I.S. EN 61400-12:1999

INTRODUCTION
1 General
    1.1 Scope
    1.2 Normative references
    1.3 Definitions
    1.4 Symbols and units
    1.5 Abbreviations
2 Test conditions
    2.1 Wind turbine generator system
    2.2 Test site
3 Test equipment
    3.1 Electric power
    3.2 Wind speed
    3.3 Wind direction
    3.4 Air density
    3.5 Precipitation
    3.6 Wind turbine generator system status
    3.7 Data acquisition system
4 Measurement procedure
    4.1 Introduction
    4.2 Wind turbine generator system operation
    4.3 Data collection
    4.4 Data selection
    4.5 Data correction
    4.6 Database
5 Derived results
    5.1 Data normalization
    5.2 Determination of measured power curve
    5.3 Annual energy production (AEP)
    5.4 Power coefficient
6 Reporting format
Tables
1 Example of presentation of a measured power curve
2 Example of presentation of estimated annual energy
    production
Figures
1 Requirements as to distance of the meteorological mast
    and maximum allowed
2 Presentation of example data: power performance test
    scatter plots
3 Presentation of example measured power curve
Annexes
A Assessment of test site
B Calibration of test site
C Evaluation of uncertainty in measurement
D Theoretical basis for dertermining the uncertainty of
    measurement using the method of bins
E Bibliography
ZA Normative references to international publications with
    their corresponding European publications

Covers a procedure for measuring the power performance characteristics of a single wind turbine generator system (WTGS) and applies to the testing of WTGS of all types and sizes connected to the electrical network.