Dear Sato, Thank you. Yes, the standard suggests a method for currents over 200A. However, we are speaking of a current of about 70A, in which the lab does not have a CDN.
André Gomes Videira Laboratório de Ensaios e Certificações Telefone: + 55 47 3276-7613 | Skype: agvideira WEG Drives & Controls - Automação Ltda. www.weg.net -----Mensagem original----- De: T.Sato [mailto:vef00...@nifty.com] Enviada em: quarta-feira, 5 de dezembro de 2018 08:27 Para: Andre Gomes Videira <ago...@weg.net> Cc: EMC-PSTC@LISTSERV.IEEE.ORG Assunto: [Possible SPAM] Re: [PSES] Alternative coupling for Surge Test - Higher current products Prioridade: Baixa On Wed, 5 Dec 2018 10:10:22 +0000, Andre Gomes Videira <ago...@weg.net> wrote: > We have some products with a current higher than the Surge test CDN from many > labs in our region can withstand. > So, we found a lab that does an alternate Surge test. > > Instead of connecting the product to the CDN, they connect it directly to the > power supply. > In the output of the CDN, in each phase, a 10uF capacitor is placed, and it > goes directly to the product power supply. > This way, the current does not go through the CDN, and the Surge noise > couples directly to the product. > > We have some doubts on this method, since: > > 1) It changes the output CDN surge impedance, what can lead to some > changes in the noise waveform > > 2) Since I am coupling directly to the supply, the noise voltage could > be divided by going to the product and to the supply in parallel > > What are your thoughts on this? Is this a valid test method? FYI, IEC 61000-4-5:2014 Annex H (informative), "Coupling/decoupling surges to lines rated above 200 A", suggests an alternative method which use a long supply cable as the decoupling network. Regards, Tom -- Tomonori Sato <vef00...@nifty.com> URL: http://t-sato.in.coocan.jp Clique <a href="http://disclaimer.weg.net/"; target=_blank>aqui </a> caso você não seja o destinatário deste email, ou desejar conhecer nossa política de privacidade. Click <a href="http://disclaimer.weg.net/"; target=_blank>here </a> if you are not the intended recipient, or in case you want to know our privacy policy. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <sdoug...@ieee.org> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
