A little note to international and non Postwick residents. The village parish and green group have been working hard. Through part government funding we have managed to secure funds for the installation of a wind turbine. We think it is quite an achievement for a village hall such as ours to have this technology. Only time will tell the efficiency of the unit and the long term benefits but for now we can rest in knowing that the unit has been installed and commissioned. This page will contain more specific information when I collate it.
Adrian – Postwick Resident
The turbine was switched on at approximately 14.30 on Saturday 22/1 as of today January 29th 2011 it has generated 60Kwh of import energy.
The Wind Turbine is a 5kW Evance 9000 generator on a 15 metre mast and is connected through a rectifier to 2 x SMA 2500 WindyBoy inverters
Windyboy 2500 Inverter – The hall has 2
The above panel performs a number of functions including:
1. It contains a rectifier which converts the three phase “wild” AC from the turbine into DC
suitable for use by the inverters.
2. It holds the inverter(s) which convert from DC to grid synchronised AC.
3. It has safety fuses and isolator switches, for the input from the turbine, and output to the grid.
4. It holds various meters for measuring the energy generated by the system and the voltage
A small video about wind power
Further technical information from Wiki.
Wind Turbine – Postwick has the modern HAWT type.
A wind turbine is a device that converts kinetic energy from the wind into mechanical energy. If the mechanical energy is used to produce electricity, the device may be called a wind generator or wind charger. If the mechanical energy is used to drive machinery, such as for grinding grain or pumping water, the device is called a windmill or wind pump.
Horizontal-axis wind turbines (HAWT) have the main rotor shaft and electrical generator at the top of a tower, and must be pointed into the wind. Small turbines are pointed by a simple wind vane, while large turbines generally use a wind sensor coupled with a servo motor. Most have a gearbox, which turns the slow rotation of the blades into a quicker rotation that is more suitable to drive an electrical generator.
Since a tower produces turbulence behind it, the turbine is usually positioned upwind of its supporting tower. Turbine blades are made stiff to prevent the blades from being pushed into the tower by high winds. Additionally, the blades are placed a considerable distance in front of the tower and are sometimes tilted forward into the wind a small amount.
Downwind machines have been built, despite the problem of turbulence (mast wake), because they don’t need an additional mechanism for keeping them in line with the wind, and because in high winds the blades can be allowed to bend which reduces their swept area and thus their wind resistance. Since cyclical (that is repetitive) turbulence may lead to fatigue failures, most HAWTs are of upwind design.