slip rings [RE-wrenches]

[hugh piggott]

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At 11:12 am -0600 12/7/01, Windy Dankoff, Dankoff Solar wrote:
>
>We were surprised and disappointed to find that the cable twisting 
>was frequent. It seems that the shift of winds, perhaps some 
>nearly-daily shift, seemed to always cause rotation in the same 
>direction, or whatever might explain it.

It is wise to allow enough length and flexibility in the cable hang 
for 100 twists to accumulate without stress.  This is easy to do.  I 
know of a site where there will be approximately 300 twists per year, 
and in that circumstance we have a problem.  However I do believe 
that the vast majority of sites will have no problem over a five year 
period, and to be honest I don't think about it that much.  But 
mention it to someone from the USA and they spend the next week 
devising ever more elaborate solutions to a problem with (for the 
most part) does not exist.

It sounds as if sliprings should be fitted as standard in the USA if 
only to end the discussion :-)  But I personally would not buy them 
if I could save 10% on wind turbine price.  Or if they did not look 
beefy enough for me.  Corrosion, overheating, slack yaw bearings 
causing damage, contamination with oil/grease, there is plenty to go 
wrong along that road.

>
>It would be good now to ask the manufacturers if they have had 
>complaints from particular locations, using cable system. I'm not 
>directly involved in this right now, but I pass this on to be of 
>help.

thanks :-)
-- 
Hugh

http://www.ScoraigWind.co.uk

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