Amendment 1 - Wind turbines - Part 13: Measurement of mechanical loads

Amendement 1 - Éoliennes - Partie 13: Mesurage des charges mécaniques

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Status
Published
Publication Date
02-Dec-2021
Current Stage
PPUB - Publication issued
Completion Date
03-Dec-2021
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IEC 61400-13:2015/AMD1:2021 - Amendment 1 - Wind turbines - Part 13: Measurement of mechanical loads
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IEC 61400-13
Edition 1.0 2021-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Wind turbines –
Part 13: Measurement of mechanical loads
Éoliennes –
Partie 13: Mesurage des charges mécaniques
IEC 61400-13:2015-12/AMD1:2021-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61400-13
Edition 1.0 2021-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Wind turbines –
Part 13: Measurement of mechanical loads
Éoliennes –
Partie 13: Mesurage des charges mécaniques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.180 ISBN 978-2-8322-1054-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61400-13:2015/AMD1:2021
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WIND TURBINES –
Part 13: Measurement of mechanical loads
AMENDMENT 1
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

This amendment has been prepared by IEC technical committee 88: Wind energy generation

systems.
The text of this amendment is based on the following documents:
Draft Report on voting
88/795/CDV 88/821/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this Amendment is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

---------------------- Page: 4 ----------------------
IEC 61400-13:2015/AMD1:2021 – 3 –
© IEC 2021

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications/.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 5 ----------------------
– 4 – IEC 61400-13:2015/AMD1:2021
© IEC 2021
INTRODUCTION

This amendment to IEC 61400-13:2015 addresses the errors found in Annex B which impact a

significant portion of that annex.
---------------------- Page: 6 ----------------------
IEC 61400-13:2015/AMD1:2021 – 5 –
© IEC 2021
Annex B
(informative)
Procedure for the evaluation of uncertainties
in load measurements on wind turbines
B.2.3 Total uncertainty
B.2.3.3 Total uncertainty
Replace Equation (B.7) with the following new equation:
(B.7)
uu+ u
t cal sig
B.3 Uncertainties of binned averaged values
B.3.3 Uncertainty of the bin scatter
Replace Equation (B.8) with the following new equation:
u = stdev / N (B.8)
scat sig
B.3.4 Uncertainty of the x-axis quantity
Replace Equation (B.9) with the following new equation:
y - y
ii-1
uu ×
(B.9)
x x,i
xx-
ii-1
B.3.5 Uncertainty of bin averaged mean values
Replace Equation (B.10) with the following new equation:
22 2
(B.10)
U = uu++ u
mean t scat x
B.5 Examples of an uncertainty evaluation
B.5.1 Example for analytical shunt calibration of tower torque
B.5.1.1 Uncertainty components
Replace Table B.1 with the following table:
---------------------- Page: 7 ----------------------
– 6 – IEC 61400-13:2015/AMD1:2021
© IEC 2021
Table B.1 – Uncertainty components
Quantity Symbol Uncertainty Unit Source of Category Distribution Comment
information
Material parameters, cross section geometry and gauges factor in an installation
Gauges 1 % Datasheet B Gaussian –
factor
Misalignment 3 ° Estimation B Rectangular –
sens
Diameter at 2,5 mm Estimation B Gaussian –
cross section
Wall 0,1 mm Estimation B Gaussian –
thickness at
cross section
Young 5 % Estimation B Gaussian –
modulus
Poisson ratio 5 % Estimation B Gaussian –
Amplifier calibration
Amplifier and 0,1 % Datasheet / B Gaussian Measurement
sig
gain
measurement Calibration value
uncertainty certificate
concerning
gain
Amplifier and 0,1 % Datasheet / B Rectangular Upper value
sig
offset
measurement Calibration of the
uncertainty measurement
certificate
concerning range 10 V
offset
Quantization ≈0,3 mV Datasheet B Rectangular 16 Bit A/D
resolution converter,
measurement
(Offset)
range ±10 V
Calibration Datasheet / Value shunt
0,1 % B Gaussian
device Calibration resistant
certificate
Gauges 1 % Datasheet B Gaussian
resistance
Signal uncertainty
Signal Tests, A Gaussian Evaluation
uncertainty statistics, according to
estimations B.2.3.2
B.5.1.2 Calibration uncertainty of an analytical calibration
Replace Equation (B.11) with the following new equation:
M= G ×SM××ε 2
(B.11)
Replace Equation (B.13) with the following new equation:
M=G× SM××
(B.13)
---------------------- Page: 8 ----------------------
IEC 61400-13:2015/AMD1:2021 – 7 –
© IEC 2021
Replace Equation (B.14) with the following new equation:
2 U
G × SM × ×
SS× (B.14)
M V
shunt
Replace Equation (B.16) with the following new equation:
2 U
G × SM × × × F
t sens
SS× (B.16)
shunt
Replace Equation (B.18) with the following new equation:
12 U
× SM × ×
21×+ v kU
∂S ( )
× S (B.18)
∂E ΔS
shunt
Replace Equation (B.19) with the following new equation:
-1 2 U
E × SM × × ×
21×+ v i
( )
× S
(B.19)
∂vSΔ
shunt
Replace Equation (B.20) with the following new equation:
2 U
G × ×
∂S kU
M i
× S (B.20)
∂SM ΔS
t shunt

