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GB/T 21421.1-2021: Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V - Part 1: Standard strength classes and end fittings
Status: Valid GB/T 21421.1: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 21421.1-2021 | English | 269 |
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Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V - Part 1: Standard strength classes and end fittings
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GB/T 21421.1-2021
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| GB/T 21421.1-2008 | English | 754 |
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Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V -- Part 1: Standard strength classes and end fittings
| Obsolete |
GB/T 21421.1-2008
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PDF similar to GB/T 21421.1-2021
Basic data | Standard ID | GB/T 21421.1-2021 (GB/T21421.1-2021) | | Description (Translated English) | Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V - Part 1: Standard strength classes and end fittings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K48 | | Word Count Estimation | 13,125 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 21421.1-2021: Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V - Part 1: Standard strength classes and end fittings
---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.
Composite string insulator units for overhead lines with a nominal voltage greater than 1 000 V -- Part 1: Standard strength classes and end fittings
ICS 29:080:10
CCSK48
National Standards of People's Republic of China
Replacing GB/T 21421:1-2008
For overhead lines with nominal voltage higher than 1000V
Composite Insulator String Components Part 1:
Standard Strength Classes and End Fittings
(IEC 61466-1:2016, MOD)
Published on 2021-12-31
2022-07-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration
directory
Preface I
Introduction III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Mechanical and dimensional characteristics1
5 Standard Plan 2
6 Insulator connection symbol meaning 2
7 Logo 3
8 Composite insulator string element 3
Appendix A (informative) This document and IEC 61466-1:2016 chapter numbering list 5
Appendix B (informative) List of technical differences between this document and IEC 61466-1:2016 and their reasons 6
Appendix C (normative) Dimensional requirements for ear ring connection 7
Reference 8
Figure 1 Symbols for connection 3
Figure C:1 Earring Connection Dimensions 7
Table 1 Connection marking 4 of insulators
Table A:1 Comparison of the chapter numbers of this document and IEC 61466-1:20165
Table B:1 Technical differences between this document and IEC 61466-1:2016 and their reasons6
Table C:1 Earring connection dimensions 7
foreword
This 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 is part 1 of GB/T 21421 "Composite insulator string elements for overhead lines with a nominal voltage higher than 1000V":
GB/T 21421 has published the following parts:
--- Part 1: Standard strength classes and end fittings;
--- Part 2: Dimensions and characteristics:
This document replaces GB/T 21421:1-2008 "Composite insulator string elements for overhead lines with nominal voltage higher than 1000V No: 1"
Part: Standard strength grades and end accessories", compared with GB/T 21421:1-2008, except for structural adjustments and editorial changes, the main technical
The changes are as follows:
---According to our country's use experience, in the "Scope" chapter, "This document is also applicable to DC racks with nominal voltage higher than 1500V":
Composite insulator string elements for empty lines" (see Chapter 1);
--- Added "Chapter 3 Terms and Definitions" (see Chapter 3);
---According to the actual use of products in my country, the mechanical strength grades of 400kN and 530kN were standardized and changed to
420kN and 550kN (see Chapter 5, Table 1, Chapter 4, Table 1 and Appendix A of the:2008 edition);
---Because rod-shaped suspension composite insulators with strength grades of 840kN and 1000kN have been used in my country, this document will
Two mechanical strength grades are included, and the corresponding connection marks are added (see Chapter 5, Chapter 8);
---According to the actual use of products in my country, the content of Table 1 has been modified, and the "Appendix A Connection Mark" and "Appendix A" in the table have been deleted:
In the column of "Connection Mark" and "Y-shaped Appendix C Connection Mark" in Record B, the corresponding content of the earring connection mark has been modified (see Table 1);
--- Deleted all the appendices of the:2008 edition, because these appendices provide the connection dimensions commonly used in North America, which are not suitable for our country's
The actual situation of the product (see Appendix A, Appendix B, Appendix C and Appendix D of the:2008 edition);
--- Added Appendix C (normative), which provides the series dimensions of earring connections commonly used in my country according to the actual situation of our products
necessary information (see Appendix C):
This document uses the redrafted method to modify and adopt IEC 61466-1:2016 "Composite insulation for overhead lines with nominal voltage higher than 1000V"
Edge substring elements - Part 1: Standard strength classes and end fittings:
This document is structurally adjusted compared to IEC 61466-1:2016: Appendix A lists this document and IEC 61466-1:2016
The chapter number comparison list:
There are technical differences between this document and IEC 61466-1:2016, and the clauses involved in these differences have been specified in the outer margins
The vertical single line (∣) of the position is marked, and a list of the corresponding technical differences and their reasons is given in Appendix B:
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 Co:, Ltd:, China Southern Power
Network Science Research Institute Co:, Ltd:, Electric Power Planning and Design Institute, State Grid Zhejiang Electric Power Company Electric Power Research Institute, Changyuan High Energy Electric
