GB/T 7251.5-2017 English PDFUS$679.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7251.5-2017: Low-voltage switchgear and controlgear assemblies -- Part 5: Assemblies for power distribution in public networks Status: Valid GB/T 7251.5: Historical versions
Basic dataStandard ID: GB/T 7251.5-2017 (GB/T7251.5-2017)Description (Translated English): Low-voltage switchgear and controlgear assemblies -- Part 5: Assemblies for power distribution in public networks Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K31 Classification of International Standard: 29.130.20 Word Count Estimation: 34,354 Date of Issue: 2017-07-31 Date of Implementation: 2018-02-01 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China GB/T 7251.5-2017: Low-voltage switchgear and controlgear assemblies -- Part 5: Assemblies for power distribution in public networks---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Low-voltage switchgear and controlgear assemblies--Part 5. Assemblies for power distribution in public networks ICS 29.130.20 K31 National Standards of People's Republic of China Replace GB/T 7251.5-2008 Low-voltage switchgear and control equipment Part 5. Utility grid power distribution equipment Part 5. Assembliesforpowerdistributioninpublicnetworks (IEC 61439-5.2014, IDT) Released on.2017-07-31 2018-02-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued ContentForeword III 1 Scope 1 2 Normative references 2 3 Terms and Definitions 2 4 symbols and abbreviations 3 5 Interface Features 3 6 Information 3 7 Conditions of use 4 8 Structural requirements 4 9 Performance requirements 6 10 Design Verification 6 11 routine inspection 16 Appendix 17 Reference 28ForewordGB/T 7251 "Low-voltage switchgear and control equipment" is planned to release the following parts. --- Part 0. Guidelines for specifying complete sets of equipment; --- Part 1. General; --- Part 2. Complete sets of power switches and control equipment; --- Part 3. Switchboards (DBO) operated by general personnel; --- Part 4. Special requirements for complete sets of equipment for construction sites (ACS); --- Part 5. Electrical power distribution equipment for public utilities; --- Part 6. Busbar trunking system (busbar trunking); --- Part 7. Complete sets of equipment for specific applications - such as terminals, campsites, market squares, electric vehicle charging stations. This part is the fifth part of GB/T 7251. This part should be used in conjunction with GB/T 7251.1-2013. Supplement and repair of its terms Change or replace the corresponding clauses in GB/T 7251.1-2013, the chapters of GB/T 7251.1-2013 are not mentioned in this section, then Applicable to this section. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 7251.5-2008 "Low-voltage switchgear and control equipment - Part 5. Power supply for public power grids The special requirements for electric complete sets of equipment, compared with GB/T 7251.5-2008, the main technical changes are as follows. --- Reference to the revised GB/T 7251 low-voltage switchgear and control equipment standards, and GB/T 7251.1-2013 applicable The content of the structure and technology is consistent; --- Corresponding introduction of new verification; --- Coordinated the requirements for substation cable distribution panels and cable distribution boxes, eliminating the need to identify two categories of equipment And definitions; --- Simplified the standard by reducing the number of defined plant types and identifying only the different sets of equipment by initials; --- Determined that the test performed on the most complex PENDA can be used to test if the general structure and rated data are the same. a complete set of equipment with the same or less complexity; --- Clarify the time/requirement for impact proof verification of PENDA (common power distribution equipment) in severe cold weather; --- Fixed the direction of the applied force in the static load test. This part uses the translation method equivalent to IEC 61439-5.2014 "Low-voltage switchgear and control equipment - Part 5. Utility Network power distribution equipment. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. --- GB/T 5169.16-2008 Electrical and electronic products - Fire hazard test - Part 16. Test flame 50W Straight flame test method (IEC 60695-11-10.2003, IDT) This section has made the following editorial changes. --- "This standard" was changed to "this part"; --- Replace the symbol "," with the decimal symbol "."; --- The newly added tables and diagrams in this section are numbered starting from 101; --- Remove the preface to international standards. This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Low Voltage Switchgear and Control Equipment Standardization Technical Committee (SAC/TC266). This section drafted by. Tianjin Electric Science Research Institute Co., Ltd., Tianjin Tianchuan Electric Control Distribution