GB/T 7251.2-2023 PDF English
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Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies
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GB/T 7251.2-2023: Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT7251.2-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.130.20
CCS K 31
GB/T 7251.2-2023 / IEC 61439-2.2020
Replacing GB/T 7251.12-2013
Low-Voltage Switchgear and Controlgear Assemblies
– Part 2.Power Switchgear and Controlgear Assemblies
(IEC 61439-2.2020, IDT)
Issued on. AUGUST 6, 2023
Implemented on. MARCH 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 7
1 Scope... 8
2 Normative References... 9
3 Terms and Definitions... 10
4 Symbols and Abbreviations... 13
5 Interface Characteristics... 13
6 Information... 15
7 Service Conditions... 15
8 Constructional Requirements... 15
9 Performance Requirements... 20
10 Design Verification... 20
11 Routine Verification... 25
Annexes... 28
Annex AA (Informative) Items Subject to Agreement between the PSC-Assembly
Manufacturer and the User... 29
Annex BB (Informative) Forms of Internal Separation (see 8.101)... 33
Annex CC (Informative) Determining Power Loss by Measurement for Circuits
Exceeding 1600 A in a Reference Design... 39
Annex DD (Informative) Assemblies for Use in Photovoltaic Installations... 41
Annex EE (Informative) Items Subject to Agreement between the Photovoltaic
Assembly (PVA) Manufacturer and the User... 52
Annex FF (Informative) Design Verification (PVA Only)... 56
Annex GG (Informative) List of Notes Concerning Certain Countries... 58
Bibliography... 59
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 2 of GB/T 7251 Low-Voltage Switchgear and Controlgear Assemblies.
GB/T 7251 has published the following parts.
--- Part 1.General rules;
--- Part 2.Power switchgear and controlgear assemblies;
--- Part 3.Distribution boards intended to be operated by ordinary persons (DBO);
--- Part 4.Particular requirements for assemblies for construction sites (ACS);
--- Part 5.Particular requirements for assemblies for power distribution in public networks;
--- Part 6.Busbar trunking systems (busways);
--- Part 7.Assemblies for specific applications such as marinas, camping sites, market
squares, electric vehicles charging stations;
--- Part 8.General technical requirements for intelligent assembly;
--- Part 10.Guidance to specifying assemblies.
This Document replaced GB/T 7251.12-2013 Low-Voltage Switchgear and Controlgear
Assemblies - Part 2.Power Switchgear and Controlgear Assemblies. Compared with GB/T
7251.12-2013, the technical changes of this Document are as follows besides the structural
adjustments and editorial modifications.
--- Add requirements for photovoltaic installation assemblies (see Annexes DD, EE and FF
of this Edition);
--- Change the requirements for the internal isolation form. When the isolation form is
greater than 1, when the functional unit is turned off, the protection level of all still
running components between the functional units shall be at least IPXXB (see 8.101 of
this Edition; 8.101 of 2013 Edition);
--- Add the verification method in the verification and evaluation method of temperature rise
(i) Verify the temperature rise of assemblies with natural cooling and circuits with rated
currents above 1600A through comparison with reference designs and calculations; (ii)
Verify the temperature rise for assemblies with active cooling and rated current not
exceeding 1600A. (See 10.10.4.101, 10.10.4.102 of this Edition);
--- Add definitions of terms related to active cooling (see 3.4.101 of this Edition);
--- Change the requirements for the protection level (IP code) of PSC-assemblies; and add
requirements related to active cooling (see 10.3 of this Edition; 10.3 of the 2013 Edition).
This Document equivalently adopted IEC 61439-2.2020 Low-Voltage Switchgear and
Controlgear Assemblies – Part 2.Power Switchgear and Controlgear Assemblies.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China Electrical Equipment Industry Association.
This Document shall be under the jurisdiction of National Technical Committee on Low-
Voltage Switchgear and Controlgear Assemblies of Standardization Administration of China
(SAC/TC 266).