Co:, Ltd:, Xiangyang State Grid Synthetic Insulator Co:, Ltd:, Guangzhou Maikeling Electric Power Equipment Co:, Ltd:, Zibo Taiguang Electric Appliances
Materials Co:, Ltd:, Jiangsu Xiangyuan Electric Equipment Co:, Ltd:, Dalian Insulator Group Power Transmission and Transformation Materials Co:, Ltd:, Nanjing Electric Insulator Co:, Ltd:
Ren Company, Suzhou Electric Porcelain Factory Co:, Ltd:, China Railway Research Institute Group Co:, Ltd: Locomotive and Rolling Stock Research Institute, China Electric Power Engineering Co:, Ltd:
Consulting Group Southwest Electric Power Design Institute Co:, Ltd:, Wenzhou Yikun Electric Co:, Ltd:, Xi'an Xidian High Voltage Bushing Co:, Ltd:, State Grid Jiangsu Province
Electric Power Research Institute of Electric Power Company, Electric Power Research Institute of State Grid Sichuan Electric Power Company, Shaanxi Electric Power Construction Group Co:, Ltd:, Baoding Beijing
Baoding Power Equipment Co:, Ltd:, Jiangsu Jinsanli Power Equipment Industry Co:, Ltd:, Baoding Huatie Electric Power Supply Equipment Co:, Ltd:,
Henan Pinggao Electric Co:, Ltd:, Xi'an High-Strength Insulation Electric Co:, Ltd:, Tangshan High Voltage Electric Porcelain Co:, Ltd:
The main drafters of this document: Liu Zhiqiang, Li Qingfeng, Luo Bing, Wei Peng, Li Yongshuang, Deng Tao, Wang Shaohua, Wang Muxi, Yang Hongjun, Ouyang Xudan,
Wei Xia, Liu Tieqiao, Bo Xuewei, Zhang Shangang, Qi Dongbao, Zhang Rui, Lu Zhou, Zhao Hui, Guo Chenxi, Li Li, Yu Mingxuan, Wang Yunpeng, Chen Linshan, Gao Song,
Liu Xi, Nie Zhaozhong, Liu Qinghua, Yan Shanzhi, Song Xuchao, Zhang Qian, Dang Zhenping, Yao Junrui, Hu Wenqi, Liu Di, Liu Zhanmin, Li Yawei, Zhang Bin,
Li Te, Xu Wenrong, Liu Yang, Zhao Yiping:
The previous versions of this document and its superseded documents are as follows:
---First published in:2008 as GB/T 21421:1-2008;
---This is the first revision:
Introduction
Composite insulators for overhead lines with nominal voltage higher than 1000V cover insulator elements, insulator strings and insulator string groups:
The composite insulator string element for AC system can be used alone as an insulator string, or multiple elements can be combined into an insulator string, insulation
Substring group usage:
GB/T 19519 "Overhead line insulator nominal voltage higher than 1000V AC system with suspension and tensile composite insulator stator
Definition, Test Methods and Acceptance Criteria" specifies the definition, test methods and acceptance criteria of composite insulators for AC overhead lines:
GB/T 34937 "Overhead line insulator nominal voltage higher than 1500V DC system with suspension and tensile composite insulator stator
Definition, test methods and acceptance criteria" specifies the definition, test methods and acceptance criteria of composite insulators for DC overhead lines:
GB/T 21421 "Composite insulator string elements for overhead lines with nominal voltage higher than 1000V" stipulates that composite insulators for overhead lines are
Characteristics of insulators, such product characteristics generally include two categories: one is the strength level and connection form and size considering interchangeability; the other is
It is the standardized size, mechanical strength, electrical properties and other characteristics: Therefore, GB/T 21421 "Overhead lines with nominal voltage higher than 1000V"
The composite insulator string element is composed of two parts:
--- Part 1: Standard strength classes and end fittings:
--- Part 2: Dimensions and characteristics:
For overhead lines with nominal voltage higher than 1000V
Composite Insulator String Components Part 1:
Standard Strength Classes and End Fittings
1 Scope
This document specifies the specified values for the mechanical properties of composite insulator string elements and the main dimensions used in the connection of composite insulator string elements:
inch, so that insulators and end fittings from different manufacturers can be assembled and interchanged:
This document also specifies the standard connection notation for composite insulator string elements:
Note 1: See the relevant product standards for general provisions and methods of testing:
Note 2: This document only refers to the necessary dimensions of the connection assembly, and does not specify the material properties and working loads: Table 1 gives the dimensions of the end fittings and strength classes:
inch match:
This document applies to composite insulator string elements for AC overhead lines with a nominal voltage higher than 1000V and a frequency not exceeding 100Hz:
And composite insulator string components for DC overhead lines with nominal voltage higher than 1500V:
This document also applies to insulators of similar design used in substations or electric traction lines:
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations
documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to
this document:
GB/T 2900:8-2009 Electrical terminology insulators (IEC 60050-471:2007, IDT)
GB/T 4056-2019 Ball and socket connection dimensions of insulator string elements (IEC 60120:1984, MOD)
GB/T 19519-2014 Overhead line insulators with nominal voltage higher than 1000V AC system with overhang and tensile composite insulation
Sub-definitions, test methods and acceptance criteria (IEC 61109:2008, MOD)
GB/T 22079-2019 General definitions, test methods and acceptance criteria for high-voltage polymer insulators for indoor and outdoor use
(IEC 62217:2012, MOD)
GB/T 25317-2010 Groove connection dimensions of insulator string elements (IEC 60471:1977, IDT)
3 Terms and Definitions
Terms and definitions defined in GB/T 2900:8-2009, GB/T 22079-2019 and GB/T 19519-2014 apply to this document:
4 Mechanical and dimensional characteristics
The specified characteristics of composite insulator string elements are as follows:
--- Specified mechanical load (SML);
--- Standard connection:
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