So the real problem lies with the power companies for the power outage in the first place...............(just joking).
================================================================= John Woodgate <[email protected]> on 03/14/2001 12:03:56 PM Please respond to John Woodgate <[email protected]> To: "Wagner, John P (John)" <[email protected]> cc: EMC-PSTC <[email protected]> "Colgan, Chris" <[email protected]> (bcc: Robert E. Heller/US-Corporate/3M/US) Subject: Re: Flicker problem <4203d61676d0ae468aa5cea90a891c13235...@cof110avexu4.global.avaya.com>, Wagner, John P (John) <[email protected]> wrote: > I think this refers to Amendment 1of IEC 61000-3-3 published January 2001. > Apparently it has not yet been transposed into an EN. It was dual-voted, so it will be. >? The amendment (at > least as it effects me) deals primarily with requirements and limits for > inrush current. > Well, inrush current is dealt with in the unamended standard, but neither that or the amendment deal with it directly. Limits are expressed as 'dmax', the maximum relative voltage change, measured as an r.m.s. value over the worst half-cycle, starting from the zero-crossing. The amendment goes into much more detail about this, and gives relaxed limits for some types of equipment. The main problem with inrush current is where there is a lot of equipment in one location, and there is a power outage. When the power comes back on, cumulative inrush current may reach many tens of times normal load current, causing protective devices to operate and restore the 'outage'! In some cases, protective equipment has been damaged. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Foxhunters suffer from tallyhosis. PLEASE do not mail copies of newsgroup posts to me. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall," ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
