Frequently Asked Questions

Q:  Does the wind blow equally year round?

A:  June, July and August are typically the least windy months of the year, while winter and early spring are the windiest.

Q:  What happens on a day when there is no wind?

A:  The turbine will wait for wind and if the wind blows at more than 7 miles per hour, the turbine blades will start turning and producing energy.

Q:  How does the turbine know the wind speed and direction?

A:  On top of the nacelle of the turbine, there is a weather station that tracks wind speed, temperature, direction and other variables that are reported back to the turbine's control center.

Q:  Is there such a thing as a day with too much wind?

A:  Yes, for safety reasons, the wind turbine blades will fully pitch out of the wind when the wind speed exceeds 60 miles per hour.

Q:  What type of wind speeds are required to turn the blades?

A:  The turbine generally starts producing energy when the wind is blowing more than 7 miles per hour, the equivalent of 3 meters per second.

Q:  When does the turbine reach the 900kW capacity?

A:  Full capacity is reached at 26 miles per hour (12 meters per second)

Q:  Can the turbine be turned on/off altogether?

A:  Yes.  Generally the turbine operates automatically 24 hours a day.  It can be turned off manually onsite or by remote access control.

Q:  As the wind is powering the blades, what is happening inside the turbine?

A:  The blades are connected to the hub.  The hub is connected to the main shaft and the main shaft is connected to the gearbox and generator.  When the blades are turning, the mechanical rotation of the shaft is then converted to electrical energy with a rated voltage of 690 volts and a rated frequency of 60Hz.

Q:  How large are each of the tower sections?

A:  The PowerWind turbine tower consists of three sections for a total hub height of 220 fee, with the bottom section at 56 feet, middle section at 75 feet, and the top section measuring 89 feet.  The height from the base to the tip of the blade when in a vertical position is 322 feet.

Q:  How large are each of the three blades?

A:  Each blade is 88.91 feet long

Q:  What is the circumference of the hub?

A:  At the connection to the nacelle(the housing which holds the gear box and blades) the hub measures 11.22 feet

Q:  Once the main components are assembled, what type of work will still need to be done? (as far as running electric wiring, getting it hooked up, etc)

A:  There is still much work to complete inside the tower such as running electric wiring to all components that are "up-tower" all the way "down-tower" to the transfer and communication systems,  Once the turbine is mechanically assembled, the next step is commissioning.  This includes the testing of all safety features and electrical devices to prepare the turbine for standard and automatic operation.

Q:  Can weather delay the installation of our turbine?

A:  Yes, specifically strong winds in excess of 18-mph may cause a wind delay day.  These types of conditions are too dangerous to lift the large components.  Normal construction will commence once the wind speeds subside.

Q:  How many workers, approximately, are on site working on this project?

A:  The number varies based on the specific project tasks.  During assembly, there are about 22 workers on site.

Q:  What size crane is used to assemble the turbine?

A:  A 650-ton hydraulic crane is used.  The crane can reach heights of 320 feet.  This is the approximate size of the turbine once fully assembled.


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Uploaded on September 16, 2013, 2:02 pm
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