is truly the best explanation of one of the foundational principle of transformer…thank you so much for sharing it

[abdelmalek]

You're a hell of a teacher love you maan

[yilehuli]

This percentage impedance along with the transformer voltage determines if the maximum fault current could be handled properly by the breakers. The bigger the transformer, the lower the percentage impedance.

Good video.

[MUTHU_KRISHNAN_K]

Wow,
Thank you very much for this amazing explanation.
Understood crystal clear 🙏

[douglaslloyd]

Such a satisfying and helpful video, thank you so much!

[LifexLess]

Great video! Love the explanations, drawings, and blackboard. Cheers.

[Danilo]

Amazing … thanks for the excellent explanation

[brendonshewchuk]

Thanks! Just got me an extra mark on my 3 phase exam!

[BlackLeg]

Hey i know you posted this a while ago but i have a questions im stuck on where a 250mOhm is added to the secondary and i need to find my interrupting rating. How would i do that?

[monampuan]

Sir can you make video for 3phase metering installation with ct and pt

[Jnglfvr]

It appears that the short circuit current can simply be calculated by realizing that if the current on the secondary is 37.5 A with 20 V on the primary then the current is (600/20)*37.5 = 1125 A when we have 600 V on the primary. (Ohms law). Your result was slightly different because of rounding error %IZ.

[PaulAzevedo-sv]

Hello you mentioned in this video you can calculate losses of the transformer with the % impedance. How do you do that?

[expnnt_designteam]

How do you consider %Z of a bank of three single phase transformer for
3 phase use ?

[wokeclub]

Loved it.. Great explanation
Could you please let me know the logic behind the formulae you've used ..
For e.g: why should the short circuit current be equal to the rated secondary current divided by the percentage impedance?
Many thanks .. subscribed!

[TFeld-nxio]

Are any factors, such as sqrt(3), needed if you have a 3 phase transformer?

[turdfurguson]

Could you explain where you got 20 volts. Seems like you just picked a random voltage? Did I miss something?