In message
<OFE46BE9DC.DA54D6BA-ON88257AD6.00657B8E-88257AD6.0067472A@US.Schneider-E
lectric.com>, dated Sun, 16 Dec 2012,
[email protected] writes:
It's really a power thing too. (energy by time) If you hit the MOVs
too often with a 6kV pulse, they'll overheat and fail. If say you hit
them every 90s instead of every 30s, they'll likely survive a hundred
hits.
I should think that repetitive 6 kV pulses are rare anyway. But the
point is that MOVs have to be regarded as parts that can get very hot,
so must be sited so that they can do that (however rarely it occurs)
without causing fire.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
The longer it takes to make a point, the more obtuse it proves to be.
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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