Met towers for meteorological instruments
Over the past fifteen years, we have specialised in the construction of met towers (measurement towers carrying meteorological instruments) so that we are now one of the leading suppliers in all of Europe. We work for many of the major wind-turbine manufacturers, installation companies, wind-measurement companies and energy vendors.
Close collaboration with major manufacturers and wind-measurement specialists has given us specialist knowledge and know-how. This is why we can provide our customers with professional advice and service so they get an ideal solution that meets their needs for good, reliable wind measurements. True measurements are crucial for selecting the right wind turbine for the conditions. There are many instances of where imprecise measurements have had negative consequences for the success and profitability of a wind farm.
To ensure ideal wind measurements for our customers, we have tested our meteorological tower to determine how far a measurement needs to be taken from the tower to get wind measurements that meet the IEC 61400 norm of a maximum wind-flow distortion of 1%. Therefore, we know exactly how long the booms must be to meet this norm and thus provide our customers with true, reliable measurements.
Temporary or permanent towers
There are a wide variety of met-tower types availabe..
Permanent met-towers are often self supporting models as they are very strong and can withstand wind and weather. They can be installed for up to 30 years and require very little maintenance.
Temporary met-towers are used in a variety of ways. In some instances, they are installed for a period of three months to three years until the wind turbines are installed, which makes it possible to carry out qualified wind-condition measurements at various elevations. In other instances, they are used to calibrate the wind measurements to make them as accurate as possible. In other words, a temporary tower is installed at the very spot where the wind turbine will be installed and then a permanent tower is installed close by. This provides wind measurements from two sites which increases their reliability. When the temporary tower is dismantled later on, and the wind turbine is installed at the same location, one knows the exactly effect of the wind on the wind turbine based on the continued measurements from the permanent tower. Large wind farms usually have several measuring positions to enable both "up-wind" and "down-wind" measurements. In addition, it is a good idea to have several towers located at various places in the farm to be able to compare wind data from several positions and thus optimise turbine output.