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Similar standardsGB/T 11022-2020: Common specifications for high-voltage alternating-current switchgear and controlgear standards---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/GBT11022-2020 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.130.10 K 43 Replacing GB/T 11022-2011 Common specifications for high-voltage alternating-current switchgear and controlgear standards (IEC 62271-1.2017, High-voltage switchgear and controlgear - Part 1.Common specifications for alternating current switchgear and controlgear, MOD) Issued on. DECEMBER 14, 2020 Implemented on. JULY 01, 2021 Issued by. State Administration for Market Regulation; Standardization Administration of the PRC. Table of ContentsForeword... 5 1 Scope... 13 2 Normative references... 13 3 Terms and definitions... 17 4 Normal and special service conditions... 34 4.1 Normal service conditions... 34 4.2 Special service conditions... 36 5 Ratings... 38 5.1 General... 38 5.2 Rated voltage (Ur)... 39 5.3 Rated insulation level (Ud, Up, Us)... 39 5.4 Rated frequency (fr)... 42 5.5 Rated continuous current (Ir)... 42 5.6 Rated short-time withstand current (Ik)... 43 5.7 Rated peak withstand current (Ip)... 43 5.8 Rated duration of short-circuit (tk)... 44 5.9 Rated supply voltage of auxiliary and control circuits (Ua)... 44 5.10 Rated frequency of supply voltage of auxiliary and control circuits... 44 5.11 Rated pressure of compressed gas supply for controlled pressure systems... 44 5.12 Rated charging pressure/level for insulation and/or switching... 45 6 Design and construction... 45 6.1 Requirements for liquids in switchgear and controlgear... 45 6.2 Requirements for gases in switchgear and controlgear... 45 6.3 Earthing of switchgear and controlgear... 45 6.4 Auxiliary and control equipment and circuits... 46 6.5 Dependent power operation... 50 6.6 Stored energy operation... 50 6.7 Independent unlatched operation (independent manual or power operation)... 52 6.8 Manually operated actuators... 52 6.9 Operation of releases... 53 6.10 Pressure/level indication... 54 6.11 Nameplates... 54 6.12 Locking devices... 56 6.13 Position indication... 57 6.14 Degrees of protection provided by enclosures... 57 6.15 Creepage distances for outdoor insulators... 58 6.16 Gas and vacuum tightness... 58 6.17 Tightness for liquid... 59 6.18 Fire hazard (flammability)... 60 6.19 Electromagnetic compatibility (EMC)... 60 6.20 X-ray emission... 60 6.21 Corrosion... 60 6.22 Filling pressure/levels for insulation and/or switching and operation... 61 7 Type tests... 61 7.1 General... 61 7.2 Dielectric tests... 63 7.3 Radio interference voltage (RIV) test... 73 7.4 Resistance measurement of circuits... 73 7.5 Continuous current tests... 75 7.6 Short-time withstand current and peak withstand current tests... 83 7.7 Verification of the degree of protection... 86 7.8 Tightness tests... 87 7.9 Electromagnetic compatibility tests (EMC)... 90 7.10 Additional tests on auxiliary and control circuits... 96 7.11 X-radiation test for vacuum interrupters... 99 8 Routine tests... 102 8.1 General... 102 8.2 Dielectric test on the main circuit... 102 8.3 Tests on auxiliary and control circuits... 103 8.4 Measurement of the resistance of the main circuit... 104 8.5 Tightness test... 104 8.6 Design and visual checks... 105 9 Guide to the selection of switchgear and controlgear... 105 9.1 General... 105 9.2 Selection of rated values... 106 9.3 Cable-interface considerations... 106 9.4 Continuous and temporary overload due to changed service conditions... 106 9.5 Environmental aspects... 106 10 Information to be given with enquiries, tenders and orders... 107 10.1 General... 107 10.2 Information with enquiries and orders... 108 10.3 Information with tenders... 109 11 Transport, storage, installation, operating and maintenance instructions... 110 11.1 General... 110 11.2 Conditions during transport, storage and installation... 110 11.3 Installation... 111 11.4 Operation... 114 11.5 Maintenance... 114 12 Safety... 120 12.1 General... 120 12.2 Precautions by manufacturers... 120 12.3 Precautions by users... 121 13 Influence of the product on the environment... 122 Annex A (Informative) Pollution level and minimum nominal unified specific creepage distance of external insulation of switchgear... 