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GB/T 46242-2025 English PDF

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GB/T 46242-2025: Wind energy generation systems - Power performance assessment of obstacles and terrain
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Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 46242-2025	English	434	Add to Cart	4 days [Need to translate]	Wind energy generation systems - Power performance assessment of obstacles and terrain	Valid	GB/T 46242-2025

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Basic data

Standard ID	GB/T 46242-2025 (GB/T46242-2025)
Description (Translated English)	Wind energy generation systems - Power performance assessment of obstacles and terrain
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	F11
Classification of International Standard	27.180
Word Count Estimation	22,296
Date of Issue	2025-10-05
Date of Implementation	2025-10-05
Issuing agency(ies)	State Administration for Market Regulation and Standardization Administration of China

GB/T 46242-2025: Wind energy generation systems - Power performance assessment of obstacles and terrain

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT46242-2025
ICS 27.180 CCSF11 National Standards of the People's Republic of China Wind power generation system power characteristic test obstacles and Topographical assessment obstacles and terrain Published on 2025-10-05 Implemented on October 5, 2025 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Preface III Introduction IV 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Symbols, Units, and Abbreviations 2 5 General Principles 3 6.Measurement sector procedure for power characteristic testing according to IEC 61400-12-1 4 6.1 General Rules 4 6.2 Requirements when there are nearby operating wind turbine generators 4 6.3 Requirements when there are obstacles 5 6.4 Calculation method for excluded sectors 5 6.5 Special requirements for extent barriers 8 7.Measurement sector procedure used to determine the nacelle wind speed transfer function (NTF) between free-flow wind speed and nacelle wind speed. 8. 8.Measurement sector procedure used in determining the nacelle power curve (NPC) 8 8.1 General Rules 8.2 Requirements for nearby operating wind turbine generators 9 8.3 Requirements regarding obstacles 9 8.4 Calculation of sectors to be removed 10 8.5 Measurement Sector Self-Consistency Verification Procedure 10 9.Test Site Topography Assessment 11 10 Terrain rating for NTF and NPC 13 10.1 Overview 13 10.2 RIX index 13 10.3 Mean dip angle 13 10.4 Determination of Topographic Classification 14 10.5 Ridge 15 Figure 1.Sector 6 where wakes are eliminated due to proximity to operating wind turbines and large obstacles. Figure 2.Sector excluded due to wakes from the tested wind turbine, nearby operating wind turbines, and large obstacles. Figure 3.Example 11 of the self-consistency check results for a sector. Figure 4.Site assessment area diagram, top view 12 Figure 5.Dip angle and topographic variations determined by the best-fit plane within the “2L~4L” and “Measurement Sector” (Table 5, row 2) 12 Figure 6.Tilt angle determination for “2L~4L” and “8L~16L” cases outside the “measurement sector” (Table 5, rows 3 and 5) 13 Table 1.Other International Standards Referring to This Document 3 Table 2 Interfaces between this document and other international standards 4 Table 3 Obstacle Requirements. Obstacle Relevance 5 Table 4 Obstacle Requirements. Obstacle Relevance 9 Table 5 Test Site Requirements. Topographical Changes 12 Table 6 Slope Terrain Level 14 Table 7 RIX Terrain Level 14 Table 8 Final Terrain Level 14 Table 9.Impact of the largest ridge step on topographic classification 15

