{"id":418414,"date":"2024-10-20T06:20:54","date_gmt":"2024-10-20T06:20:54","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-61400-50-12022\/"},"modified":"2024-10-26T11:50:53","modified_gmt":"2024-10-26T11:50:53","slug":"bs-en-iec-61400-50-12022","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-61400-50-12022\/","title":{"rendered":"BS EN IEC 61400-50-1:2022"},"content":{"rendered":"

IEC 61400-50-1:2022 specifies methods and requirements for the application of instruments to measure wind speed (and related parameters, e.g. wind direction, turbulence intensity). Such measurements are required as an input to some of the evaluation and testing procedures for wind energy and wind turbine technology (e.g. resource evaluation and turbine performance testing) described by other standards in the IEC 61400 series. This document is applicable specifically to the use of wind measurement instruments mounted on meteorological masts, turbine nacelles or turbine spinners which measure the wind at the location at which the instruments are mounted. This document excludes remote sensing devices which measure the wind at some location distant from the location at which the instrument is mounted (e.g. vertical profile or forward facing lidars).<\/span><\/p>\n

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PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
2<\/td>\nundefined <\/td>\n<\/tr>\n
6<\/td>\nEuropean foreword
Endorsement notice <\/td>\n<\/tr>\n
7<\/td>\nAnnex ZA (normative) Normative references to international publications with their corresponding European publications <\/td>\n<\/tr>\n
9<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
13<\/td>\nFOREWORD <\/td>\n<\/tr>\n
15<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
16<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
17<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
18<\/td>\n4 Symbols, units and abbreviated terms <\/td>\n<\/tr>\n
23<\/td>\n5 General
6 Classification of cup and sonic anemometry
6.1 General <\/td>\n<\/tr>\n
24<\/td>\n6.2 Classification classes
6.3 Influence parameter ranges
6.4 Classification of cup and sonic anemometers <\/td>\n<\/tr>\n
25<\/td>\nTables
Table 1 \u2013 Influence parameter ranges (10 min averages) of classes A, B, C, D and S <\/td>\n<\/tr>\n
26<\/td>\n6.5 Reporting format
7 Assessment of cup and sonic anemometry
7.1 General
7.2 Measurements of anemometer characteristics
7.2.1 Measurements in a wind tunnel for tilt angular response characteristics of cup anemometers <\/td>\n<\/tr>\n
28<\/td>\n7.2.2 Wind tunnel measurements of directional characteristics of cup anemometers
7.2.3 Wind tunnel measurements of cup anemometer rotor torque characteristics
Figures
Figure 1 \u2013 Tilt angular response V\u03b1\/V\u03b1=0 of a cup anemometer as a function of flow angle \u03b1 compared to cosine response <\/td>\n<\/tr>\n
29<\/td>\n7.2.4 Wind tunnel measurements of step responses of cup anemometers
Figure 2 \u2013 Wind tunnel torque measurements QA \u2212 QF asa function of angular speed \u03c9 of a cup anemometer rotor at 8 m\/s <\/td>\n<\/tr>\n
30<\/td>\n7.2.5 Measurement of temperature induced effects on anemometer performance <\/td>\n<\/tr>\n
31<\/td>\n7.2.6 Wind tunnel measurements of directional characteristics of sonic anemometers
Figure 3 \u2013 Example of bearing friction torque QF asfunction of temperature for a range of angular speeds \u03c9 <\/td>\n<\/tr>\n
32<\/td>\n7.3 A cup anemometer classification method based on wind tunnel and laboratory tests and cup anemometer modelling
7.3.1 Method
7.3.2 Example of a cup anemometer model <\/td>\n<\/tr>\n