123 Annex B (Informative) References for auxiliary and control circuit components... 125 Annex C (Informative) List of symbols... 127 Annex D (Normative) Method for the weatherproofing test for outdoor switchgear and controlgear... 128 Annex E (Normative) Tolerances on test quantities during tests... 131 Annex F (Informative) Extension of validity of type tests... 134 Annex G (Normative) Identification of test objects... 136 Annex H (Normative) Determination of the equivalent RMS value of a short-time withstand current during a short-circuit of a given duration... 139 Annex I (Informative) Information and technical requirements to be given with enquiries, tenders and orders... 141 Annex J (Informative) Electromagnetic compatibility site measurements... 144 Bibliography... 146ForewordThis Standard is drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces GB/T 11022-2011 "Common specifications for high-voltage switchgear and controlgear standards". Compared with GB/T 11022-2011, the main technical changes are as follows. - Revise the previous Clause 1 "Overview" to Clause 1 "Scope" and Clause 2 "Normative references"; revise the "Scope" (see Clause 1 and Clause 2; Clause 1 of the 2011 edition); - Add the terms "Internal insulation", "Site pollution severity (SPS) class", "Highest voltage for equipment", "Supply voltage (of auxiliary and control circuits)" and "Thermal time constant" (see Clause 3); - Adjust "Normal and special service conditions" to Clause 4 (see Clause 4; Clause 2 of the 2011 edition); - Revise the ambient air temperature range in "Normal service conditions" (see 4.1; 2.2 of the 2011 edition); - Delete the previous Figure 1 "Altitude correction factor" and the calculation formula (see 2.3.2 of the 2011 edition); - Add pollution requirements and ambient air temperature range for indoor applications under "Special service conditions" (see 4.2.3 and 4.2.4); - Revise the wind speed requirements of "Special service conditions"; delete the requirements for ice coating (see 4.2.6; 2.3.6 and 2.3.7 of the 2011 edition); - Add the description of ratings (see 5.1); - Add the rated voltage class and rated insulation level applicable to the switchgear of alternator system; add the calculation method of additional voltage in the column (3) and column (5) in Table 1 (see 5.2 and 5.3); - Modify the insulation level of rated voltage range II (see 5.3; 4.3 of the 2011 edition); - Change the previous "Rated current" to "Rated continuous current" (see 5.5; 4.5 of the 2011 edition); - Add the peak factor of rated peak withstand current at different time constants and rated frequencies (see 5.7); - Add the rated short-circuit duration of 1 s; delete the previous requirements for 4 s (see 5.8; 4.8 of the 2011 edition); - Revise the "closing and opening devices and auxiliary and control circuits" in the previous subclause title TO "auxiliary and control circuits"; revise the corresponding content (see 5.9 and 5.10; 4.9 and 4.10 of the 2011 edition); - Delete the previous requirements for "tolerance", "ripple voltage", "voltage dip and interruption" in rated voltage (see 4.9.3, 4.9.4, and 4.9.5 of the 2011 edition); - Delete the requirement that the diameter of fastening screws and bolts shall not be less than 12 mm in "Earthing of switchgear and controlgear" (see 5.3 of the 2011 edition); - Add the normal operation of electrical circuits (see 6.4.1); - Delete the previous requirements for the enclosure of "Auxiliary and control equipment" (see 5.4.2 of the 2011 edition); - Revise the requirements for "Protection against electric shock" (see 6.4.2; 5.4.3 of the 2011 edition); - Delete the content of "Fire hazard" (5.4.4 of the 2011 edition); - Add the requirements for "Manually operated actuators" (see 6.8); - Revise the previous "Low- and high-pressure interlocking and monitoring devices" TO "Pressure/level indication" and revise the requirements (see 6.10; 5.9 of the 2011 edition); - Revise the "Nameplates" requirements; add Table 9 (see 6.11; 5.10 of the 2011 edition); - Delete the content of the protection class of "Protection against mechanical impact on equipment under normal service conditions (IK coding)" (Table 7 of 5.13.4 of the 2011 edition); - Modify the requirements for the maximum permissible values of relative