<[email protected]>, [email protected] inimitably wrote: >When troubleshooting surge problems on products we often see the surge pulse >to >be much higher after the line filter (testing the AC Mains with Line-Earth >surge >pulses according to EN61000-4-5). > >Can someone explain the science behind this and what effect the load might >have? >Can this increase in the surge potential be anticipated ahead of time so proper >clearances can be designed in?
The filter is terminated, at frequencies contained in the surge, in a higher impedance than its characteristic impedance. This mistermination results in a peaked frequency response, and the peak may well correspond to a voltage gain of 10 times or so, if you are unlucky. In theory, it is possible to calculate the frequency response, IF you know enough about the filter and the load presented to it. SPICE simulation should be quite practicable, either using the pulse waveform as input or using a swept sine wave. -- Regards, John Woodgate, OOO - Own Opinions Only. Phone +44 (0)1268 747839 Fax +44 (0)1268 777124. http://www.jmwa.demon.co.uk Why not call a vertically- applied manulo-pedally-operated quasi-planar chernozem-penetrating and excavating implement a SPADE? ------------------------------------------- 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,"
