Fwd: Re: Fwd: SOV/MOV protection devices [RE-wrenches]

[hugh piggott]

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Max Enfield installs Trace inverters in Australia and has found that 
lightning protection is a basic necessity.  I forwarded Kent's 
message to him for comment..

>Date: Sun, 20 May 2001 17:43:01 +1000
>From: Max Enfield <max at planetarypower.com.au>
>Since we started using MOV based surge diverters we have not had a
>single failure on any protected system.  Thus our experience does not
>support what Kent Sheldon is saying.
>
>Several years ago we installed a shunt and shunt controller near a
>micro-hydro generator, to clamp the line voltage. [This is something we
>no longer do].  A couple of individual MOVs were fitted, however about
>four or five years later a power diode failed, with lightning being the
>suspected cause.  This was when I did not have the understanding of the
>issues that I now have.  The MOVs would have had much less than the 40kA
>rating we presently use and the importance of good solid earthing wasn't
>appreciated.
>
>My point is that MOVs in themselves are not a magic bullet. Like all
>things, the components must be adequately rated and the job must be well
>done before confidence in the result can be justified. 
>
>The information on lightning protection that I previously supplied you
>has been revised slightly, packaged nicely and is now on line at
>www.planetarypower.com.au/ifo/lightning.  Perhaps you could inject this
>reference into the thread.
>
>Regards,
>
>Max

-- 
Hugh

Scoraig, in Scotland.
http://www.scoraigwind.co.uk

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