GB/T 24622-2022 English PDFUS$359.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 24622-2022: Guidance on the measurement of hydrophobicity of insulator surfaces Status: Valid GB/T 24622: Historical versions
Basic dataStandard ID: GB/T 24622-2022 (GB/T24622-2022)Description (Translated English): Guidance on the measurement of hydrophobicity of insulator surfaces Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K48 Word Count Estimation: 18,186 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 24622-2022: Guidance on the measurement of hydrophobicity of insulator surfaces---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Guidance on the measurement of hydrophobicity of insulator surfaces ICS 29.080.10 CCSK48 National Standards of People's Republic of China Replacing GB/T 24622-2009 Guidelines for Measuring Hydrophobicity of Insulator Surfaces (IEC TS62073.2016, MOD) Published on 2022-03-09 2022-10-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Preface I Introduction II 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Measurement method of hydrophobicity 2 4.1 General 2 4.2 Method A---Contact Angle Method 3 4.3 Method B---Surface Tension Method 4 4.4 Method C---Spray Method 5 4.5 Preparation of measurement reports 6 Appendix A (normative) Guidance on applicability and assessment of limitations of the various approaches listed in this document8 A.1 General 8 A.2 Typical results obtained with three methods8 Appendix B (normative) Method A---Contact Angle Method 10 Appendix C (normative) Method B---Surface Tension Method 11 Appendix D (normative) Method C---Spray Method 13 Reference 14 forewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" drafted. This document replaces GB/T 24622-2009 "Guidelines for the measurement of surface wettability of insulators". Compared with GB/T 24622-2009, In addition to structural adjustments and editorial changes, the main technical changes are as follows. --- Use the term "hydrophobicity" instead of "wetting", "hydrophobicity grade (HC)" instead of "wetting grade (WC)" (see 3.1 and 3.5, 2.1 and 2.6 of the.2009 edition); --- In "3 Terms and Definitions", only the term "surface tension" is retained, the term "interfacial tension" is deleted, and part of the content is changed to Notes to this term (see 3.3, 2.3 of the.2009 edition); --- Deleted "recommended value of 50 μL" (see 3.2.3.1); --- Modify "the ratio between length and width should not be greater than 1.3" in 4.4.3 to "the ratio between length and width should not be greater than 3.1" (See 4.4.3, 3.4.3 of the.2009 edition); --- Changed the corresponding value between the back contact angle and the hydrophobicity grade in the criteria for determining the hydrophobicity grade (HC) in Table 1 (see Table 1). This document is modified and adopted IEC TS62073.2016 "Guidelines for Measurement of Hydrophobicity of Insulator Surfaces", and the document type is based on IEC technical specifications. Adjusted to my country's national standard. This document adds a chapter "Normative References". The technical differences between this document and IEC TS62073.2016 and their reasons are as follows. ---Although different droplet volumes need to be selected according to the corresponding surface state, IEC TS62073.2016 3.2.3.1 "recommended The value of 50 μL” is not in line with the actual situation, therefore, in 4.2.3d) of this document, the “recommended value of 50 μL” is deleted to adapt to our country specific situation; --- In 4.4.3, "the ratio between length and width should not be greater than 1.3" is revised to "the ratio between length and width should not be greater than 3.1". Please note that some content of this document may be patented. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Standardization Technical Committee of Insulators (SAC/TC80). This document is drafted by. Xi'an High Voltage Electric Apparatus Research Institute Co., Ltd., China Electric Power Research Institute, China Southern Power Grid Research Institute Co., Ltd., General Electric Power Planning and Design Institute, State Grid Zhejiang Electric Power Company Electric Power Research Institute, Guangzhou Maikeling Electric Power Equipment Co., Ltd. Company, Dalian Insulator Group Power Transmission and Transformation Materials Co., Ltd., Xiangyang State Grid Synthetic Insulator Co., Ltd., Changyuan High Energy Electric Co., Ltd. Company, Zibo Taiguang Electric Power Equipment Factory, Nanjing Electric Insulator Co., Ltd., State Grid Sichuan Electric Power Company Electric Power Research Institute, State Grid Electric Power Research Institute of Jiangsu Electric Power Company, Xi'an Xidian High Voltage Bushing Co., Ltd., Jiangsu Xiangyuan Electric Equipment Co., Ltd., Suzhou Electric Porcelain Factory Co., Ltd., China Railway Research Institute Group Co., Ltd. Locomotive and Rolling Stock Research Institute, China Electric Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd., Wenzhou Yikun Electric Co., Ltd., Shaanxi Electric Power Construction Group Co., Ltd., Baoding Jingbao Power Equipment Co., Ltd., Jiangsu Jinsanli Electric Power Equipment Industry Co., Ltd., Baoding Huatie Electric Power Supply Equipment Co., Ltd., Henan Pinggao Electric Co., Ltd. Company, Xi'an High-Strength Insulation Electric Co., Ltd., Tangshan High-voltage Electric Porcelain Co., Ltd. The main drafters of this document. Jing Qian, Deng Tao, Wei Peng, Luo Bing, Zhang Rui, Li Yongshuang, Li Te, Ouyang Xudan, Bo Xuewei, Yang Hongjun, Wang Muxi, Wei Xia, Cai Hailong, Chen Hongbo, Chen