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is equivalent to IEC 61400-12-5.2022 "Wind power generation systems - Part 12-5.Power characteristics - Obstacles and terrain". Evaluate". The following minimal editorial changes have been made to this document. ---To align with existing standards, the standard name has been changed to "Obstacle and Terrain Assessment for Power Characteristic Testing of Wind Power Generation Systems". Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Technical Committee on Standardization of Wind Power (SAC/TC50). This document was drafted by. China Electric Power Research Institute Co., Ltd., Huaneng Shanwei Wind Power Generation Co., Ltd., and CRRC Zhuzhou Electric Locomotive Co., Ltd. Wind Power Division of Research Institute Co., Ltd., Hunan Xinglan Wind Power Co., Ltd., Mingyang Smart Energy Group Co., Ltd., and CSSC Offshore & Marine Engineering Wind Power Co., Ltd. The company, Beijing Certification & Inspection Group Co., Ltd., Shanghai Electric Wind Power Group Co., Ltd., Goldwind Technology Co., Ltd., and Shanghai Certification & Inspection Group Co., Ltd. Shangke New Energy Technology Co., Ltd., CRRC Shandong Wind Power Co., Ltd., Windey Energy Technology Group Co., Ltd., China Quality Certification Center Xin Co., Ltd., and Chongqing Qianjiang District Three Gorges New Energy Power Generation Co., Ltd. The main drafters of this document are. Xue Yang, Wu Xurui, Wang Lei, Huang Lingxiang, Zou Libing, Fu Xinhong, Kong Lingxing, Pang Mengzhi, Zhao Na, and Liu Yuntao. Li Yafei, Zheng Haifeng, Huang Jiewei, Jing Zhongdong, Deng Yu, Tong Weiyin, Wang Ying, Bai Han.

introduction

The purpose of this document is to describe how to determine, for a specific wind turbine generator, its independence from obstacles or other wind turbine generators. The procedure for measuring sectors. Measurement sectors are used to assess the terrain and determine if site marking is required; these sectors can also be used for wind power generation. Power characteristic assessment of the unit. Chapter 6 describes a procedure for identifying one or more sectors that are not suitable for power characteristic measurements because the wind force being measured... The airflow at the location of the generator set and/or the airflow at the location of the wind measuring equipment (such as a wind tower or remote sensing equipment) may be affected by the wind force during operation. The impact of the motor set and/or obstacles. Chapter 7 describes the procedure for establishing measurement sectors during the determination of the nacelle wind speed transfer function. Chapter 8 describes the procedure for establishing measurement sectors during the determination of the nacelle power curve. Chapter 9 describes methods for assessing the terrain surrounding a site and determining whether it is complex and whether site marking is required. Calibration is typically used to measure changes in the boundary layer, as it follows topographic variations, often accompanied by flow, while obstacles usually generate their associated effects. More turbulent wakes, which are affected by sharp edges and vertical surfaces that can cause turbulence. Chapter 10 describes a method for classifying the terrain in order to apply the nacelle wind speed transfer function to nacelle power curve measurements. The level is used to estimate the uncertainty of the nacelle wind speed transfer function (NTF) and the nacelle power curve (NPC), and also to determine the terrain conditions. The NTF can be used by NPCs. Wind power generation system power characteristic test obstacles and Topographical assessment 1.Scope This document from the IEC 61400 series specifies the procedures for assessing the importance of obstacles and terrain changes at power characteristic test sites, and is also applicable to... This procedure is used for performance testing of all types and sizes of grid-connected wind turbine generators described in other documents of the IEC 61400 series. Performance evaluation of specific wind turbine generators applicable to specific locations.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. IEC 61400-12-1 Wind power generation systems – Part 12-1.Test of power characteristics of wind turbine generators (Windenergygenera- Note. GB/T 18451.2-2025 Power characteristic test of wind turbine generator sets for wind power generation systems (IEC 61400-12-1.2022, IDT) IEC 61400-12-2 Wind power generation systems – Part 12-2.Power characteristic testing of wind turbine generators based on nacelle anemometer method Note. GB/T 33225-2025 Power Characteristic Test of Wind Turbine Generators Based on Nacelle Anemometer Method (IEC 61400-12-2) 2022, IDT) IEC 61400-12-3 Wind power generation systems – Part 12-3.Site calibration for power characteristic tests (Windenergy) Note. GB/T 46245-2025 Field calibration of power characteristic test for wind power generation systems (IEC 61400-12-3.2022, IDT) IEC 61400-12-6 Wind power generation systems – Part 12-6.Measurement of wind speed transfer function in wind turbine nacelles (Wind (ducingwindturbines) Note. GB/T 46241-2025 Measurement of wind speed transfer function of wind turbine nacelle in wind power generation system (IEC 61400-12-6.2022, IDT) 3.Terms and Definitions The following terms and definitions apply to this document. 3.1 Complex terrain The test site is surrounded by areas or obstacles with significant topographical changes that could cause airflow distortion. 3.2 Cut-in wind speed The minimum wind speed at which a wind turbine can start generating electricity.

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