In message <16641305538561692815456@IMAC8632>, Jon Francis <[email protected]> writes >My understanding (happy to be corrected) of the reasons for harmonic >current control are: > >1/ Limiting voltage distortion > >2/ Limiting apparent power requirements. >Since transmission and generating capacity is rated in VA (kVA >transformers, Isquared R losses in lines) rather than watts, then >harmonic current that contributes to VA but not to Watts requires >increased utility capacity for no extra true power delivered.
I have several times suggested 2/ as a reason; the I^2R losses represent an economic loss to the industry, but the supply industry experts say it is not a significant issue. It is significant at the product level if the poor power factor results in a current exceeding common wall-socket ratings. -- This is my travelling signature, adding no superfluous mass. John M Woodgate - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