Co., Ltd., national electronic control power distribution equipment Quality Supervision and Inspection Center, China Quality Certification Center, Zhenjiang Product Quality Supervision and Inspection Center, Chuankai Electric Co., Ltd., Chengdu Branch Star Power Electric Co., Ltd., Daquan Group Co., Ltd., Tianjin Jiu'an Group Co., Ltd., Shanghai Electric Transmission and Distribution Group Co., Ltd., Shandong Lu Liyuan Electric Equipment Co., Ltd., Guangxi Liudian Electric Co., Ltd., Jilin Longding Electric Co., Ltd., Suzhou Aichi Motor Co., Ltd., Guangdong Zhengchao Electric Co., Ltd., Yiwu Bafang Power Equipment Manufacturing Co., Ltd., Hangzhou Electric Power Equipment Manufacturing Co., Ltd., Ning Xia Licheng Electric Group Co., Ltd., Shenzhen Guanghui Electric Industrial Co., Ltd., Zhejiang Qunli Electric Co., Ltd., Zhejiang Fangyuan Electric Equipment Testing Co., Ltd. The main drafters of this section. Wang Yang, Cui Jing, Liu Jie, Chen Yu, Cui Weifeng, Qiang Qiang, Luo Andong, Zhao Ming, Qi Jun, Shan Fuhe, Wang Chunling, Zhang Shaobao, Zhou Zhiyong, Li Yan, Li Xiaoming, Wu Hanzhen, Chen Yanliang, Ding Yudi, Jiang Yijun, Niu Guangjun, Huang Xiande, Hu Xiang, Huang Fang. The previous versions of the standards replaced by this section are. ---GB 7251.5-1998, GB/T 7251.5-2008. Low-voltage switchgear and control equipment Part 5. Utility grid power distribution equipment1 ScopeThis part of GB/T 7251 specifies the specific requirements for utility power distribution equipment (PENDA). PENDA meets the following requirements. --- For the electric energy distribution of the three-phase system whose rated voltage does not exceed 1000V AC (see the typical distribution network of Figure 101); ---Fixed; ---Open equipment is not included in this section; --- Suitable for installation in places where only professionals can use, outdoor type can be installed in places accessible to ordinary people; --- For indoor or outdoor use. This section is intended to define the definition of PENDA, specifying conditions of use, structural requirements, technical characteristics and testing. Grid parameters may be required Tested at higher performance levels. The PENDA can include control and/or signaling devices associated with power distribution. This section applies to all PENDAs that are designed, manufactured or fully standardized for mass production. Production and/or assembly may not be the initial manufacturer (see 3.10.1 of GB/T 7251.1-2013). This section does not apply to individual devices and self-contained components that comply with relevant product standards, such as motor starters, fuse switches, and electricity. Sub-devices, etc. This section does not apply to specific types of equipment covered by other parts of GB/T 7251. Figure 101 Typical Distribution Network Note 1. If PENDA is equipped with additional equipment (such as measuring instruments), this way obviously changes its main function, according to the agreement between the user and the manufacturer. Other standards are applied (see 8.5 of GB/T 7251.1-2013). Note 2. PENDA in accordance with this section can be used outside the utility grid if local regulations and actual conditions permit.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Chapter 2 of GB/T 7251.1-2013 is applicable except as follows. increase. GB/T 7251.1-2013 Low-voltage switchgear and control equipment - Part 1. General (IEC 61439-1.2011, IDT) IEC 60695-11-10.2013 Fire hazard test Part 11-10. Test flame 50W Horizontal and vertical flame test Method (Firehazardtesting-Part 11-10. Testflames-50Whorizontalandverticalflametestmethods) ISO 6506-1 - Brinell hardness test for metallic materials - Part 13 Terms and definitionsThe terms and definitions defined in GB/T 7251.1-2013 and the following terms and definitions apply to this document. 3.1 General terms Increase the terminology. 3.1.101 Utility grid distribution equipment publicelectricitynetworkdistributionASSEMBLY;PENDA Typically used in public utilities to receive power from one or more sources and distribute the energy through one or more cables Complete equipment to other equipment. Note 1. PENDA is only installed, operated and maintained by professionals. Note 2. Some forms of PENDA were previously considered to be cable distribution boxes (CDC). 3.1.101.1 Outdoor utility power distribution equipment outdoorpublicelectricitynetworkdistributionASSEMBLY;PENDA-O Suitable for cabinet-type utility grid power distribution equipment installed outdoors, publicly available or not accessible. 3.1.101.2 Indoor public utility power distribution equipment indoorpublicelectricitynetworkdistributionASSEMBLY;PENDA-I Applicable to public power distribution equipment installed indoors, generally without enclosure, but including all necessary equipment for complete equipment Structural components that support busbars, functional units, and other accessory devices. 