Mark,
If such a table exists, it was probably generated by one of the power
companies. If you can not obtain the information, your best bet would be to
measure several examples of each type of properly prepared joint. Measuring
new, clean, carefully torqued joints should give you a reasonable idea of
what the millivolt drop should be for each size/type. You can then decide
how much percentage increase is acceptable for aging. Any joint over that
limit in the field will need to be serviced.
Scott Lacey
-----Original Message-----
From: [email protected] [SMTP:[email protected]]
Sent: Friday, May 05, 2000 8:32 AM
To: [email protected]
Subject: Millivolt drop tests
Dear All,
As part of our production safety tests, we check the millivolt
drop across a connection in a 300A dc supply to a cell stack.
In the past, we have only done that to one of the connections,
and our maximum allowed limit for the drop has been based
on results we've had in the past plus a bit of lee-way.
However, because of experience of our equipment in the field,
we feel we should test all the connections in the 300A line
rather than just the risky one. But I have no previous results
to go on for all the different types of connection. I was told
that there is a table somewhere of current/material/cross-
sectional-area/tightening-torque/temperature etc etc against
mV drop. Can anyone point me in the right direction, as I
have exhausted my Standards, text books and company
library!
All pointers very gratefully received.
Regards, Mark
--
Mark Hone
Wellman CJB Limited Email: [email protected]
Airport Service Road Tel: +44 (0)2392 629239 (Direct)
Portsmouth, Hampshire Tel: +44 (0)2392 664911
PO3 5PG, ENGLAND Fax: +44 (0)2392 697864
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