34<\/td>\nFigure 4 \u2013 Example of rotor torque coefficient CQA as a function of speed ratio \u03bb derived from step responses with \u03balow equal to \u22125,5 and \u03bahigh equal to \u22126,5 <\/td>\n<\/tr>\n
35<\/td>\nTable 2 \u2013 Tilt angle response of example cup anemometer <\/td>\n<\/tr>\n
36<\/td>\nTable 3 \u2013 Friction coefficients of example cup anemometer
Table 4 \u2013 Miscellaneous data related to classification of example cup anemometer <\/td>\n<\/tr>\n
37<\/td>\nFigure 5 \u2013 Classification deviations of example cup anemometer showinga class 1,69A (upper) and a class 6,56B (lower) <\/td>\n<\/tr>\n
38<\/td>\nFigure 6 \u2013 Classification deviations of example cup anemometer showinga class 8,01C (upper) and a class 9,94D (lower) <\/td>\n<\/tr>\n
39<\/td>\n7.4 A sonic anemometer classification method based on wind tunnel tests and sonic anemometer modelling
7.5 Free field comparison measurements
8 Wind tunnel calibration procedure for anemometers
8.1 General requirements <\/td>\n<\/tr>\n
40<\/td>\n8.2 Requirements for the wind tunnel <\/td>\n<\/tr>\n
41<\/td>\nFigure 7 \u2013 Definition of volume for flow uniformity test <\/td>\n<\/tr>\n
42<\/td>\n8.3 Instrumentation and calibration setup requirements
8.4 Calibration procedure
8.4.1 General procedure for cup and sonic anemometers <\/td>\n<\/tr>\n
43<\/td>\n8.4.2 Procedure for the calibration of sonic anemometers
8.4.3 Determination of the wind speed at the anemometer position <\/td>\n<\/tr>\n
44<\/td>\n8.5 Data analysis
8.6 Uncertainty analysis <\/td>\n<\/tr>\n
45<\/td>\n8.7 Reporting format <\/td>\n<\/tr>\n
46<\/td>\n8.8 Example uncertainty calculation
Table 5 \u2013 Example of evaluation of anemometer calibration uncertainty <\/td>\n<\/tr>\n
49<\/td>\n9 In-situ comparison of anemometers
9.1 General
9.2 Prerequisite
9.3 Analysis method <\/td>\n<\/tr>\n
50<\/td>\n9.4 Evaluation criteria <\/td>\n<\/tr>\n
51<\/td>\nFigure 8 \u2013 Example valid control anemometer direction sector for a single top-mounted anemometer on a triangular lattice meteorological mast <\/td>\n<\/tr>\n
52<\/td>\n10 Mounting of instruments on the meteorological mast
10.1 General
Figure 9 \u2013 Example valid control anemometer direction sector for a single top-mounted anemometer on a tubular meteorological mast <\/td>\n<\/tr>\n
53<\/td>\n10.2 Single top-mounted anemometer <\/td>\n<\/tr>\n
54<\/td>\n10.3 Side-by-side top-mounted anemometers
Figure 10 \u2013 Example of a top-mounted anemometer and requirements for mounting <\/td>\n<\/tr>\n
55<\/td>\nFigure 11 \u2013 Example of alternative top-mounted primary and control anemometers positioned side-by-side and wind vane and other instruments on the boom <\/td>\n<\/tr>\n
56<\/td>\n10.4 Side-mounted instruments
10.4.1 General
10.4.2 Tubular meteorological masts <\/td>\n<\/tr>\n
57<\/td>\nFigure 12 \u2013 Iso-speed plot of local flow speed arounda cylindrical meteorological mast <\/td>\n<\/tr>\n
58<\/td>\n10.4.3 Lattice meteorological masts
Figure 13 \u2013 Centreline relative wind speed as a function of distance Rd from the centre of a tubular meteorological mast and meteorological mast diameter d
Figure 14 \u2013 Representation of a three-legged lattice meteorological mast <\/td>\n<\/tr>\n
59<\/td>\nFigure 15 \u2013 Iso-speed plot of local flow speed around a triangular lattice meteorological mast with a CT of 0,5 <\/td>\n<\/tr>\n
60<\/td>\nFigure 16 \u2013 Centreline relative wind speed as a function of distance Rd from the centre of a triangular lattice meteorological mast of leg distance Lm for various CT values <\/td>\n<\/tr>\n
61<\/td>\nTable 6 \u2013 Estimation method for CT for various types of lattice mast <\/td>\n<\/tr>\n
