In message <9e9e8fb6d4a92f45929923caa5216d37029fb...@bct1e2k301.americas.tsp.ad>, dated Wed, 4 Jun 2008, "Goedderz, Jim" <[email protected]> writes:
>We have some indirect evidence, and some damaged product, that appears >to be related to over voltage on the power grid in Australia. > >The nominal is 240V 50Hz, but we are hearing accounts of voltages as >high as 285V. > >Has anyone else had to deal with damaged product, or can confirm that >sections of ?down under? may occasionally be running well beyond normal >tolerance? Remote (and maybe not so remote, due to development) areas of Oz are fed with a single live conductor, relying on the ground for return. While the people concerned are adept at managing this type of distribution, it is inevitably subject to large transients due to indirect lightning strike. High voltages of a longer duration may occur on private systems of course. I don't know whether there is any 'electrical vandalism', such as I've heard of in UK where a serious network fault has caused the network operator to bring in diesel generators. The local 'yoof' spray 'starting gas' aerosol into the air intake, which makes the engine race briefly, until the governor responds. Maybe they don't need starting gas in Oz. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
