Harmonics: What are they, why do I care, how do I solve?

How can I download the slides? Is there any book or article I can read and learn more?

Good Video!

Recent disasters due to harmonies

I enjoy Chris Pratt talking about harmonics.

ABB means please

Retired from a large hospital and never know they are held to a tighter voltage distortion. Had hundreds of drives from 3 to 1750 HP and our great start up tech said that we were the only place that had equipment on line side & load side of most drives dealing with harmonics and voltage distortion. About 5 years ago at an IAEI class they said Japan is experimenting with supplying DC panels to large buildings. This would eliminate the need for rectifier and cheaper power supplies to equipment and reducing air conditioning loads. Think they hope to save at least 5% over all between power & AC savings.

Two things: Do 18 pulse VFD'S produce or handle harmonics better then they standard 6 pulse drives? Read some where that some cheap cheating china LED'S have a low power factor as low as 0.5 . Do such low power factor LED''S produce more harmonics then one say above 0.9 PF?. Tech from two separate drive companies said to stay away from 18 pulse drives but we have a lot of them in a new 12 story building ( all drives 30 HP & higher have 18 pulse drives except for soft start on 200 HP fire pump ). Do the newer think they are called active line reactors with their contactors & capacitors much better then plain Jane line reactor? Thanks for nice vid.

Nice topic
Will you please describe effects of non linear loads on DG sets as when ever I operate non linear load from grid to DG lod has variation in kw but still incoming DG voltage was not so varying

good nice

Power factor and voltage drop. If these are acceptable I don't give a damn for harmonics

Very good and simple for understanding thank you

Thnks!!

Very nice presentation. Thanks

Great video. Neat and articulate.

Hi Jeff, I like youe lecture

Kirchoff's laws got you awake at night? Search for androidcircuitsolver on google

Great Video, Thank You

You're camera guy sucks, I didn't see a damn thing you were pointing to.

Jeff really great and informative video, just recently had to sink my teeth to all of this information dealing with harmonics and this was a great video explaining some of the main concepts. Keep up the great work!

Thank you very much this very important lecture about harmonic i really like this lecture

And how do subharmonics work?

Do you recommend to avoid VFD operated large chillers in data center application?

Thanks for this superb presentation. As an electrical engineering undergrad, I had some doubts regarding harmonics and its effects. By the end of the video, I learned something.

Thank you very much for uploaded this..

How are you determining Voltage distortion by looking at the current waveform. In the begining you explain the calculation for ITHD then magically 30 seconds latter in the transformer comparison slides you come up with a voltage distortion value with no explanation of how you got it

I was thinking 70 + 20 = 90, Today I learn 70 + 20 = 72, and it responded to all my THD Math I knew before :)

Nice presentation but we are more interested on what he is explaining. Now you guys are showing more of him instead of the slides

Please be noted that Higher capacity transformers has comparatively Low impedance but not the higher impedance and that's why it exhibit low voltage distortion against same harmonic current Bcoz V=ZI , so less the Z, less the V@same I .
In the video you stated that higher capacity transformer has higher impedance which needs to be corrected otherwise nice lecture. Thank you.

can a generator create harmonic distortion?

Great video! Thanks Jeff

jeff Great presentation keep uo the good work

Can harmonic distortion be generated from poorly designed generators? (alternators) Say for instance, from a poorly designed wind generator that had harmonic content?

55 Deg. that's freaking cold.

Very helpful! thanks Jeff

Thanks a lot, very useful

I'm in the middle of making a switching PSU. What I've just heard is extremely helpful to my job. Thank you for sharing valuable knowledge. ^_^

very helpful, many thanks Jeff.

sinaserdal

Great video, but one thing I observed that most of the time the slide was not shown while you were pointing to the slides, making it missed out what you were trying to show. The camera was focused on you instead of the screen. Can you fix it please? or is it too late.

great video  jeff , make me more understand on harmonic 

Great video Jeff, thank you.

Great presentation!

Helpful insights, thanks Jeff.

Thank you!