Thanks John, It was my understanding that if there is no logical explanation for a set of standards rules, it's history, compromise, or commercial interests. ;<)))
I do not think that limitation of voltage distortion is the real reason for harmonic current control. It's the harmonic current that is bad for electrical distribution systems. The specified source for harmonic <16A measurements calls out for 0 Ohm source impedance. Gert Van: John M Woodgate [mailto:[email protected]] Verzonden: zondag 25 april 2010 13:13 Aan: ce-test, qualified testing bv - Gert Gremmen CC: Ken Javor; [email protected] Onderwerp: Re: [PSES] Harmonic Emissions Testing In message <[email protected]>, "ce-test, qualified testing bv - Gert Gremmen" <[email protected]> writes >The reasons to limit harmonic currents are not all emc-related, > >and mostly power distribution related: That is regarded as an EMC matter. The issue of absolute or proportional limits is complex. It's not just 'history' as such, although you might read IEC 61000-1-4 some time. Logic says that harmonic current limits for a given technology should be proportional to fundamental current, and indeed IEC 61000-3-12 is based on proportional limits, but that in turn demands requirements on source impedance (expressed as shot-circuit power) in order to control *voltage distortion*. -- 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]>
