Hi group, When 2 isolation components are put in series, my experience is that the total isolation breakdown voltage measured with an impulse voltage (ex. 1.2/50us) is always smaller than the sum of both. An example could be the isolation between 2 transformers, for example between the AC mains (transformer AC-SELV) and an Ethernet transformer (SELV-ETH). Another example could be between 2 open relay contact, with each contact 2.5kV but the sum "only" 3.5kV. Does anyone know of literature that explains this phenomenon? I'm also interested to understand the process of the breakdown of 2 isolations in series, like how can 1 insulation break down when the other did not yet.
Thanks & best regards Kris Carpentier, - ---------------------------------------------------------------- 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 <[email protected]> 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 <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
