NBN EN 61400-12-1 : 2006

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and units
5 Preparation for performance test
   5.1 Wind turbine and electrical connection
   5.2 Test site
6 Test equipment
   6.1 Electric power
   6.2 Wind speed
   6.3 Wind direction
   6.4 Air density
   6.5 Rotational speed and pitch angle
   6.6 Blade condition
   6.7 Wind turbine control system
   6.8 Data acquisition system
7 Measurement procedure
   7.1 General
   7.2 Wind turbine operation
   7.3 Data collection
   7.4 Data rejection
   7.5 Data correction
   7.6 Database
8 Derived results
   8.1 Data normalization
   8.2 Determination of the measured power curve
   8.3 Annual energy production (AEP)
   8.4 Power coefficient
9 Reporting format
Annex A (normative) Assessment of obstacles at the test site
Annex B (normative) Assessment of terrain at the test site
Annex C (normative) Site calibration procedure
Annex D (normative) Evaluation of uncertainty in measurement
Annex E (informative) Theoretical basis for determining
        the uncertainty of using the method of bins
Annex F (normative) Cup anemometer calibration procedure
Annex G (normative) Mounting of instruments on the meteorological
        mast
Annex H (normative) Power performance testing of small wind turbines
Annex I (normative) Classification of anemometry
Annex J (informative) Assessment of cup anemometry
Annex K (informative) In situ comparison of anemometers
Annex ZA (normative) Normative references to international
         publications with their corresponding European publications
Bibliography

Describes a procedure for measuring the power performance characteristics of a single wind turbine and applies to the testing of wind turbines of all typesand sizes connected to the electrical power network.