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GB/T 31840.3-2025: Aluminum alloys power cables with extruded insulation for rated voltages from 1 kV(Um=1.2 kV) up to 35 kV(Um=40.5 kV) - Part 3: Cables for rated voltages 35 kV(Um=40 kV)
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GB/T 31840.3-2025	English	999	Add to Cart	7 days [Need to translate]	Aluminum alloys power cables with extruded insulation for rated voltages from 1 kV(Um=1.2 kV) up to 35 kV(Um=40.5 kV) - Part 3: Cables for rated voltages 35 kV(Um=40 kV)
GB/T 31840.3-2015	English	889	Add to Cart	7 days [Need to translate]	Aluminum alloys power cables with extruded insulation for rated voltages from 1 kV (Um=1.2 kV) up to 35 kV (Um=40.5 kV) -- Part 3: Cables for rated voltage of 35 kV (Um=40.5 kV)

GB/T 31840.3-2025: Aluminum alloys power cables with extruded insulation for rated voltages from 1 kV(Um=1.2 kV) up to 35 kV(Um=40.5 kV) - Part 3: Cables for rated voltages 35 kV(Um=40 kV)

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ICS 29.060.20 CCSK13 National Standards of the People's Republic of China Replaces GB/T 31840.3-2015 Rated voltage from 1kV (Um=1.2kV) to 35kV (Um=40.5kV) Aluminum alloy core extrusion Insulated power cables - Part 3.Rated voltage 35kV (Um=40.5kV) cable Released on October 5, 2025; to be implemented on February 1, 2026. State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III Introduction V 1.Scope 1 2 Normative References 1 3 Terms and Definitions 4.Voltage markings and materials 3 5.Product Naming 6.Conductor 7. 7.Insulation 8. 8.Shielding 9. 9.The cable core, inner lining, and filler of a three-core cable. 10 metal layers 10 11 Outer sheath 13 12 Testing and Judgment 14 13 Inspection Rule 33 14.Marks, labels, and accompanying documents 34 15 Packaging, transportation and storage 34 Appendix A (Normative) Assumptions for Calculating Sheath Dimensions 35 Appendix B (Normative) Numerical Rounding 39