leakage rate of "Closed pressure systems for gas" (see 6.16.3; 5.15.3 of the 2011 edition); - Delete the tightness requirements for liquid controllable pressure systems and liquid closed pressure systems (see 5.16.2 and 5.16.3 of the 2011 edition); - Add "Filling pressure/levels for insulation and/or switching and operation" (see 6.22); - Delete the relevant type test requirements for transfer and off-site production [see 6.1.1b) of the 2011 edition]; - Delete the requirements for grouping and quantity of test objects for type tests (see 6.1.2 of the 2011 edition); - Add the requirement that "The type test report for performance verification shall be used together with the original type test report" [see 7.1.1c)]; - Add the requirements of a statement that the test object complies with the drawings submitted and of the location, laboratory name where the tests were conducted and date of test in “Information to be included in type-test reports” (see 7.1.3; 6.1.4 of the 2011 edition); - Revise the test criteria of 7.2.5b) (see 6.2.5 of the 2011 edition); - Add the requirements for the polarity of test voltage treatment; add the description of the symbols used in Tables 10 to 13 (see 7.2.6 and the notes in Tables 10 to 13); - Modify the voltage value applied to the terminals on both sides in the preferred method (see 7.2.7.2; 6.2.7.2 of the 2011 edition); - Revise the requirements for the distribution of test voltage for insulation between poles in switching impulse voltage tests (see 7.2.8.3; 6.2.8.3 of the 2011 edition); - Modify the applicable scope of radio interference voltage test (see 7.3; 6.3 of the 2011 edition); - Add the electrical continuity of earthed metallic parts test AND the resistance measurement of contacts and connections in the main circuit as a condition check (see 7.4.3 and 7.4.4); - Change the previous "Temperature-rise tests" to "Continuous current tests"; incorporate the previous "Temperature rise" content (see 7.5; 4.5.2 and 6.5 of the 2011 edition); - Revise the rated current value of switchgear and controlgear for which "the tests may be made with the three poles connected in series" in the continuous current test (see 7.5.2; 6.5.2 of the 2011 edition); - Introduce "OG" (oxidizing gas) and "NOG" (not oxidizing gas) to replace the previous "air" and "SF6" respectively (see Table 14 of 7.5.5.1; Table 3 in 4.5.2 of the 2011 edition); - Revise the temperature rise/temperature limits of parts in Tables 1, 2, and 4 (see Table 14 of 7.5.5.1; Table 3 in 4.5.2 of the 2011 edition); - Add accessible surface categories and their corresponding permissible temperature rise/temperature limits (see Table 14 of 7.5.5.1); - Add the standard ambient air temperature value during tightness tests; give the acceptable ambient air temperature range during the test (see 7.8.1.1; 6.8.1 of the 2011 edition); - Delete the requirement to record the curve of the radio interference level against the applied voltage (6.9.1 of the 2011 edition); - Revise the test voltage (common mode/differential mode) of damped oscillatory wave immunity test (see 7.9.2.3; 6.9.2.4 of the 2011 edition); - Delete the steady-state damp heat test in the additional tests of auxiliary and control circuits (see 6.10.5.4 of the 2011 edition); - Add the test criteria for the X-radiation test of vacuum interrupter (see 7.11.3); - Delete the informative Annex E, Annex H, and Annex I of the previous edition; - Add a new "Annex A (informative)"; - Add a new "Annex F (informative)". This Standard uses the redraft law to modify and adopt IEC 62271-1.2017 "High- voltage switchgear and controlgear - Part 1.Common specifications for alternating current switchgear and controlgear". Compared with IEC 62271-1.2017, this Standard has structural changes. The annex numbers are adjusted according to the order in which they are mentioned in the main text. The technical differences between this Standard and IEC 62271-1.2017 and their reasons are as follows. - As for the normative references, this Standard has made adjustments with technical differences, to adapt to the technical conditions of China. The adjustments are mainly reflected in Clause 2 “Normative references”. The specific adjustments are as follows. Replace IEC 60038.2009 with GB/T 156-2017 which modifies and adopts the international