Harmonic Distortion Abbreviation
Harmonic Distortion Abbreviation
(OP)
I have an output from Dranview showing harmonic distortion in a three-phase system. the system consists of motors fed from single phase drives, protected by breakers, and the breakers have been 'randomly' tripping.
My term in questions is VTHDRss. There is a voltage vs time graph showing the Phase <A, B, C> Harmonic Timeplot, and the dots/lines that are plotted are labeled with that term. I'm fairly certain that the 'VTHD' part refers to Voltage Total Harmonic Distortion, but am unsure what the Rss stands for. Google only brought up a pdf in a foreign language( .no tag, Norway?) which is more or less an example of the output.
link to said pdf
ht tp://www.b io.uib.no/ internesid er/Ombygg/ Forprosjek t%20HIB%20 3%20og%204 %20etg.pdf
Page 46, top graph on the page.
The only difference in the graphs seems to be a set up feature in the program, since my graph has only dots(compared to the example which has lines). Further, where the two voltage sags occurred in the time frame, there are vertical lines on that graph. I don't really know how to interpret the graph(since I don't know what VTHDRss is), but I'm hoping this term will clear it up a bit.
Thank you.
My term in questions is VTHDRss. There is a voltage vs time graph showing the Phase <A, B, C> Harmonic Timeplot, and the dots/lines that are plotted are labeled with that term. I'm fairly certain that the 'VTHD' part refers to Voltage Total Harmonic Distortion, but am unsure what the Rss stands for. Google only brought up a pdf in a foreign language( .no tag, Norway?) which is more or less an example of the output.
link to said pdf
ht
Page 46, top graph on the page.
The only difference in the graphs seems to be a set up feature in the program, since my graph has only dots(compared to the example which has lines). Further, where the two voltage sags occurred in the time frame, there are vertical lines on that graph. I don't really know how to interpret the graph(since I don't know what VTHDRss is), but I'm hoping this term will clear it up a bit.
Thank you.






RE: Harmonic Distortion Abbreviation
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Harmonic Distortion Abbreviation
RE: Harmonic Distortion Abbreviation
What else would you suggest?
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Harmonic Distortion Abbreviation
Regarding your comment about the single phase(input) VSD tripping your breakers. This will likely be the 3rd harmonic and is often solved by introducing a line reactor to the drive.
RE: Harmonic Distortion Abbreviation
THDF = the same, but as % of fundamental.
But ss? My guess = steady state