We are trying to figure out the applicability of 61000-3-3 Flicker Standard to the power supply in our product. We have a device that may be "hard wired" into the public low voltage (230 V) mains under certain circumstances, and has no mains switch. Given this, it appears that the maximum relative voltage change dmax shall not exceed 4% (61000-3-3, Section 5, Limits, condition a.) since it is "energized immediately on restoration of supply after a power supply interruption".
Question 1: Does the 4% dmax include the inrush upon restoration of supply, or does it apply only to voltage changes caused by changes in current demand during operation (after inrush)? To make things even messier, the device in question is a control for a power distribution recloser (over 1 kV). During a fault, it might demand enough current to exceed 4% dmax when operating the recloser. The public low voltage powering the control would almost certainly be derived from the high voltage system being switched by the recloser. Question 2: Do we need to meet the 61000-3-3 limits during recloser operation (most likely fault conditions)? Don Borowski Schweitzer Engineering Labs Pullman, WA 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: Ron Pickard: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