standard; Replace IEC 60071-1.2006 with GB/T 311.1-2012 which modifies and adopts the international standard; Replace IEC 60071-2.1996 with GB/T 311.2-2013 which modifies and adopts the international standard; Replace IEC 60296 with GB 2536 which modifies and adopts the international standard; Replace IEC 60050(441).1984 with GB/T 2900.20-2016 which modifies and adopts the international standard; Replace IEC 60270 with GB/T 7354 which modifies and adopts the international standard; Replace IEC 60480 with GB/T 8905 which modifies and adopts the international standard; Replace IEC/TR CISPR 18-2 with GB/T 11604 which modifies and adopts the international standard; Replace IEC 60060-1.2010 with GB/T 16927.1-2011 which modifies and adopts the international standard; Replace IEC/TS 60815-1.2008 with GB/T 26218.1-2010 which modifies and adopts the international standard; Replace IEC/TS 60815-2.2008 with GB/T 26218.2-2010 which modifies and adopts the international standard; Replace IEC/TS 60815-3.2008 with GB/T 26218.3-2011 which modifies and adopts the international standard; Delete IEC 60050-131.2002, IEC 60050-151.2001, IEC 60050-192.2015, IEC 60050-351, IEC 60050-441.1984, IEC 60050-551, IEC 60050-581.2008, IEC 60050-601, IEC 60050-605, IEC 60050-614.2016, IEC 60050-811, IEC 60050-826.2004, IEC 60068-2-1.2007, IEC 60068-2-2.2007, IEC 60068-2- 30.2005, IEC 60376, IEC 61000-6-5, IEC 62271-4; Add references to GB/T 762, GB/T 2423 (all parts), GB/T 4025, GB/T 4728.1, GB/T 4796.1, GB/T 4797 (all parts), GB/T 4798 (all parts), GB/T 5169 (all parts), GB/T 5465.2, GB/T 6113 (all parts), GB/T 11023, GB/T 12022, GB/T 13540, GB/T 17627, GB/T 25840, GB/T 28534, GB/T 28537, GB/T 28811, GB/T 34662. - Modify the applicable voltage range and applicable frequency range, to meet the actual situation of China's power grid (see Clause 1). - Delete 3.4.1 and 3.4.2; revise 3.4 to "3.4 Switching devices. There are no specific definitions". Because it has been defined in GB/T 2900.20, it will not be repeated here. - Modify the rated voltage values of range I and range II, to meet the actual situation of China's power grid (see 5.2). - Add the rated voltage of generator system switchgear and its rated insulation level, to meet the needs of generator system switchgear (see 5.2 and 5.3). - Modify the rated insulation level of range I and range II, to meet the requirements of insulation coordination in China (see 5.3). - Add the calculation method of additional voltage in column (3) and column (5) of Table 1 (see 5.3). - Delete Table 2 and Table 4 of IEC 62271-1.2017; because they have nothing to do with China's voltage. - Add the DC time constants of 133 ms and 150 ms; give the corresponding peak factor, to meet the needs of switchgear of the generator system (see 5.7). - Modify the preferred value of rated short-circuit duration, to meet the actual needs of China's power grid (see 5.8). - Add the requirement that "When the supply voltage is less than or equal to 30 % of the rated supply voltage, it shall not trip", to meet the actual situation in China (see 6.9). - Modify the lower limit of supply voltage from "70 % (DC)" to "65 % (DC)", to meet the actual situation in China (see 6.9.3). - Add the requirements for type test period, to meet the specific reality of China (see 7.1.1). - Modify the value of voltage applied to the terminals on both sides in the preferred method of 7.2.7.2, to ensure the uniformity of test voltage. - Modify the requirements for the distribution of test voltage for insulation between poles in 7.2.8.3, to ensure the consistency of the test. - Modify the condition check test voltage requirements of 7.2.12 and add Note 2, to conform to the specific reality of China. - Modify the ambient temperature during tightness tests, to harmonize with the relevant standards in China (see 7.8.1.1). - Delete informative Annex I in IEC 62271-1.2017; because it has nothing to do with Chinese standards. This Standard has made the following editorial change. - In order to be consistent with the existing standard series, change the standard name to "Common specifications for high-voltage alternating-current switchgear and controlgear standards". Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights. This Standard was proposed by China Electrical Equipment Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 65 on High-voltage Switchgear of Standardization Administration of China (SAC/TC 65). Drafting organizations of this Standard. Xi'an High Voltage Apparatus Research Institute Co., Ltd.; China Electric Power Research Institute Co., Ltd.; Guangdong Zhengchao Electric Co., Ltd.; Shanghai Decom Power Equipment Co., Ltd.; Shanghai Electric Power Transmission & Distribution Testing Centre Co., Ltd.; New Northeast Electric Group High Voltage Switchgear Co., Ltd.; State Grid Anhui Electric Power Company Research Institute; ABB High Voltage Switchgear (Xiamen) Co., Ltd.; ABB (China) Co., Ltd.; Cooper (Ningbo) Electric Co., Ltd.; Liaoning High Voltage Apparatus Quality Test Co., Ltd.; Shandong Taikai Vacuum Switch Co., Ltd.; Xiamen Huadian Switchgear Co., Ltd.; Xi'an XD High Voltage Apparatus Co., Ltd.; Shandong Taikai Apparatus Complete Co., Ltd.; Xi’an XD Switchgear Electric Co., Ltd.; XD Baoji Electric Co., Ltd.; Schneider Electric (China) Co., Ltd.; State Grid Shaanxi Electric Power Company Research Institute; Yunnan Power Grid Co., Ltd. Electric Power Research Institute; State Grid Zhejiang Electric Power Company Shaoxing Power Supply Company; State Grid Hebei Electric Power Company Research Institute; Qingdao TGOOD Electric Co., Ltd.; Pinggao Group Co., Ltd.; Xi’an Jiaotong University; Xiamen University of Technology; Henan Senyuan Electric Co., Ltd.; Siemens Medium Voltage Switchgear Technology (Wuxi) Co., Ltd.; Qingdao Marine Electrical Equipment Inspection & Testing Co., Ltd.; State Grid Electric Power Research Institute Testing and Certification Technology Co., Ltd.; China Southern Power Grid Co., Ltd. EHV Transmission Company Maintenance Test Center; Beijing Creative Distribution Automation Co., Ltd.; Tianshui Changcheng Switchgear Co., Ltd.; TBEA Zhongfa Shanghai High Voltage Switchgear Co., Ltd.; Jiangsu Huaguan Electric Appliance Group Co., Ltd.; Jiangsu Rugao High Voltage Electric Apparatus Co., Ltd.; Schneider (Shaanxi) Baoguang Electrical Apparatus Co., Ltd.; Hunan Changgao High Voltage Switchgear Co., Ltd.; Xiamen XEC Electric Co., Ltd.; Shanghai Sieyuan High Voltage Switchgear Co., Ltd.; Beijing Beikai Electric Co., Ltd.; Huayi Electric Co., Ltd.; Shandong Taikai Disconnector Co., Ltd.; Tai'an Taishan High-voltage Switchgear Co., Ltd.; Chuan Kai Electric Co., Ltd.; Schneider Electric (Xiamen) Switchgear Equipment Co., Ltd.; Eaton Electrical Ltd.; Eaton Electrical Equipment Co., Ltd.; Henan Pingzhi High Voltage Switchgear Co., Ltd.; Changzhou Pacific Electric Power Equipment (Group) Co., Ltd.; Shenzhen Qihui Electric Co., Ltd.; Yihe Electric Group Co., Ltd.; Xiamen GOOD EP Electrical Co., Ltd.; Shanghai Siemens Switch Co., Ltd.; Shanghai Pinggao Tianling Switchgear Co., Ltd.; Shaanxi Shanrui Electric Co., Ltd.; Shitong Electric Branch of Zhejiang Bada Electronic Instruments Co., Ltd.; Jiangsu NARI Power Electric Co., Ltd.; Ningbo Shunli High Voltage Switch Technology Co., Ltd.; Sendall (China) Electric Co., Ltd.; Sichuan Huayi Elec. Apparatus Co., Ltd.; Sanxia Electromechanical Engineering Technology Co., Ltd.; Shenzhen Electric Research Institute; Gansu Electrical Apparatus Research Institute; Ningxia Licheng Electric Group Co., Ltd.; Jiangsu NARI Turbo Star Electric Co., Ltd.; TBEA Automatic Control Equipment Corporation; Jiangsu Daqo High Voltage Switchgear Co., Ltd.; Henan Huasheng Longyuan Electric Co., Ltd.; XD Group Shaanxi Baoguang Group Co., Ltd.; Suzhou Electrical Apparatus Science Research Institute Co., Ltd.; TÜV Rheinland (Shanghai) Co., Ltd.; Fujian Senda Electric Co., Ltd.; Jiang Dong Fittings Equipment Co., Ltd. Main drafters of this Standard. Feng Wujun, Tian Enwen, Yuan Fuxing, Feng Ying, Jiang Ziyuan, Zhang Zhenqian, Tan Yan, Kong Xiangjun, Chen Yanliang, Huang Hui, Bian Xin, Cui Hongjian, Yang Wei, Gao Erping, Chen Tiansong, Chen Dajin, Xie Jianbo, Huang Liqun, Liu Chengxue, Shen Zhongwei, Li Ling, Zhao Jingbo, Qin Chengwei, Zhang Xinglang, Wang Chuanchuan, Lu Quanfeng, Zheng Weixia, Yang Weiwei, Yan Shitao, Cui Mingshuo, Li Zhenjun, Kou Zhengli, Lei Xiaoqiang, Yang Ren, Peng Jing, Li Dian, Xing Na, Zhang Zixiao, Zhang Shi, Pan Jin, Cao Weizheng, Wang Xiangke, Zhong Jianying, Liu Zhiyuan, Li Fuyong, Geng Yingsan, You Yimin, Yao Sili, Sun Mei, Zhang Jinbo, Liu Yang, Xue