Aside from all the regulatory issues of leakage current and nasty failure modes
of MOVs. What methods have been used to detect a failed transient suppression
device in equipment? Or, is there some expectation the devices will survive a
warranty period and that alone is good enough?
Seems
The 2012 Symposium SPECIAL EDITION of the newsletter is available at
http://ewh.ieee.org/soc/pses/newsletters.html#Current. You will find a
preliminary schedule, tracks, and summary of presentations and papers being
presented at the conference. Details about the event are also provided. See
On 9/23/2012, Doug Powell wrote:
Aside from all the regulatory
issues of leakage current and nasty failure modes of MOVs. What
methods have been used to detect a failed transient suppression device in
equipment? Or, is there some expectation the devices will survive a
warranty period and that
Doug I think your assumptions are correct. It's pretty much physical
inspection.
Specifically MOVs may split open and smoke may escape. Gas protectors usually
fall open. Zeners (most semiconductors and carbon protectors) fail short and
their no guarantee they won't burn a trace so UL sometimes
Fred,
While MOVs tend to be messy and TSBs can short both of these devices can fail
in an open state as well. Or, the device shorts and a protection fuse may
open. At which time the transient device is open, protection it afforded is
gone and the equipment continues to operate. This is the
Not MOV specific, but I've had to define and prescribe such tests. (It
would be nice if hard copy had hyperlinks.)
BIT for these voltages could be problematical ($ and board space,
clearance and creepage etc. ) , but a low current breakdown voltage test
during scheduled maintenance can
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