3.3 Complete equipment shape design 3.3.1 Open type equipment open-typeASSEMBLY The terminology of GB/T 7251.1-2013 does not apply. 3.9 Verification modify. 3.9.1 Design verification designverification Remove the note. 3.9.1.2 Verify comparison verificationcomparison The terminology of GB/T 7251.1-2013 does not apply. 3.9.1.3 Verification assessment verificationassessment The terminology of GB/T 7251.1-2013 does not apply.4 symbols and abbreviationsChapter 4 of GB/T 7251.1-2013 is applicable.5 interface characteristicsChapter 5 of GB/T 7251.1-2013 is applicable except as follows. 5.4 Rated dispersion coefficient (RDF) increase. If the actual load current is missing from the package manufacturer's agreement with the user, the complete set of equipment outlet circuit or outlet circuit group The computational load can be based on the values given in Table 101. Table 101 Calculating the load value Calculate the load factor by the number of main circuits 2 and 3 circuits 0.9 4 and 5 circuits 0.8 6~9 circuits (including 9) 0.7 10 and above circuit 0.66 informationChapter 6 of GB/T 7251.1-2013 is applicable except as follows. 6.1 Flags specified in the complete set of equipment Increase to the first paragraph. If the nameplate is intended to be installed in the enclosure, it can be easily read and viewed when the door is opened or removed, and can be placed outside the kit. Inside the shell. Replace d). d) GB/T 7251.5-2013. 6.3 Identification of devices and/or components Increase the next paragraph. For replaceable fuses of a specific fuse type, markings shall be placed on the fuse and the fuse base to avoid carrier fuses. Misplaced replacement. Add a bar. 6.101 Circuit Identification Each functional unit should be clearly identifiable.7 Conditions of useChapter 7 of GB/T 7251.1-2013 is applicable except as follows. 7.1.1.2 Ambient air temperature of outdoor equipment Replace the last paragraph. Unless the user specifies that PENDA is suitable for cold weather, the lower limit of ambient air temperature is -25 °C. For a cold climate, week The lower limit of the ambient air temperature is -50 °C. 7.2 Special conditions of use h) add the following note. Note. Vibration due to vehicle traffic and/or ground excavation is a normal use condition for PENDA. Increase the next paragraph. Additional requirements for PENDA-O to be installed in areas where blizzards occur and in areas where snow removal is required to remove snow. Agreement between manufacturer and user (see Appendix BB).8 structural requirementsExcept for the following, Chapter 8 of GB/T 7251.1-2013 is applicable. 8.1 Strength of materials and components 8.1.1 General increase. PENDA-O shall be arranged for ground-mounted, transformer-mounted, on-column installation, wall mounting according to the agreement between the user and the manufacturer. Or embedded in the wall. PENDA can be directly connected to the transformer via flanges or connected to the cable via cable or bus according to the agreement between the user and the manufacturer. Source. The outgoing circuit should be suitable for cable connections. A reliable latching device should be provided on the outdoor enclosure to prevent unauthorized access. Doors, covers and panels shall be designed to be Locked, not opened due to moderate ground subsidence, or vibrations due to vehicle traffic and/or ground digging and rework. 8.1.3.2 Heat resistance and ignition resistance of insulating materials Add a bar. 8.1.3.2.101 Verifiability level verification Insulating materials for enclosures, baffles and other insulating components shall be flame retardant in accordance with 10.2.3.102 of this standard. 8.1.5 Mechanical strength Add a bar. 8.1.5.101 Mechanical strength verification The mechanical properties of PENDA-O should be in accordance with 10.2.101 of this part. PENDA-O components intended to be embedded in the ground shall withstand the stresses applied during installation and normal use and comply with 10.2.101.9 Provisions. Add a bar. 8.1.101 Thermal stability The thermal stability of PENDA shall be verified in accordance with 10.2.3.101. 8.2 Degree of protection of the enclosure of the complete equipment 8.2.1 Protection against mechanical collisions 8.2.1 of GB/T 7251.1-2013 does not apply. 8.2.2 Prevent access to live parts and the entry of external solids and water increase. Open kits (IP00) are not included in this section. The PENDA-O to be installed in a publicly accessible location, the degree of protection provided by the enclosure after it has been fully installed according to the manufacturer's instructions According to IEC 60529, it should be at least IP34D. In other locations, the degree of protection should be at least IP33. PENDA-O intended to be installed in publicly accessible locations, unless specifically stated by the user, should be designed to be connected to any temporary cable The degree of protection provided by the enclosure shall be at least IP23C in accordance with IEC 60529. See section 8.8. 