On Mon, 02 Jun 2003 16:51:47 -0400, "Stephen Irving" <[email protected]> wrote: >We are investigating the Electrical Fast Transient (EFT) test as detailed in IEC/EN 61000-4-4. I am looking for some experience/advise with this test. > >My understanding is that the IEC created this test to standardize fast line transient tests, such that a single repeatable test could be performed. As such, I am having a hard time finding information regarding the naturally occurring voltages and frequencies of these events. We are trying to expand the prescribed test into a "real-world, worst case" test. Does anyone have any experience or related documents that may help? > >Also, the test is prescribed to have a period of 300ms (15 line cycles at 50Hz). We are in the US, and are running the test at 60Hz (which does not work out to an even number of cycles - the beginning of the transient moves in time). Does anyone know if the test should be altered to provide a repeatable transient, or if there is a reason to leave it at 60Hz. > >I look forward to your comment - this is an interesting one! As always, thanks for your help. > >Best regards, >Steve Irving
It looks like the EFT test was copied from an older IEEE document circa 1980. Take a look at specification IEEE C62.41, "Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits". Besides defining the waveshape of various transient waveforms (100kHz ringwave, Combination wave, 5n/50ns EFT, 10/1000us wave, 5kHz ringawave), it also has a section describing transients found in the United States. Pat Lawler <[email protected]> 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] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
