Circuit simulation (Pspice or similar) would allow you to find highest working voltage on each capacitor under normal and under single-fault conditions including component tolerances and line voltage variation. In this country, a nominal 347/600V service has voltage variation limits of 550V to 625V measured phase-to-phase. X2 type capacitors rated 400Vac should be suitable in your applications, but you need to do the analysis and maybe do a few tests.
Ralph From: Boštjan Glavič <mailto:bostjan.gla...@siq.si> Sent: Wednesday, September 27, 2023 8:01 AM To: mailto:EMC-PSTC@LISTSERV.IEEE.ORG Subject: [PSES] EMI filtering for 600V AC mains system Dear safety experts I hope there is someone who can help me on below topic. Customer is designing 600V rectifier for datacentres. Mains voltage in datacentre will be 600Vac, delta system (no neutral), OVCII with 4000V transients. Product will be certified according IEC 62368-1. They are designing input EMI filter with X caps. They plan to use so call Y filter (with artificial neutral point not being connected). Question is what kind of X caps they need to use and what kind of rating. Question is raised since clause 5.5.2 is not so clear in below paragraph (do we need to apply in this case or not) Under single fault conditions, if a capacitor or RC unit consists of more than one capacitor, the voltage on each of the remaining individual capacitors shall not exceed the voltage rating of the relevant individual capacitors. If customer is using X1 capacitor rated min. 350V on the positions CX1-CX3 is such configuration acceptable or not? If not, why not. Thank you for your support. Best regards, Bostjan SIQ Ljubljana ________________________________________ 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 All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/%20 Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: mailto:msherma...@comcast.net Rick Linford at: mailto:linf...@ieee.org For policy questions, send mail to: Jim Bacher at: mailto:j.bac...@ieee.org ________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- 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: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
