I will get a copy and read what it has to say; however, the real issue today is not transient overvoltages, but transient currents! With the proliferation of overvoltage protectors in virtually every area -- transmission, distribution, residential, industrial -- the incidence of overvoltages should be pretty low.....
That doesn't mean nothing is happening -- it simply means the transient voltage suppressors are doing their job. What we really need is a study of transient CURRENTS to see what's really out there, but to my knowledge, no study has every been done. If anyone is aware of such a study, I'd love to see it. Mike Hopkins [email protected] > -----Original Message----- > From: Peter E. Perkins [SMTP:[email protected]] > Sent: Monday, August 10, 1998 2:01 AM > To: PSNetwork > Subject: Transient overvoltage field study paper > > > PSNet > > info on a paper of interest to this group... > > 'Transient Overvoltages in Low-Voltage Systems - A Field Study > in > Germany' > by K Stimper - AENEA GmbH, G Ackerman - Deutsche > Telekom > AB, J Ehrler - Dehn & Sohne GmbH, R Maier - Siemens AG and K Scheibe - > Polytechnical College Kiel... > published in July/August 1998 - Vol 14, No 4, IEEE > Electrical Insulation Magazine. > > Key words: Transient, surge propagation, line voltage, > occurrence > rate > > This reader's abstract: The article digests to results of > transient voltage measurements at about 40 locations over 700 > measuring-months recording about 5000 incidents. The frequency of > overvoltages found in this study were considerable lower than had been > reported in some earlier studies. Conditions included the usual > commercial/residential as well as industrial environments. They also > measured transients on telecom lines and found them to be similar to > earlier results. The results are for the conditions found in Germany > - > including their extensive use of underground facilities and very > moderate > occurrence of thunderstorms and lightning (on a worldwide basis). The > results have been reported to IEC SC28A (IEC664 - Insulation > Coordination > in Low Voltage Equipment - including Creepages and Clearances in > Equipment) > for consideration in developing their requirements. > > This article, unfortunately, does not bring together data on a > worldwide basis - from systems which do not make extensive use of > underground systems nor areas of the world where there are > considerable > more thunderstorms and lightning activity. How could this work be > extended > to a worldwide basis? > > This article presents some basic information and is of > interest to > the PS community; I recommend it's reading to this list. (please > don't ask > me for copies, I'm not a library nor copy shop) > > - - - - - > > Peter E Perkins > Principal Product Safety Consultant > Tigard, ORe 97281-3427 > > +1/503/452-1201 phone/fax > > [email protected] email > > visit our website: > > http://ourworld.compuserve.com/homepages/peperkins > > - - - - - > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], or [email protected] (the list > administrators). --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], or [email protected] (the list administrators).