Zhong, Zhang Haifeng, Jiang Junchao, Li Peng, Zhang Changhong, Wang Yan, Yu Qingrui, Chang Yue, Zhang Xiangao, Wang Chengquan, Zhang Bofeng, Deng Wenhua, Feng Jianxing, Yuan Zhibing, Qiao Zhong, Jiao Zhenjiang, Yan Wenqu, Lin Fantian, Wu Keyan, Liu Bing, Ji Guanghui, Wu Bingchang, Song Baochun, Chen Hongfei, Wang Lahong, Liu Gang, Wang Zhen, Yuan Chunping, Lu Yian, Kong Xiangchong, Chen Bo, Ouyang Kejin, Wang Junzhuang, Wu Jiangang, Li Liuling, Ye Shuxin, Lv Daqing, Yao Huailin, Hu Guangfu, Feng Ziyou, Yang Jianfa, Gai Fei, Xiao Minying, Li Ping, Jin Junye, Dai Yongzheng, Wang Cunfu, Wang Hua, Gao Jie, Zhou Xiaolin, Zhang Chongle, Zhao Ruihao, Chen Zeyin, Yue Sanxiang, Hao Yuliang, Wang Peiren, Shen Yin, Yang Zhongzhou. The previous editions of the standards replaced by this Standard were released as follows. - GB 2706-1989; - GB 763-1990; - GB 11022-1989, GB/T 11022-1999, GB/T 11022-2011. Common specifications for high-voltage alternating-current switchgear and controlgear standards1 ScopeThis Standard specifies the terms and definitions, service conditions, ratings, design and construction, type tests, and routine tests requirements of high-voltage alternating- current switchgear and controlgear.2 Normative referencesThe following documents are indispensable for the application of this document. For the dated references, only the editions with the dates indicated are applicable to this document. For the undated references, the latest edition (including all the amendments) are applicable to this document. GB/T 156-2017 Standard voltages (IEC 60038.2009, MOD) GB/T 311.1-2012 Insulation co-ordination - Part 1.Definitions, principles and rules (IEC 60071-1.2006, MOD)3 Terms and definitionsThe terms and definitions defined in GB/T 2900.20-2016 and the following ones apply to this document.4 Normal and special service conditionsWhen high-voltage switchgear and controlgear is expected to be used under conditions different from the normal service conditions given in 4.1, the user's requirements should refer to standardized steps in 4.2.2 up to 4.2.7 if not provided by product standards.5 RatingsThe rated voltage (Ur), as used in this Standard, is the phase-to-phase RMS voltage equal to the maximum system voltage for which the equipment is designed. It indicates the maximum value of the "highest system voltage" of networks for which the equipment may be used (see 3.7.3, highest voltage for equipment Um). The rated voltages are given in 5.2.2 and 5.2.3 below. The rated supply voltage should be selected from the standard values given in Table 6 and Table 7.6 Design and constructionSwitchgear and controlgear shall be provided with a reliable earthing point for connection of an earthing conductor suitable for specified fault conditions. The connecting point shall be marked with the "protective earth" symbol, as indicated by symbol in GB/T 5465.2.7 Type testsDielectric tests shall be performed in compliance with GB/T 16927.1-2011, unless otherwise specified in this Standard. When a wet test is required, the standard wet test procedure given in GB/T 16927.1- 2011 shall be followed.8 Routine testsA dry, short-duration power-frequency voltage test shall be applied. The test procedure shall be according to GB/T 16927.1-2011 and to 7.2, except that each pole or transport unit shall be tested. For closed pressure systems of gas, the test shall be carried out at or above the minimum functional pressure (density) for insulation. 9 Guide to the selection of switchgear and controlgear For the normal service conditions present in 4.1.2 e), condensation may occasionally occur on, or in, indoor switchgear and controlgear. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 11022-2020 be delivered?Answer: The full copy PDF of English version of GB/T 11022-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 11022-2020_English with my colleagues?Answer: Yes. 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Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 11022-2020 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 11022-2020?A step-by-step guide to download PDF of GB/T 11022-2020_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 11022-2020". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". 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