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 GB/T 31840 "Aluminum Alloy Core Extruded Insulation with Rated Voltage of 1kV (Um=1.2kV) to 35kV (Um=40.5kV)". Part 3 of GB/T 31840, "Power Cables," has been published, including the following parts. ---Part 1.Cables with rated voltages of 1kV (Um=1.2kV) and 3kV (Um=3.6kV); ---Part 2.Cables with rated voltages from 6kV (Um=7.2kV) to 30kV (Um=36kV); ---Part 3.Cables with a rated voltage of 35kV (Um=40.5kV). This document replaces GB/T 31840.3-2015 "Aluminum Alloys with Rated Voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV)". "Core-Extruded Insulated Power Cables Part 3.Cables with Rated Voltage of 35kV (Um=40.5kV)" is consistent with GB/T 31840.3-2015. Compared to previous versions, aside from structural adjustments and editorial changes, the main technical changes are as follows. ---Thermoplastic polypropylene insulation material has been added (see 4.2); ---Added halogen-free flame-retardant sheath material ST8 (see 4.3); ---Product naming has been added (see Chapter 5); ---The requirement for conductor structure type has been removed (see 5.2 in the.2015 edition); ---The technical requirements for the overlap ratio of metal shielding tape have been revised (see 10.2.2.2,.2015 version of 10.2.2); ---The technical requirements for the thickness of non-metallic sheaths have been revised (see 11.3, 13.3 in the.2015 edition); ---Painted steel strip material has been removed (see 12.2 in the.2015 edition); ---Added DC withstand voltage test requirements for the outer sheath during factory testing (when the outer sheath has a semi-conductive structure) (see 12.2.5); ---The measurement requirements for wrapping overlap rate and gap rate have been added (see 12.3.12); ---The requirements for bundled flame retardant testing have been revised (see 12.5.15.2, 18.14 in the.2015 edition); ---A creep test method for aluminum alloy conductors has been added (see 12.5.27); ---The requirement for compressive creep testing of single aluminum alloy wires has been removed (see 18.26 in the.2015 edition); ---The test requirements for the connection performance of aluminum alloy conductors and fittings have been revised (see 12.5.28, 18.27 in the.2015 version); ---Inspection rules for products have been added (see Chapter 13); ---Added product markings, labels, and accompanying documentation (see Chapter 14); ---Added product packaging, transportation, and storage (see Chapter 15); ---The requirement for supplementary clauses for aluminum alloy core cable products has been removed (see Chapter 20 and Appendix E of the.2015 edition). This document was proposed and is under the jurisdiction of the China Electricity Council. This document was drafted by. China Electric Power Research Institute Co., Ltd., State Grid Beijing Electric Power Company, and State Grid Zhejiang Electric Power Company. Electric Power Research Institute, State Grid Jiangsu Electric Power Research Institute, Jiangsu Hengtong Electric Cable Co., Ltd., Zhejiang Chenguang Optoelectronics Cable Co., Ltd., Hangzhou Cable Co., Ltd., Aerospace Electric Engineering Group Co., Ltd., Wenzhou Aneng Technology Co., Ltd., Wuxi Jiangnan Electric Cable Co., Ltd., Jiangsu Changfeng Cable Co., Ltd., Jiangsu Tongguang Qiangneng Transmission Line Technology Co., Ltd., Zhejiang Chint Cable Co., Ltd., Anhui Xinyi Cable Co., Ltd., Mingda Cable Group Co., Ltd., Jiangsu Zhongchao Cable Co., Ltd., Jinbei Electric Hengyang Cable Co., Ltd., Anhui Pacific Cable Co., Ltd., Shuangdeng Cable Co., Ltd. The main drafters of this document are. Ouyang Benhong, Wang Yuli, Deng Xianbo, Zhao Jiankang, Li Huachun, Cao Junping, Chen Jie, Zhang Wei, and Liu Songhua. Liu Zongxi, Huang Kaiwen, Liu Wei, Yue Zhenguo, Teng Zhaofeng, Zhao Shilin, Zhong Pengjiao, Ma Zhuang, Zhang Gaoyang, Wang Shaogang, Shen Jialong, Lin Zemin, Gao Qingsong Sun Shuguang, Hu Shaozhong, Xue Juxin, and Lü Zhiliang. The release history of this document and the document it replaces is as follows. ---First published in.2015 as GB/T 31840.3-2015; ---This is the first revision.

