GB/T 26218.4-2019Selection and dimensioning of high-voltage insulators intended for use in polluted conditions - Part 4: Insulators for d.c. systems (English PDF)
污秽条件下使用的高压绝缘子的选择和尺寸确定 第4部分：直流系统用绝缘子
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 10, 2019
Implementation date
July 1, 2020
Scope
GB/T 26218.4-2019 is the English-translated version of 污秽条件下使用的高压绝缘子的选择和尺寸确定 第4部分：直流系统用绝缘子.
GB/T 26218.4-2019 is the Chinese standard "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions -- Part 4: Insulators for d.c. systems".
Its scope clause reads: This part of GB/T 26218 specifies the principles for the selection and size determination of high-voltage insulators used in DC systems under contaminated conditions, material, site pollution level determination, external insulation configuration, insulator outline parameter requirements, design verification.
This section applies to. - porcelain and glass insulators; - Composite insulator; - Hybrid insulators. Its clauses include terms and definitions, acronyms; principle; material; site pollution level determination; outer insulation configuration; insulator outline parameter requirements; design verification.
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Document preview — GB/T 26218.4-2019
National Standard of the People's Republic of China
- ICS
- 29.080.10
- Classification
- K 48
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions, acronyms
- 3.1 Terms and definitions
- 3.2 Abbreviations
- 4 Principle
- 4.1 General
- 4.2 Design Process
- 5 Material
- 6 Site pollution level determination
- 6.1 Input data
- 6.2 Site pollution level
- 6.3 Fouling characteristics
- 6.4 Direct AC Pollution Ratio
- 6.5 AC and DC Site Pollution Degree Relationship
- 7 Outer insulation configuration
- 7.1 Step
- 7.2 Amendments to ESDDdc
- 7.3 Amendments to U50
- 7.4 Adjusting the number of pieces or length
- 7.5 Insulation configuration
- 8 Insulator outline parameter requirements
- 8.1 Overview
- 8.2 Alternating Umbrella and Umbrella Extension
- 8.3 Umbrella spacing
- 8.4 Ratio of Umbrella Spacing to Umbrella Extension
- 8.5 shortest distance between umbrellas
- 8.6 Ratio of creep distance to clearance distance
- 8.7 Umbrella inclination
- 8.8 Creepage coefficient
- 9 Design Verification
- 9.1 General principles
- 9.2 Operating experience
- 9.3 Laboratory test
- Appendix A (Informative) Site Pollution Test of DC Lines and Converter Stations
- Appendix B (informative) Example of DC line and converter station insulation configuration
- Appendix C (Informative) Example Survey and Indication of Pollution of Insulators in Polluted Areas
- Appendix D (informative) Operating experience
Foreword
GB/T 26218 "Selection and sizing of high-voltage insulators used in dirty conditions" includes 4 parts.
--- Part 1. Definition, information and general principles;
--- Part 2. Porcelain and glass insulators for AC systems;
--- Part 3. Composite insulators for AC systems;
--- Part 4. Insulators for DC systems.
This part is Part 4 of GB/T 26218.
This section is drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This part of GB/T 26218 specifies the principles for the selection and size determination of high-voltage insulators used in DC systems under contaminated conditions, material, site pollution level determination, external insulation configuration, insulator outline parameter requirements, design verification. This section applies to.
- porcelain and glass insulators;
- Composite insulator;
- Hybrid insulators.
This section includes three aspects of the classification of pollution levels, the configuration of pollution external insulation and the requirements of umbrella parameters. The main contents are as follows.
- Fouling characteristics and site pollution;
- Insulator selection and external insulation configuration under different pollution levels (including the number of line insulators and the insulation length of station insulators and creepage distance);
- Requirements for insulator umbrella parameters.
This section does not cover insulator selection and size determination under special operating conditions such as ice, snow and heavy rain.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 2900.8 Insulators for electrical terms
GB/T 19077-2016 particle size analysis laser diffraction method
GB/T 22707-2008 Artificial pollution test for high-voltage insulators for DC systems
GB/T 24622-2009 Guidelines for measuring the wettability of insulator surfaces
GB/T 26218.1-2010 Selection and sizing of high-voltage insulators used in contaminated conditions. Part 1. Definitions and information And general principles
GB/T 26218.2-2010 Selection and sizing of high-voltage insulators used in contaminated conditions. Part 2. For AC systems Porcelain and glass insulators
GB/T 26218.3-2011 Selection and sizing of high-voltage insulators used in contaminated conditions. Part 3. For AC systems Composite insulator
DL/T 859-2015 Artificial pollution test for composite insulators for high-voltage AC systems
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2900.8Electrotechnical terminology -- Insulators
- GB/T 19077-2016Particle size analysis - Laser diffraction methods
- GB/T 22707-2008Artificial pollution tests on high-voltage insulators to be used on d.c. systems
- GB/T 24622-2009Guidance on the measurement of hydrophobicity of insulator surfaces
- GB/T 26218.1-2010Selection and dimensioning of high-voltage insulators intended for use in polluted conditions -- Part 1: Definitions, information and general principles
- GB/T 26218.2-2010Selection and dimensioning of high-voltage insulators intended for use in polluted conditions -- Part 2: Ceramic and glass insulators for a.c. systems
Cited by
- GB/T 311.11-2025Insulation co-ordination - Part 11: Definitions, principles and rules for HVDC system
- GB/T 20840.14-2022Instrument transformers - Part 14: Additional requirements for current transformers for DC applications
- GB/T 20840.15-2022Instrument transformers - Part 15: Additional requirements for voltage transformers for DC applications
- GB/T 25308-2022DC filters for high voltage direct current transmission systems
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Related Standards
DL/T 859-2015 — Artificial pollution tests on composite insulators used on high-voltage AC systems
GB/T 22707-2008 — Artificial pollution tests on high-voltage insulators to be used on d.c. systems
GB/T 26218.1-2010 — Selection and dimensioning of high-voltage insulators intended for use in polluted conditions -- Part 1: Definitions, information and general principles
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GB/T 26218.4-2019
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