Drafting organizations of this Document. Tianjin Research Institute of Electric Science Co.,
Ltd.; Tianjin Tianchuan Electric Control Equipment Test Co., Ltd.; Zhejiang Testing &
Inspection Institute for Mechanical and Electrical Products Quality; Tianjin Tianchuan Electric
Control and Distribution Co., Ltd.; Shandong Haiguan Electrical Co., Ltd.; Zhejiang Chint
Electrics Co., Ltd.; Vertiv Tech Co., Ltd.; Schneider Electric (China) Shanghai Branch;
Guangdong Guangte Electric Co., Ltd.; Xiangjiang Technology Co., Ltd.; Guizhou Changtong
Electrical Co., Ltd.; Changde Tianma Electrical Co., Ltd.; Qingdao TGOOD Electric Co., Ltd.;
Shenglong Electric Group Co., Ltd.; China Electric Power Research Institute, Wuhan Branch;
Guangxi Liudian Electric Co., Ltd.; Shanghai Nankong Communication Electrical Equipment
Co., Ltd.; Hangzhou Xinmei Complete Electric Appliances Manufacturing Co., Ltd.; Cooper
(Ningbo) Electric Co., Ltd.; Shanghai UPUN Electric Group Co., Ltd.; China Electric Power
Research Institute; SLC Shanghai Branch; Zhebao Electric (Hangzhou) Group Co., Ltd.;
Shanghai Huajian Switch Co., Ltd.; Wecome Intelligent Manufacturing Co., Ltd.; Sunfly
Intelligent Technology Co., Ltd.; Hunan Electric Research Institute Testing Group Co., Ltd.;
Shanghai Zhezhong Electric Co., Ltd.; Daqo Group Co., Ltd.; Hangzhou Zhijiang Switch Co.,
Ltd.; HONG Electrical Group Co., Ltd.; Chuan Kai Electric Co., Ltd.; TILVA Certification
Technology (Shanghai) Co., Ltd.; Guangdong Zhujiang Switchgear Co., Ltd.; Schneider (Xi'an)
Innovation Technology Co., Ltd.; Siemens Factory Automation Engineering Ltd.; Jiangsu
Wetown Electrical Co., Ltd.; Changshu Switchgear Mfg. Co., Ltd. (Former Changshu
Switchgear Plant); ZhongJian Quality Test & Certification Research Institute Co., Ltd.; State
Grid Shanghai Energy Internet Research Institute Co., Ltd.; Plateau (Shandong) Mechanical
and Electrical Equipment Co., Ltd.; Shanghai Outong Electric Co., Ltd.; Shandong Wanhai
Electric Technology Co., Ltd.; Tai’an City Country-Specific Ones Electric Co., Ltd.; Tianjin
Tianchuan Yingke Technology Development Co., Ltd.; Fujian Yuneng Electric Power
Equipment Co., Ltd.; Shandong Houyu Industrial Co., Ltd.; Changsha ATA Automation Co.,
Ltd.; Beijing Ludian Electric Equipment Co., Ltd.; Shenzhen Guanghui Electric Apparatus
Industrial Co., Ltd.; Beijing Hezong Technology Co., Ltd.; Guangdong Keyuan Electric Co.,
Ltd.; Zhuhai Yingyuan Electric Co., Ltd.; Guangdong Zhongxing Electrical Switch Co., Ltd.;
Junlang Electric Co., Ltd.; Jiangsu Nanrui Telstar Electrical Co., Ltd.; Dahang Youneng
Electrical Co., Ltd.; People Electric Appliance Group (Shanghai) Co., Ltd.; Zhejiang CRL
Electric Apparatus Co., Ltd.; Guangdong Bailin Electrical Equipment Factory Co., Ltd.; Dalian
Huarui Heavy Industry Group Co., Ltd., Electronic Control Equipment Factory; Zhongtian
