PSNet
We don't seem to get published data based upon testing to the standards
with which we normally work. Dr Pfeiffer (whom we know from the 28A/664
work) and his colleagues have performed an evaluation of the failures of
equipment to impulses as defined in 61000-4-5, which are in agreement with
the principles of insulation coordination.
Failures of electronic equipment caused by transient overvoltages are
increasing rapidly is a part of the header for this paper. The particulars
are contained in the article, but the thrust of the evaluation is that the
equipment failed what is considered to be a reasonable test. 13 of 20 power
supplies failed the test. Although this is described as an EMC test, it
certainly has safety implications. The abrogation of protective insulation
can lead to fire or electric shock from the failure. The article suggests
the addition of a series impedance as a step in protection until the
insulation in the capacitors is improved.
The article is from the IEEE Electrical Insulation Magazine, March/April
2000 - Vol 16, No 2. Get your librarian to chase it down for you...
It would be nice to get more published data on this... anyone putting
together a paper???
br, Pete
Peter E Perkins, PE
Principal Product Safety Consultant
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
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