Pete Perkins said:
"Historically, the HV impulse tests applied are safety tests." Safety-wise, HV tests of safeguard insulations are to determine that the safeguard insulations will withstand the normally-occurring transient voltages that occur on the mains circuits. I wouldn't call the HV tests as "safety tests." Rather, they determine the adequacy of the safeguard insulations. Impulse tests are relatively new, and require sophisticated test generators. The actual voltage that is applied to the insulations is a function of the source impedance and the load impedance. So, when an impulse test is applied in response to a safety requirement, we don't know if the insulations will withstand a mains transient voltage. IEC 60664-series allows use of impulse test or steady-state test as equal alternatives. 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 <[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]>