Electrical Technology Co., Ltd.; Dongying Jinfeng Zhengyang Technology Development Co.,
Ltd.; Shandong Wansheng Electric Co., Ltd.; Tianjin Top Electric Co., Ltd.; Zhenjiang
Gardermoen Intelligent Power Technology Co., Ltd.; Jiangsu Yineng Electric Co., Ltd.;
Shandong Shengli Tonghai Group Dongying Tianlan Energy Saving Technology Co., Ltd.;
Jiangsu Huaqiang Electric Equipment Co., Ltd.; Beijing HCRT Electrical Equipment Co., Ltd.;
Dongying Hande Automation Integration Co., Ltd.; Hangzhou Electric Power Equipment
Manufacturing Co., Ltd., Yuhang Qunli Complete Electric Manufacturing Branch; Shengli Oil
Field Shengli Electric Co., Ltd.; Shandong Hengdong Industrial Group Co., Ltd.; Shengli
Oilfield Huabin Welfare Mechanical and Electrical Co., Ltd.; Tianjin Product Quality
Inspection Technology Research Institute Electrical Engineering Technology Research Center;
Fujian Senda Electric Co., Ltd.; Guangdong Ziguang Electrical Co., Ltd.; YIFA Holding Group
Co., Ltd.; Hager Electric Management (Shanghai) Ltd.; Hangzhou AOKE Optical Electronic
Equipment Co., Ltd.; Shandong Luneng Liyuan Electric Equipment Co., Ltd.; Shenzhen
Renergy Electric Equipment Co., Ltd.; Shanghai Dahua Electrical Equipment Co., Ltd.;
Shenzhen China Electronics Technology Industrial Co., Ltd.; Zhengzhou Tide Technology Co.,
Ltd.; Fujian Samsung Electric Co., Ltd.; Shenzhen Huacheng Electric Power Equipment Co.,
Ltd.; Bona Certification Co., Ltd.; Kechang Electrical Co., Ltd.; Yantai Sanshui Electric Co.,
Ltd.; Xuchang Yushengchang Electric Co., Ltd.; Ningxia Kaichen Electric Group Co., Ltd.;
Yangzhou Deyun Electric Equipment Co., Ltd.; Yucheng Electric Apparatus Co., Ltd.; Kerun
Intelligent Control Co., Ltd.; Yiwu Power Transmission and Transformation Engineering Co.,
Ltd. Bafang Electric Branch; Tianjin JTH Electrical Equipment Co., Ltd.; Henan Real Electric
Limited Company; Leipeng Electric Group Co., Ltd.; Shanghai Baolin Electric Group Co., Ltd.;
Xinxiang Wanxin Electric Co., Ltd.; Henan Sanhe Electric Group Co., Ltd.; Jiangsu Guokong
Power Equipment Co., Ltd.; Henan VAVO Electric Co., Ltd.; Zhejiang Jiangshan Yuanguang
Electric Co., Ltd.; Bofang Electric Co., Ltd.; Shenzhen Huatong Electrical Equipment Co., Ltd.;
Guangdong Shunde Switch Factory Co., Ltd.; Hangzhou Decheng Electric Power Technology
Co., Ltd.; Hangzhou Electric Power Equipment Manufacturing Co., Ltd. Fuyang Rongda
Complete Electrical Manufacturing Branch; Ningbo Xinsheng Medium Voltage Electric
Appliances Co., Ltd.; Shandong Ruike Electric Co., Ltd.; Ti Certification (Shanghai) Co., Ltd.;
Yantai EUNON Electronic Technology Co., Ltd.; Zhuhai Watt Power Equipment Co., Ltd.;
Naning Hexing Grid Technologies Co., Ltd.; Guangdong Zhengchao Electric Co., Ltd.;
Shenzhen Ouyate Electrical Equipment Co., Ltd.; Boshida Group Co., Ltd.; and Nanjing
Dashoubi Electronic Technology Co., Ltd.
