Harmonics: What are they, why do I care, how do I solve?
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- Опубликовано: 18 май 2024
- Harmonics, What are they? Why do I care and how can I solve? Low Voltage drive Senior Application Engineer Jeff Fell discusses what cause harmonics and what kinds of problems can they cause? Learn about this important issue and how to solve the problems. This 36 minute education video will walk you through definitions to solutions.
Click here to download the presentation Harmonics: What are they, why do I care, how do I solve? at goo.gl/0gSRLz 
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How can I download the slides? Is there any book or article I can read and learn more?
Hey Vahid, thanks for commenting. You can get a copy of the slide deck here - goo.gl/0gSRLz
@@ABBdrivesUS thank you so much i need this for my report
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.
Great video Jeff, thank you.
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.
very helpful, many thanks Jeff.
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.
Thank you very much for uploaded this..
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. ^_^
Great video! Thanks Jeff
Very helpful! thanks Jeff
Thank you!
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!
Very good and simple for understanding thank you
Thank you very much this very important lecture about harmonic i really like this lecture
Great video. Neat and articulate.
Great presentation!
Helpful insights, thanks Jeff.
Thanks for sharing - hope the video was helpful!
Very nice presentation. Thanks
Thanks a lot, very useful
Great Video, Thank You
great video jeff , make me more understand on harmonic
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
Hi Jeff, I like youe lecture
Do you recommend to avoid VFD operated large chillers in data center application?
Good Video!
Correction @ 1:25 To be specific/accurate, actually harmonics *are* sinusoidal voltages and currents. Their *sum* is what results in a non-sinusoidal voltage or current.
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.
Thnks!!
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
Can harmonic distortion be generated from poorly designed generators? (alternators) Say for instance, from a poorly designed wind generator that had harmonic content?
yes . you can filter circuit on generator output
@@soamdathroopnarine3481can you explain that more to me please I have a 13000 predator generator. I’m trying to lower THD levels from 23 to 5 percent.
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.
And how do subharmonics work?
55 Deg. that's freaking cold.
I was thinking 70 + 20 = 90, Today I learn 70 + 20 = 72, and it responded to all my THD Math I knew before :)
actually you should 1. square both of them 2. add them 3. square root the result and you will ger 72.8 so called rms (root mean square ) try it :)
I just looked at this video & I had the same concern. I think he meant to use only "2 amps" instead of 20, & thus 2/70 = 2.857%, otherwise 28.57% is way higher than their worst case THD. But considering he represents ABB, they should have fixed all of these discrepancies by now.
You can see the formula for RMS at 4:35 I(total) = sqrt (Ifund^2 + Iharm^2) = sqrt (70^2 + 20^2) = 72.8A.
ABB means please
good nice
Nice presentation but we are more interested on what he is explaining. Now you guys are showing more of him instead of the slides
Hey Othusitse, thanks for letting us know. You can follow along with the slide deck here - goo.gl/0gSRLz
I enjoy Chris Pratt talking about harmonics.
Recent disasters due to harmonies
8:15 is that so? :thinking:
I think this is the opposite. A higher power transformer presents lower impedance.
BOOK: POWER SYSTEM HARMONICS AND PASSIVE FILTER DESIGNS J.C. DAS
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can a generator create harmonic distortion?
It depends on the design of the generator, but generally generators do not produce any significant harmonics. You could read up a better explanation from "Electric Machines" by Ashfaq Husain.
sinaserdal
Power factor and voltage drop. If these are acceptable I don't give a damn for harmonics
Well bad harmonics will give you bad power factor
@@michaelbee8263 Not necessarily. For instance, if you have square voltage and square current waveform, the power factor can be 1, but spectral analysis will show plenty of harmonics
@@imeprezime1285 a square wave? This video is a power application.