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July 2007

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Subject:
From:
Louis Hart <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 19 Jul 2007 10:48:28 -0400
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The IEEE Spectrum magazine had an article with some pictures a few years 
ago about this work and high voltage lines in the American west. Aahne 
mentioned the helicopter's capacitance. It may be low, with respect to 
Earth, since it is up high. Still, it looked like a lot of charge was 
being transferred at the hook up. One thing interesting to me was the 
arcing when the copter came back to pick him up. Looks like a lot of the 
charge on the 'chopper' was dissipated while it apparently flew around to 
the point where it picked up the lineman, since some big sparks flew when 
it hooked up again. Maybe when it gets back to base, it's safe to just 
step off. But I would still want someone with a voltmeter to come out and 
check before I got off. 

Louis Hart
Technology Transfer Specialist
National Technology Transfer Center
316 Washington Av
Wheeling, WV 26003
304-243-2553

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