Replace the existing text "This lead" at the beginning of the sentence above Equation (B.22)

with "This leads".
Replace Equation (B.22) with the following new equation:
2 U
G ××SM
∂S kU
× S (B.22)
∂DSΔ
i shunt
Replace Equation (B.23) with the following new equation:
2 U
G ××SM
∂S kU
M i
× S (B.23)
∂TSΔ
W shunt
---------------------- Page: 9 ----------------------
– 8 – IEC 61400-13:2015/AMD1:2021
© IEC 2021
Replace Equation (B.24) with the following new equation:
-2 U
G × SM × ×
∂SU
× S (B.24)
∂k ΔS
shunt
Replace Equation (B.25) with the following new equation:
2 U
G × SM × ×
∂S kU
(B.25)
× S
∂RSΔ
SG shunt
Replace Equation (B.26) with the following new equation:
2 U
G × SM × ×
∂S kU
× S (B.26)
∂RSΔ
SH shunt
Replace Equation (B.27) with the following new equation:
2 U
G × SM × ×
∂S kU
× S (B.27)
∂FSΔ
sens shunt
Replace Equation (B.29) with the following new equation:
G × SM × ×
∂S kU
× S (B.29)
∂SSΔ
gain shunt
Replace Equation (B.32) with the following new equation:
2 U
G × SM × ×
22 i
uu=×× R
(B.32)
offset sig M
offset
shunt

Replace Table B.2 with the following table (uncertainty values modified for u and and

calibration device unit value and value changed):
---------------------- Page: 10 ----------------------
IEC 61400-13:2015/AMD1:2021 – 9 –
© IEC 2021
Table B.2 – Values and uncertainties for the calculation
Quantity Symbol Value Unit Symbol Uncertainty Unit Comment
Quantity Value Uncertainty Uncertainty
Material parameters, cross section geometry and gauges factor in an installation
Gauges factor k 2,1 – 1 %
Misalignment α – – 3 ° See
sens
Figure B.1
Inner D 4 m 0,002 5 m See
i u
diameter at Figure B.1
cross section
Wall T 0,03 m 0,000 1 m See
w u
thickness at Figure B.1
cross section
Young E 210E9 5 %
N/m
modulus
Poisson ratio ν 0,27 – 5 %
Amplifier calibration
Amplifier and – – – 0,1 % Measurement
sig
gain
measurement value
uncertainty
concerning
gain
Amplifier and – 10 V 0,1 % Upper value
sig
offset
measurement of the
uncertainty measurement
concerning range 10 V
offset
Quantization – ±10 V ≈0,3 mV 16 Bit A/D
resolution converter,
measurement
range ±10 V
Calibration R 1 00 kOhm 0,1 % Shunt
SH u
device resistance
Gauges R 350 Ohm 1 %
SG u
resistance
Replace Equation (B.33) with the following new equation:
2 2
∂S m³ Nm
     
2 10 -5 11
u = 1,05×10×3,55×10 = 1,39×10 (B.33)
E      
∂E VV
     
Replace Equation (B.34) with the following new equation:
2 22
 ∂S   Nm   Nm 
2 M 6 9
u = 0,013 5××-5,88 10 =6,30×10 (B.34)
ν      
∂ν VV
     
Replace Equation (B.35) with the following new equation:
 
∂S Nm Nm
   
2 67
u = 0,001 25××7,46 10 =8,71×10
(B.35)
 
D    
∂D VV
   
 
------
...

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