1. I was not the one asking the question, I provided a reply to the original post. 2. Your attached article has problems with basic physics, and was designed to sell the vendor's test equipment. 3. The purpose the PSES listserv/forum is to SHARE information amongst our colleagues, unless off-topic or of non-PC content. 4. I was hoping someone older, wiser, and respected would call the di-electric test non-relevent as a metric for insulation aging and suggest the Insulation Resistance test, which can be done at a very low voltage. 5. Klingons do not use insulation. 6. There is a Python class for the 'luck' calculation; it is not good or bad, it is.
Brian -----Original Message----- From: --- removed --- Sent: Tuesday, July 12, 2011 1:10 PM To: '[email protected]' Subject: RE: [PSES] High voltage testing by any name Brian, Perhaps the attachment will help. The full name is Dielectric Voltage Withstand Test, and 'Withstand' is the same as 'Hi Pot'. I am not clear about the Arc detect, not the same as Arc Flash which maybe something else. What you are testing is not the wiring but the insulation around the wiring. My feeling is if it is strictly wiring and not capacitors or other semiconductors are involved time may not be factor, however UL for ITE product requires higher levels for 1 sec testing and lower for 1 min. Not sure there is any value for going longer. Some testers recommend doing an 'insulation resistance test' before and after the hi-pot to give some validation that the insulation was not compromised. The test can be viewed as blowing up a balloon and looking for leaks, and yes if you blow it up too much (rated value) you can compromise the integrity of the insulation. I would look up the various tester company websites and read their User Manuals or other technical literature. See QuadTech, Slaughter, Acoustic Research AR. Also search for terms like CE Magazine safety testing dielectric voltage withstand test. Good Luck! -----Original Message----- From: Brian Oconnell [mailto:[email protected]] Sent: Monday, July 11, 2011 9:43 AM To: [email protected] Subject: Re: [PSES] High voltage testing by any name 1. Paschen's Law 2. IEEE PSES symposium presentations 3. Klaus Stimper, VDE, "The Physical Fundamentals of Low-Voltage Insulation Coordination" 4. xkcd.com/643 5. google.com/support/websearch/ 6. python.org I am not certain of the meaning "pulse testing"; perhaps you are referring to 'surge' testing, which is can be considered a different species. Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Mark Hone Sent: Monday, July 11, 2011 3:21 AM To: [email protected] Subject: High voltage testing by any name Colleagues - I have been specifying routine Voltage Withstand tests to UK Naval Standards for years and I have recently been called upon to explain them in detail and to say if their use will prove that wiring is too old/stressed to be safe to use: I have realised my knowledge isn't as comprehensive as it should be. We have also had a recent thread here on the (in)advisability of repeat high voltage testing which has piqued my interest even more in the subject. Whilst Google-is-my-friend, Google hasn't thrown up for me* a reference to a good, impartial, thorough overview of this particular test - for instance answering the questions: - Test duration: a few seconds, a few tens of seconds, two minutes (different in different standards) - pros and cons other than the obvious? - Under what circumstances is pulse testing advised and when continuous stress testing? - When is it a test of dielectric and when a test of creepage and clearances? - Is there a real difference between Voltage Withstand/Flash/Dielectric Strength/HiPot tests? Or any implied one? So, may I ask if anyone can point me to good, impartial reading sources for my intellectual (!) improvement? With thanks in advance, Best regards, Mark - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html 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]>
