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GB/T 45418-2025Technical requirements for AC distribution networks of 10 kV and below (English PDF)

配电网通用技术导则

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

February 28, 2025

Implementation date

June 1, 2025

Scope

GB/T 45418-2025 is the English-translated version of 配电网通用技术导则.

China's national technical requirements for AC distribution networks at 10 kV and below. This is the part of the power system the customer actually connects to, and it is where the transition now bites hardest.

A distribution network was designed to carry power one way, from the substation outward, with loads that were diverse and predictable.

It now hosts rooftop photovoltaic that reverses the flow at midday, electric vehicle charging that concentrates load in the evening, heat pumps, and storage that does both - and China is adding all of them faster than anywhere else.

The consequence is that planning rules, protection settings, voltage management and the equipment itself all need revisiting together, which is what a comprehensive technical standard can do and a series of amendments cannot.

It covers planning, network structure and equipment, construction and refurbishment, operation and maintenance, customer supply connection and the secondary systems, and may be referenced for 20 kV networks.

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Document preview — GB/T 45418-2025

National Standard of the People's Republic of China

ICS: 29.240.01
Classification: F 21

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

ForewordIII
1 Scope1
2 Normative references1
3 Terms and Definitions2
4 Basic Regulations4
5 Planning4
5.1 General requirements4
5.2 Power supply area division and planning period5
5.3 Electricity supply and demand forecast5
5.4 Distribution network power supply safety criteria6
5.5 Short-circuit current level and neutral point grounding method6
6 Grid structure and equipment6
6.1 General requirements6
6.2 10kV distribution network framework7
6.3 10kV overhead line8
6.4 10kV cable line8
6.5 10kV overhead line equipment8
6.6 10kV station room equipment9
6.7 220V/380V distribution network9
7 Construction and renovation10
7.1 General requirements10
7.2 Overhead lines10
7.3 Cables and channels11
7.4 Switching station, ring network room and distribution room11
7.5 10kV Neutral Point Grounding Method Modification11
8 Operation and maintenance12
8.1 General requirements12
8.2 Inspection and maintenance12
8.3 Inspection and emergency repair12
8.4 Operation Analysis13
9 User and power access13
9.1 General requirements13
9.2 User Access13
9.3 Distributed power supply and energy storage device access14
9.4 Access to charging and swapping facilities14
10 Secondary System15
10.1 General requirements15
10.2 Relay protection15
10.3 Distribution Automation16
10.4 Electric Energy Harvesting16
10.5 Power Distribution Communication16
Appendix A (Informative) Schematic diagram of typical 10kV overhead network structure17
A.1 Radial17
A.2 Multi-segment single contact17
A.3 Multi-segment Moderation17
Appendix B (Informative) Schematic diagram of typical grid structure of 10kV cable network18
B.1 Single ring18
B.2 Double shot18
B.3 Opposite beam18
B.4 Double ring type18
B.5 N supply one spare (2<=N<=4)19
Appendix C (Informative) 220V/380V distribution network structure diagram20
Reference21

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 for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the China Electricity Council.

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

Co., Ltd., State Grid Shanghai Electric Power Company, Guangdong Power Grid Co., Ltd. Guangzhou Power Supply Bureau, State Grid Zhejiang Electric Power Co., Ltd. Jiaxing Power Supply

Power Company, State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute, State Grid Nanjing Control System Co., Ltd., Gansu Dentsu Electric Power Engineering Co., Ltd.

Cheng Design Consulting Co., Ltd., China Southern Power Grid Research Institute Co., Ltd., State Grid Jibei Electric Power Co., Ltd. Qinhuangdao Power Supply Company,

Beijing Huisi Huineng Technology Co., Ltd.

The main drafters of this document are: Li Hongtao, Hou Yiming, Ning Xin, Gui Yuan, Liu Wei, Xu Chang, Liao Tianming, Cai Yueming, Wang Jianzhong, Sun Jian, Pang Mingyuan,

Lu Qi, Ji Kunhua, Yu Haiping, Yang Qiaoyin, Yuan Yubo, Mao Zhiyu, Hou Shichang, Cui Lizhong, Hao Liang.

General technical guidelines for distribution networks

1 Scope

This document specifies the planning, grid structure and equipment, construction and transformation, operation and maintenance, users and

Technical requirements for power supply access, secondary system, etc.

This document is applicable to the planning, construction, transformation and operation and maintenance of 10kV and below AC distribution networks, and can be used as a reference for 20kV distribution networks.

2 Normative references

The contents of the following documents constitute essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 156 Standard Voltage

GB 3096 Acoustic Environment Quality Standard

GB/T 12325 Power quality supply voltage deviation

GB/T 13955 Installation and operation of residual current operated protective devices

GB/T 14285 Technical specification for relay protection and safety automatic devices GB.20052 Energy efficiency limit values and energy efficiency grades for power transformers

GB/T 29328 Technical specification for power supply and self-provided emergency power supply configuration for important power users

GB/T 33593 Technical requirements for grid-connected distributed power sources

GB/T 33982 Technical Specification for Grid-connected Relay Protection of Distributed Generation

GB/T 36278 Technical specification for connecting electric vehicle charging and swapping facilities to distribution networks

GB/T 36547 Technical regulations for the connection of electrochemical energy storage power stations to the power grid

GB/T 36572 Guidelines for network security protection of power monitoring systems

GB/T 43025 Technical Guidelines for Power Supply Schemes for User Access to the Grid

GB/T 43456 Electricity inspection specification

GB/T 43526 Technical regulations for the connection of user-side electrochemical energy storage systems to distribution networks

GB 50053 Design specification for substations 20kV and below

Remaining clauses in the full document

3 Terms and Definitions
4 Basic Regulations
5 Planning
6 Grid structure and equipment
7 Construction and renovation
8 Operation and maintenance
9 User and power access
10 Secondary System

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

GB 50053

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