On 6/4/2008, Jim Goedderz wrote:
We have some indirect evidence, and some damaged product, that appears
to be
related to over voltage on the power grid in Australia.
The nominal is 240V 50Hz, but we are hearing accounts of voltages as
high as
285V.
Has anyone else had to deal with damaged product, or can confirm that
sections of down under may occasionally be running well beyond normal
tolerance?
Hi Jim:
I know from my work with telecom equipment that the lightning environment in
Australia is quite severe. From your description, it sounds like the failure
mode appears to be from long term overheating, not a short surge, so lightning
would not be the first suspect.
However, one possibility that should be evaluated is whether the equipment
could have sustained damage from a lightning surge that caused an intermediate
failure mode of excess heating. Eventually this excess heating could lead to
a final failure mode that *appears* to be from excessive AC mains voltages,
even though the AC mains voltage was actually within normal tolerances.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com <http://www.randolph-telecom.com/>
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