8.4 Electric shock protection 8.4.2.1 General The third paragraph does not apply. Add a bar. 8.4.2.101 Grounding and shorting The outlet unit of the complete equipment shall be constructed so that it can be reliably grounded and shorted by the manufacturer's recommended equipment to ensure the All parts of the equipment maintain the degree of protection (IP code) specified by the manufacturer. If the system status and/or actual operation may cause danger This requirement does not apply when produced. 8.4.3.1 Installation conditions Increase the paragraph. For complete sets of equipment that need to be supplied to overhead cable lines, the outlet unit should be designed so that its connecting cable can be grounded at the terminal. 8.8 External wire terminal Replace the first three paragraphs with the following. If there is no specific agreement between the user and the manufacturer, the terminal should be suitable for use from the smallest to the largest with the rated current. Copper or aluminum conductor cable with cross-sectional area (see Table AA.1 in Appendix AA). The position of the outgoing circuit terminals shall be such as to provide sufficient spacing and to facilitate the cable phase conductors without considering the laying of the cable. connection. When required by the user, the incoming circuit should be suitable for connection with bare busbars or insulated busbars. For a note on the use of other countries, see Appendix DD. Add a bar. 8.101 Clearing snow barrier markers PENDA-O intended for use in areas where Blizzard occurs, according to 7.2 or alternative methods may be used, if required by the user, Sign of snow barriers. A clamp should be provided on the PENDA-O to secure the sign post and to be installed and adjusted from outside the PENDA The position of the pole. The construction of the clamp shall ensure that the mechanical force is transmitted to the PENDA-O enclosure to achieve the degree of protection (IP code) Before the value of the adverse effect, the clamp or the sign post is pushed away by the force. 8.102 Convenience in operation and maintenance From a practical point of view, all components of the plant should be easily accessible and replaceable without excessive disassembly. Component parts The conditions for the change can be based on the agreement between the user and the manufacturer. The kit should be designed so that the cable is easily connected from the front. If the PENDA does not have a built-in measuring facility, the portable unit should be able to measure the incoming unit easily and safely. There are voltages on the phased and outgoing units at all ends of the current-slowing device and/or the switching device. It is also possible to measure the power on one phase of all outgoing units. flow. During this operation, all live parts of the PENDA shall be adequately protected to ensure the degree of protection required by 8.2. manufacturer Instructions on the steps taken should be provided. If the plant is intended to be connected to a backup power source, such as a backup generator, the switch connection device shall be designed to comply with IEC 60529. The live part with protection class IP10 is connected. A locking device should be provided on the PENDA to enable the door to lock and prevent unauthorized access. Can be moved during installation or maintenance All fixtures of the panel, etc., should only be accessible when the door is open.9 Performance requirementsChapter 9 of GB/T 7251.1-2013 is applicable. 10 Design verification Chapter 10 of GB/T 7251.1-2013 is applicable except as follows. 10.1 General Replace paragraphs 4, 5 and 6 with the following. Design verification should only be carried out by applying tests that comply with Chapter 10 of this section. Validated by benchmarking design evaluations and comparisons The alternative method should not be used (see Table CC.1 in Appendix CC). Performing tests on the most rigorous PENDA, it is believed that it is possible to verify similar or less similar data with the same overall structure and rating Harsh plant performance. For example, performing a temperature rise test on a 800A PENDA-O with five outgoing circuits is considered to be Suitable for the same structure (same housing design, same bus design and same incoming unit) with PENDA-O for temperature rise test PENDA-O of 8 outgoing circuits with the same rated data. Add the last paragraph. Users need to specify more stringent or additional test requirements when they need to adapt to their specific grid parameters. 10.2 Strength of materials and components 10.2.2 Corrosion resistance 10.2.2.1 Test procedure Replace the last paragraph with the following. 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