GB/T 31840.2-2025Aluminium alloy power cables with extruded insulation for rated voltages from 1 kV up to 35 kV — Part 2: Cables for rated voltages from 6 kV up to 30 kV (English PDF)

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 2 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 31840.2-2015 "Aluminum Alloys with Rated Voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV)".

Core-extruded insulated power cables, Part 2: Cables with rated voltages from 6kV (Um=7.2kV) to 30kV (Um=36kV).

Compared with GB/T 31840.2-2015, apart 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 version);

— The overlap requirement for metal shielding has been changed (see 10.2.2.3, 2015 version of 10.2.3);

— Added stainless steel wire (non-magnetic) and stainless steel strip (non-magnetic) materials to metal armor (see 10.4.2);

— Painted steel strip material has been removed (see 12.2 in the 2015 edition);

— The thickness requirements for non-metallic sheaths have been changed (see 11.3, 13.3 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);

— Added measurement requirements for the wrapping overlap rate, wrapping gap rate, and total thickness of the wrapping inner lining and/or wrapping padding layer (see 12.3.12, 12.3.13);

— 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 18.25 in the 2015 edition);

— The connection performance test for aluminum alloy conductors and fittings has been modified (see 12.5.29, 18.28 in the 2015 version);

— Inspection rules for products have been added (see Chapter 13);

— Added product labeling 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 G of the 2015 edition).

This document was proposed and is under the jurisdiction of the China Electricity Council.

This document was drafted by: Anhui Xinyi Cable Co., Ltd., China Electric Power Research Institute Co., Ltd., and State Grid Beijing Electric Power Company.

State Grid Zhejiang Electric Power Research Institute, State Grid Jiangsu Electric Power Research Institute, Jiangsu Hengtong Electric Power Cable Co., Ltd., Aerospace Electric Group Co., Ltd., Hangzhou Cable Co., Ltd., Zhejiang Chenguang Cable Co., Ltd., Wenzhou Aneng Technology Co., Ltd.

Technology Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., Jiangsu Changfeng Cable Co., Ltd., Jiangsu Tongguang Qiangneng Transmission Line Technology Co., Ltd., Zhejiang Chint Cable Co., Ltd., Jiangsu Zhongchao Cable Co., Ltd., Anhui Pacific Cable Co., Ltd., Mingda Cable Group Co., Ltd.

Shuangdeng Cable Co., Ltd., and Jinbei Electric Hengyang Cable Co., Ltd.

The main drafters of this document are: Deng Xianbo, Lin Zemin, Ouyang Benhong, Wang Yuli, Zhao Jiankang, Li Huachun, Cao Junping, Chen Jie, and Liu Songhua.

Zhao Peng, Wang Ge, Liu Wei, Zhao Shilin, Teng Zhaofeng, Yue Zhenguo, Zhong Pengjiao, Ma Zhuang, Zhang Gaoyang, Wang Shaogang, Tao Ruixiang, Sun Shuguang, Xue Juxin Gao Qingsong, Lü Zhiliang, and Hu Shaozhong.

The release history of this document and the document it replaces is as follows.

— First published in 2015 as GB/T 31840.2-2015;

— 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...

Cables are gradually being used. This type of cable uses aluminum alloy as the conductor, and its conductivity is comparable to that of aluminum core conductors, 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. China 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 China 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 test 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 change in understanding, technical parameters and the use of raw materials, revisions are necessary.

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 extruded insulation Power cables, Part 2: Rated voltage 6kV (Um=7.2kV) to 30kV (Um=36kV) cable

1 Scope

This document specifies the specifications for aluminum alloy core extruded insulated power cables with rated voltages from 6kV (Um=7.2kV) to 30kV (Um=36kV).

Voltage markings and materials, product naming, conductors, insulation, shielding, cable core, inner lining and filler, metal layer, outer sheath, inspection rules, markings, The labeling and accompanying documentation, packaging, transportation and storage requirements describe the corresponding test methods.

This document applies to fixed installations in power distribution networks or industrial facilities with rated voltages from 6kV (Um=7.2kV) to 30kV (Um= 36kV aluminum alloy core extruded insulated power cable.

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

GB/T 2951.11-2008

GB/T 2951.12-2008

GB/T 2951.13-2008

GB/T 2951.14-2008

GB/T 2951.21-2008

GB/T 2951.31-2008

GB/T 2951.32-2008

GB/T 2951.41-2008

GB/T 3048.4

GB/T 3048.10