IEC 61400-12-1:2022/COR1:2025

© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 61400-12-1 IEC 61400-12-1
Edition 3.0  2022-09 Édition 3.0  2022-09

WIND ENERGY GENERATION SYSTEMS SYSTÈMES DE GÉNÉRATION D'ÉNERGIE
ÉOLIENNE
Part 12-1: Power performance measurements Partie 12-1: Mesurages de performance de
of electricity producing wind turbines puissance des éoliennes de production
d'électricité
CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à la version française sont données après le texte anglais.

4 Symbols, units and abbreviated terms
Replace the lines
sensitivity factor for relative humidity in bin i
c
RH,i
T average temperature in bin i
i
ρ average air density in bin i
i
Φ relative humidity (range 0 % to 100 %)
Φ average relative humidity (range 0 % to 100 %) in bin i
i
with
c sensitivity factor for relative humidity in bin i [W / %RH]
RH,i
T average temperature in bin i [K]
i
ρ average air density in bin i [kg/m ]
i
Φ relative humidity (range 0 % to 100 % or 0 to 1)
Φ average relative humidity (range 0 % to 100 % or 0 to 1) in bin i
i
Annex D − Evaluation of uncertainty in measurement
In Table D.1, under "Wind speed (cup and sonic anemometer)", add "Lightning finial" in the
second column and "B" in the last column.
IEC 61400-12-1:2022-09/COR1:2025-05(en-fr)

– 2 – IEC 61400-12-1:2022/COR1:2025
© IEC 2025
Annex E − Theoretical basis for determining the uncertainty of measurement
using the method of bins
E.5 Category B uncertainties: Power output
E.5.1 General
Replace the fourth paragraph starting with "Further, an uncertainty component due to the
dynamic behaviour"
with
"Finally the uncertainty related to the data acquisition of the power signal shall be added.".
E.9 Category B uncertainties: Wind speed – Terrain
E.9.1 General
Replace the sixth paragraph
In this case this uncertainty component related to the terrain has nine sub-components
with
In this case this uncertainty component related to the terrain has ten sub-components.
Add the following new item to the list:
j) uncertainty related to the lightning finial.
E.10.2 Category B uncertainties: Air density – Temperature – Introduction
After Equation (E.17), replace
v is the average wind speed in bin i;
i
with
v is the average wind speed in bin i, site-calibrated and normalized for air density, shear,
i
veer, and/or turbulence, as the case may be;
Add, after the definition of terms for Equation (E.17), the following new note:
NOTE 1 Units are defined in Clause 4.
After Equation (E.18), replace
P is the sensitivity factor for wind speed in bin i;
i
with
P is the normalized and averaged power output in bin i;
i
Add, after the definition of terms for Equation (E.18), the following new note:
NOTE 2 Units are defined in Clause 4.

© IEC 2025
E.10.7 Category B uncertainties: Air density – Pressure – Introduction
After Equation (E.19), replace
v is the average wind speed in bin i;
i
with
v is the average wind speed in bin i, site-calibrated and normalized for air density, shear,
i
veer, and/or turbulence, as the case may be;
Add, after the definition of terms for Equation (E.19), the following new note:
NOTE 1 Units are defined in Clause 4.
Add, after the definition of terms for Equation (E.20), the following new note:
NOTE 2 Units are defined in Clause 4.
E.10.11 Category B uncertainties: Air density – Relative humidity – Introduction
After Equation (E.21), replace
v is the average wind speed in bin i;
i
with
v is the average wind speed in bin i, site-calibrated and normalized for air density, shear,
i
veer, and/or turbulence, as the case may be;
Add, after the definition of terms for Equation (E.21), the following new note:
NOTE 1 Units are defined in Clause 4.
Add, after the definition of terms for Equation (E.22), the following new note:
NOTE 2 Units are defined in Clause 4.
E.13.2 Combining Category B uncertainties in electric power (u )
P,i
In first paragraph, replace
"….the current and voltage transformers, the dynamic behaviour and the data acquisition
system:"
with
"….the current and voltage transformers, and the data acquisition system:".
Annex R − Uncertainty considerations for tests on multiple turbines
In Table R.1, delete the fourth row for "Dynamic power measurement".

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