The reason that on any given site, some are running, and some are not- the computer controlling and monitoring their operation lets the tower make 4 revolutions in following the wind. Then it needs to shut down, and reverse the tower, to unwind the cables that bring electricity from the turbine, to the ground. When the cables are unwound, the computer will let the turbine spin again. Found that info in a motel brochure in SW MN a few years ago, home of Glacial Ridge- literally 100s of turbines along MN 23. I actually stopped the car adjacent to a number of towers to hear how noisy they were. Was surprised at the low noise level.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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