Chief drafting staffs of this Document. Liu Jie, Lu Lin, Ma Lin, Wang Yang, Dong Haiming,
Li Xing, Fang Mingdong, Chen Wei, Guo Weikun, Zang Xuefeng, Zhang Yi, Nie Jiabin, Sun
Fupeng, Xie Zhengxin, Jin Jianwei, Zhou Zhiyong, Gao Guangchun, Wang Pengcheng, Hu
Biao, Wang Guoliang, Zhang Penghe, Huang Qin, Jiang Xiaodong, Tu Yuanlong, Cai Hengcai,
Yu Xiangyong, Xu Yan, Zhu Yanhui, Yang Quanbing, Zhuang Yaoding, Chen Weiwei, Liu
Shixu, Cui Tao, Zhang Bocheng, Zhang Qinghong, Dai Lijun, Yang Yimin, Hu Jiangang, Lou
Yingchao, Han Shaigen, Yang Dongliang, Xiang Zhangfeng, Li Yugang, Yin Yigang, Hou Liang,
Jin Ting, Hu Chenguang, Jiang Ting, Wen Yingchun, He Mo, Ying Qin, Liang Shijiang, Zeng
Xunhui, Wu Qilin, Zhang Junge, Dai Yongzheng, Yao Jiuming, Zhang Jianxin, Wang Li, Huang
Songjie, Liang Shumin, Ji Hongzhi, Fu Ruijun, Shan Hao, Zhao Yi, Wang Lin, Wang Kuan, Liu
Xianglong, Ma Yuqing, Yan Xiuzhang, Zhang Aizhen, Shao Yechen, Liu Jun, Cui Jianguo, Li
Feng, Lv Zhiguo, Chen Zeyin, Zeng Jinghe, Kong Li, Du Jialin, Jin Hui, Liu Dang, Xu Anmei,
Wei Gaocong, Gao Jun, Guo Xiaolei, Wang Shengmo, Zhang Jiangzhou, Deng Chao, Wei
Zheng, Liu Tianlong, Li Weixia, Zhu Jianhua, Zhu Maojun, Bai Shuhong, Liu Jianhua, Ye
Haolin, Wang Tao, Yun Yongxian, Zhong Xinguo, Ma Zhiqiang, Wang Yuandong, Sheng Yunjie,
Zhang Xiaofeng, peng Dong, Mao Feng, Li Xingchao, Wu Xianli, Qiao Zhenquan, Ma Qinghua,
Zhao Zhixin, Zhang Xibo, Zhao Hui, Zhu Jia, Chi Xuejiao, Zheng Yongqiang, Qi Guanghua,
Wu Houfeng, Liu Defang, Xu Ruguang, and Gao Hualin.
The historical editions replaced by this Document are as follows.
--- GB 7251.12-2013 was first-time published in 2013; and the No. was adjusted into GB/T
7251.12-2016 in 2016;
--- It is the first-time revised hereby; and the No. is adjusted into GB/T 7251.2-2023.
1 Scope
This Document defines the specific requirements for the power switchgear and controlgear
assembly (abbreviated ‘PSC-assembly’ throughout this Document see 3.1.101) as follows.
--- assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;
--- assemblies designed for a nominal frequency of the incoming supply or supplies not
exceeding 1 000 Hz;
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
Clause 2 of GB/T 7251.1-2023 is applicable in addition to the following.
Addition.
GB/T 5226.1-2019 Electrical safety of machinery—Electrical equipment of machines -
Part 1.General requirements (IEC 60204-1.2016, IDT)
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 7251.1-2023 and
the following apply.
Electric circuit intended to supply directly electric current to current using equipment or socket
outlets.
Clearance between open contacts of withdrawable parts meeting the safety requirements
specified for disconnectors.
4 Symbols and Abbreviations
Clause 4 of GB/T 7251.1-2023 is applicable.
5 Interface Characteristics
Clause 5 of GB/T 7251.1-2023 is applicable, except as follows.
In the absence of an agreement between the assembly manufacturer and the user concerning the
actual load currents, the assumed loading of the outgoing circuits of the assembly or group of
outgoing circuits may be based on the values in Table 101.
For a motor or electric actuator circuit, the assumed load current is the rated current of the motor
multiplied with the loading factor of Table 101.If only the rated voltage and rated power of the
motor is provided, then the rated current of the motor can be taken from IEC 60947-4-1.2018,
Annex G.
6 Information
Clause 6 of GB/T 7251.1-2023 is applicable, except as follows. Replacement of the title and item g).
A PSC-assembly that can be energized from more than one source shall carry a warning label
indicating that the assembly is energized from more than one source, and that parts inside the
assembly can still be live unless all supplies are isolated.
7 Service Conditions
Clause 7 of GB/T 7251.1-2023 is applicable.
8 Constructional Requirements
Clause 8 of GB/T 7251.1-2023 is applicable, except as follows.
Where a degree of protection (IK code) provided by a PSC-assembly enclosure against
mechanical impact is declared by the original manufacturer, this shall be verified in accordance
with 10.2.6.
9 Performance Requirements
Clause 9 of GB/T 7251.1-2023 is applicable, except as follows.
NOTE 3.For guidance on performance of a PSC-assembly under condition of internal arc-faults, see
IEC TR 61439-0.For guidance on testing, see IEC TR 61641.For guidance on the integration of internal
arc-fault mitigation systems into PSC-assemblies, see IEC TS 63107.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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