Introduction

In recent years, the contradiction between the rapid development of the power grid and the relative scarcity of copper resources has become increasingly prominent. Relying solely on copper core cables will significantly increase the distribution costs. Power grid construction costs. To implement the national strategic goal of "saving copper with aluminum" and optimize the life-cycle cost of the distribution network, aluminum alloy core power supplies... This type of cable is gradually being used. It uses aluminum alloy as the conductor, and its conductivity is comparable to that of an aluminum core conductor, but its mechanical properties and resistance are different. The creep performance is significantly improved, avoiding the problems of poor ductility and unstable connection that exist in aluminum core cables; at the same time, compared with copper core cables, aluminum alloy... Gold-core cables offer significant economic advantages. my country is a country rich in aluminum but poor in copper; therefore, in certain applications and while ensuring cable product quality, [this advantage is crucial]. The development and application of aluminum alloy core cables can solve resource problems, reduce power grid construction costs, and promote the sustainable development of the power grid. GB/T 31840 "Aluminum Alloy Core Extruded Insulated Power Cables with Rated Voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV)" refers to... The standards for the design, production, and testing of aluminum alloy cables in my country are proposed to consist of three parts. ---Part 1.Cables with rated voltages of 1kV (Um=1.2kV) and 3kV (Um=3.6kV). The purpose is to specify the rated voltage. Structure, dimensions, and testing of 1kV (Um=1.2kV) and 3kV (Um=3.6kV) aluminum alloy core extruded insulated power cables Require. ---Part 2.Cables with rated voltages from 6kV (Um=7.2kV) to 30kV (Um=36). The purpose is to specify the rated voltage. Structure, dimensions and testing requirements for 6kV (Um=7.2kV) to 30kV (Um=36) aluminum alloy core extruded insulated power cables. ---Part 3.Cables with a rated voltage of 35kV (Um=40.5kV). The purpose is to specify the rated voltage of cables with a rated voltage of 35kV (Um= Structure, dimensions and test requirements for 40.5kV aluminum alloy core extruded insulated power cables. Aluminum alloy core power cable technology was introduced to China in.2007.After more than ten years of research, its manufacturing technology and application level have made significant progress. Improvements have been made since the first edition of GB/T 31840 was released in.2015, providing a basis for the manufacturing, inspection, and application of aluminum alloy core power cables in China. It has provided crucial support. After nearly ten years of application, the industry has gained a deeper understanding of the performance and testing requirements for aluminum alloy core power cables. With the understanding of the technology, the technical parameters and the use of raw materials have also changed accordingly, so it is necessary to revise them. The issuing organization of this document draws your attention to the fact that a declaration of compliance with this document may involve patents related to the aluminum alloy conductor composition in section 6.1. use. The issuing organization of this document makes no position on the authenticity, validity, or scope of the patent. The patent holder has committed to the issuing authority of this document that he is willing to allow any applicant to exercise their rights under reasonable and non-discriminatory terms and conditions. Negotiations are underway regarding patent licensing. The patent holder's statement has been filed with the issuing organization of this document. Further information can be obtained through the following contact information. Method of obtaining. Patent holder. Anhui Xinyi Cable Co., Ltd. Address. No. 98 Zhangwa Road, Hefei City, Anhui Province. Please note that in addition to the patents mentioned above, some content in this document may still involve patents. The issuing organization of this document does not assume responsibility for identifying patents. responsibility. Rated voltage from 1kV (Um=1.2kV) to 35kV (Um=40.5kV) Aluminum alloy core extrusion Insulated power cables - Part 3.Rated voltage 35kV (Um=40.5kV) cable

1 Scope

This document specifies the voltage markings and materials for 35kV (Um=40.5kV) aluminum alloy core extruded insulated power cables. Product naming, conductor, insulation, shielding, cable core, inner lining and filler, metal layer, outer sheath, inspection rules, markings, labels and accompanying documents, packaging The requirements for loading, transportation, and storage are described, along with the corresponding test methods. This document applies to aluminum alloy core extruded insulated power cables with a rated voltage of 35kV (Um=40.5kV) for fixed installation. This document does not apply to cables under special installation and operating conditions, such as overhead cables, mining industry cables, and nuclear power plants (within containment and surrounding areas). (Near) and underwater or ship cables.

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. GB/T 2951.11-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 11.General Test Methods Methods --- Thickness and Dimensional Measurement --- Mechanical Property Testing GB/T 2951.12-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 12.General Test Methods Method---Thermal Aging Test GB/T 2951.13-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 13.General Test Methods Methods for determining density. water absorption test, shrinkage test. GB/T 2951.14-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 14.General Test Methods Method---Low Temperature Test GB/T 2951.21-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 21.Elastomer Compounds Test methods. ozone resistance test, heat stretching test, mineral oil immersion test. GB/T 2951.31-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 31.Polyvinyl Chloride Blends Specialized test methods---High temperature pressure test---Crack resistance test GB/T 2951.32-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 32.Polyvinyl Chloride Blends Specialized test methods --- weight loss test --- thermal stability test GB/T 2951.41-2008 General Test Methods for Insulation and Sheath Materials of Cables and Optical Fibers - Part 41.Polyethylene and Polypropylene Special test methods for mixtures. environmental stress cracking test, melt index measurement method, direct combustion method for measuring carbon black and... (or) Thermogravimetric analysis (TGA) to measure carbon black content; microscopic assessment of carbon black dispersion in polyethylene. GB/T 3048.4 Electrical Performance Test Methods for Wires and Cables - Part 4.DC Resistance Test of Conductors GB/T 3048.10 Electrical Performance Test Methods for Wires and Cables - Part 10.Spark Test for Extruded Sheaths ...