Hi Peter:
Don't use the VDR or any transient suppression. Take it out. Your insulation is good enough and is not likely to be damaged by a transient over-voltage. VDRs and most other transient suppression schemes may protect the immediate equipment, but generate transients for other equipment because they short-circuit the power line; the energy in the inductance and capacitance of the power line must be dissipated somewhere. See papers by Francois Marztloff. And my paper, "HBSE and Insulation Coordination," at the Chicago PSES Symposium, May, 2015. Instead, rely on the transient suppression that is provided by the utility. If you must suppress transient over-voltages, do it in the secondary circuits where the energy is much lower, and the effects of the suppression do not propagate in the power line. Best regards, Rich - ---------------------------------------------------------------- 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>