62<\/td>\nFigure 17 \u2013 3D CFD derived flow distortion for two different wind directions around a triangular lattice meteorological mast (CT = 0,27) <\/td>\n<\/tr>\n
63<\/td>\n10.4.4 Flow distortion correction of side-mounted anemometers
10.5 Lightning protection
10.6 Mounting of other meteorological instruments <\/td>\n<\/tr>\n
64<\/td>\n10.7 Data acquisition system
11 Uncertainty of wind speed measurement
11.1 Category B uncertainties: Wind speed \u2013 Introduction
11.2 Category B uncertainties: Wind speed \u2013 Hardware
11.3 Category B uncertainties: Wind speed \u2013 Meteorological mast mounted sensors
11.3.1 General <\/td>\n<\/tr>\n
65<\/td>\n11.3.2 Pre-calibration
11.3.3 Post-calibration
11.3.4 Classification <\/td>\n<\/tr>\n
66<\/td>\n11.3.5 Mounting <\/td>\n<\/tr>\n
67<\/td>\n11.3.6 Lightning finial
11.3.7 Data acquisition
11.4 Category B uncertainties: Method \u2013 Cold climate
11.5 Combining uncertainties
11.5.1 General <\/td>\n<\/tr>\n
68<\/td>\n11.5.2 Combining uncertainties in the wind speed measurement (uV,i)
11.5.3 Combining uncertainties in the wind speed measurement from cup or sonic anemometer (uVS,i )
12 Reporting <\/td>\n<\/tr>\n
70<\/td>\nAnnex A (informative)Wind tunnel calibration procedure for wind direction sensors
A.1 General requirements
A.2 Requirements of the wind tunnel <\/td>\n<\/tr>\n
71<\/td>\nA.3 Instrumentation and calibration setup requirements <\/td>\n<\/tr>\n
72<\/td>\nA.4 Calibration procedure
Figure A.1 \u2013 Example of calibration setup of a wind direction sensor in a wind tunnel <\/td>\n<\/tr>\n
73<\/td>\nA.5 Data analysis
A.6 Uncertainty analysis <\/td>\n<\/tr>\n
74<\/td>\nA.7 Reporting format <\/td>\n<\/tr>\n
75<\/td>\nA.8 Example of uncertainty calculation
A.8.1 General
A.8.2 Measurement uncertainties generated by determination of the flow direction in the wind tunnel
A.8.3 Uncertainty contribution by uncertainties in the determination of the geometrical centreline \u03b1CL (wind tunnel centreline)
A.8.4 Contribution by uncertainties in the determination of flow direction \u03b1dir <\/td>\n<\/tr>\n
78<\/td>\nTable A.1 \u2013 Uncertainty contributions in wind directions sensor calibration <\/td>\n<\/tr>\n
79<\/td>\nTable A.2 \u2013 Uncertainty contributions and total standard uncertaintyin wind direction sensor calibration <\/td>\n<\/tr>\n
80<\/td>\nAnnex B (informative)Mast flow distortion correction for lattice masts
Figure B.1 \u2013 Example of mast flow distortion <\/td>\n<\/tr>\n
82<\/td>\nFigure B.2 \u2013 Flow distortion residuals versus wind direction <\/td>\n<\/tr>\n
83<\/td>\nAnnex C (informative)Nacelle instrument mounting
C.1 General
C.2 Preferred method of anemometer’s mounting
C.3 Preferred position of anemometer <\/td>\n<\/tr>\n
84<\/td>\nFigure C.1 \u2013 Mounting of anemometer on top of nacelle <\/td>\n<\/tr>\n
85<\/td>\nAnnex D (informative)Spinner anemometers <\/td>\n<\/tr>\n
86<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Wind energy generation systems – Wind measurement. Application of meteorological mast, nacelle and spinner mounted instruments<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2023<\/td>\n88<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":418424,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-418414","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/418414","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/418424"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=418414"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=418414"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=418414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}