Linshan, Gao Song, Zhao Hui, Liu Tieqiao, Zhang Shangang, Qi Dongbao, Zhou Jun, Wu Guangya, Lu Zhou, Guo Chenxi, Li Li, Yu Mingxuan, Wang Yunpeng, Liu Xi, Nie Zhaozhong, Liu Qinghua, Yan Shanzhi, Song Xuchao, Zhang Qian, Dang Zhenping, Yao Junrui, Hu Wenqi, Wang Shaohua, Xu Weixing, Liu Di, He Qingwen, Zhang Changzheng, Li Yawei, Zhao Yiping, Liu Yang, Zhang Bin, Liu Zhanmin. The previous versions of this document and its superseded documents are as follows. ---First published in.2009 as GB/T 24622-2009; ---This is the first revision.IntroductionThe water-wetting properties of a surface are generally described by the terms hydrophobic (or hydrophobic) and hydrophilic (or hydrophilic). A hydrophobic surface is water repellent, In contrast, surfaces with high surface tension surface states that are easily wetted by water are hydrophilic. Surface wetting is complex and affected by many different parameters. Some important parameters include. insulator material type, surface roughness, Surface inhomogeneity, chemical composition (eg, due to ageing) and the presence of contamination. Some commonly used materials for insulators are affected by the surrounding conditions. Its hydrophobicity will change with time. This change can be reversible or irreversible. Therefore, the measurement results of hydrophobicity can be Energy can be affected by ambient conditions and high voltage corona, as well as dry band caused by pre-existing arcing on the insulator. Dynamics of different insulator materials State hydrophobicity is more or less different. The materials of insulators exhibit different dynamic wetting characteristics due to their different chemical compositions. Different processes, e.g. oxidation, hydrolysis, low molecular weight migration of chemical compounds, formation of complexes such as between siloxane and water, rotation of flexible polymer chains, inter- and intra-molecular rearrangements, Microbial growth, deposition of contaminants, attachment and coating of contaminant particles, etc. occur at different rates and depend on the material and surrounding conditions. pieces. Due to different exposure conditions such as sunlight, rain, corona discharge, pollutant deposition, etc., the hydrophobicity of each position on the insulator will be different. different. Therefore, the insulator hydrophobicity measurement is usually carried out in different areas of the insulator. The laboratory uses specially prepared samples to measure the surface hydrophobicity. The surfaces of these samples should be uniform, smooth and flat for easy measurement. to the actual Insulators, this measurement is made without destroying the insulator (cutting the material sample is generally not desired). This measurement condition is not complete, because And high-precision measurement is a challenge. Especially for insulation installed on overhead lines, substations, and even high-voltage test equipment in the laboratory measurement is more difficult. Guidelines for Measuring Hydrophobicity of Insulator Surfaces1 ScopeThis document describes three methods that can be used to determine the hydrophobicity of insulators. Determination of the ability of water to wet the surface of an insulator can be used to evaluate In the state of the surface of the insulator, or as part of the insulator test in the laboratory. This document applies to the measurement of the hydrophobicity of the umbrella and umbrella cover materials of composite insulators for overhead lines, substations and electrical equipment. For the measurement of the hydrophobicity of the porcelain insulator with or without the coating, the measured value represents the hydrophobicity of the test sample at the moment of measurement.2 Normative referencesThere are no normative references in this document.3 Terms and DefinitionsThe following terms and definitions apply to this document. 3.1 hydrophobicity It has a low surface tension surface state, so it is repellent to water. 3.2 surface tension In a layer of a certain thickness (generally less than 0.1μm), the structure and energy change continuously from this phase to another phase. Note. The pressure (force field) gradient in the interface region is perpendicular to the interface boundary. A net energy is required for the transfer of species from this phase to the interfacial region to form the interface. forming unit The reversible work required at the interface (surface) is the surface tension, and its thermodynamic definition is as follows. γ= ∂G ∂AT·P·n where. γ --- surface (interfacial) tension or surface energy; G---total Gibbs free energy of the system; A---surface (interface) area; T---temperature; P---pressure; N---the number of moles of substance in the system. Surface tension (γ) is usually expressed in mN/m, 1mN/m=1dyn/cm. 3.3 static contact angle When the droplet stays on the solid surface and the surface tension of the solid, liquid and gas phases reaches equilibrium, the boundary between the gas-liquid and the liquid-solid boundary angle. NOTE 1 These forces act in specific directions on the corresponding surface due to surface tension. As can be seen from Figure 1. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 24622-2022_English be delivered?Answer: Upon your order, we will start to translate GB/T 24622-2022_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 24622-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 24622-2022_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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