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NB/T 33018-2015Technical specifications of EV charging and battery swap infrastructure power supply system (English PDF)

电动汽车充换电设施供电系统技术规范

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Issued by

NEA

Level / Type

Industry · Recommended

Issue date

April 2, 2015

Implementation date

September 1, 2015

Scope

NB/T 33018-2015 is the English-translated version of 电动汽车充换电设施供电系统技术规范.

NB/T 33018-2015 sets the technical rules for the power supply systems that feed electric vehicle charging stations and battery swap stations in China. It deals with construction principles, supply arrangements, power quality, energy metering, supply monitoring, safety requirements and marking.

Among its provisions are the choice between 10 kV (20 kV) and low-voltage supply depending on whether distribution capacity reaches 100 kVA, radial feeders for chargers and battery swap equipment, transformer sizing with Dyn11 windings and no oil-immersed units indoors, the busbar arrangement on the 10 kV side and a TN-S earthing system on the 0.38 kV side.

Designers and builders of charging and swap stations are its intended users, and centralized AC charging piles may follow it by reference. Issued on 2 April 2015, it has applied since 1 September 2015.

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Document preview — NB/T 33018-2015

National Standard of the People's Republic of China

Issued by: National Energy Administration of the People's Republic of China

Foreword3
1 Scope4
2 Normative references4
3 Terms and definitions5
4 Construction principles5
5 Power-supply requirements5
6 Electric energy quality7
7 Electric energy metering7
8 Power-supply monitoring7
9 Safety requirements7
10 Marks8

1 Scope

This Standard specifies the Construction principles, power requirements, power quality, energy metering, power supply monitoring, safety requirements and identification for EV charging and battery swap infrastructure power supply system.

This Standard is applicable to the design and construction of power-supply system of electric vehicle charging station and battery swap station. Centralized AC charging piles can be implemented with reference to this Standard.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB 13955, Installation and operation of residual current operated protective devices

GB/T 29316, Power quality requirements for electric vehicle charging/battery swap infrastructure

GB/T 29317, Terminology of electric vehicle charging/battery swap infrastructure

GB 50052, Code for Design Electric Power Supply Systems

GB 50053, Code for Design of 20kV & Under Electric Substation

GB/T 50065, Code for Earthing Design of AC Electrical Installations

GB 50229, Code for design of fire protection for fossil fuel power plants and substations

DL/T 448, Technical administrative code of electric energy metering

DL/T 620, Guide Rule for Wildfire Risk Forecasting Technique in Overhead

a) when the distribution capacity is greater than or equal to 100kVA, it is recommended to use 10kV (20kV) power supply mode, and the power supply directly meets N-1 requirements;

b) when the power distribution capacity is less than 100kVA, the low-voltage power supply mode is adopted.

5 Power-supply requirements

5.2.2 Radiated power supply shall be used for chargers, battery box swap equipment, monitoring systems, and other important electrical equipment.

5.3 Selection of transformer

5.3.1 When two transformers are installed, the capacity of each transformer is not directly less than 70% of the total load of the charging station/battery swap station.

5.3.2 Transformers installed indoors shall not be oil-immersed transformers.

5.3.3 Distribution transformer windings shall use Dyn11 connection.

5.4 Electrical design

5.4.1 The design of the power distribution room shall meet the requirements of GB 50053.

5.4.2 The wiring method of the 10kV side busbar of the power supply system shall adopt single busbar or single busbar segmentation wiring.

5.4.3 Charging and battery swap equipment shall not share the same 0.38kV outlet with other equipment in the station.

5.4.4 10kV side entry switch shall use circuit breaker or load switch. When using a circuit breaker, it shall configure the microcomputer protection.

5.4.5 The system with 10kV dual power supply can be configured with automatic backup power supply and shall have blocking function.

5.5 Grounding method

5.5.1 The setting of the grounding device of the power-supply system shall meet the requirements of GB/T 50065.

5.5.2 0.38kV side grounding form shall use TN-S.

5.5.3 Electrical equipment in the charging station/battery swap station shall be reliably grounded. […]

5.6 Equipment layout

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Normative references

GB 13955 · DL/T 620

Similar standards

GB/T 29316-2012|NB/T 11652-2024|NB/T 33009-2021|NB/T 33019-2021|NB/T 33004-2020|GB/T 29317-2021

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