GB/T 7674-2020Gas-insulated metal-enclosed switchgear for rated voltages of 72.5kV and above (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1:1-2009:

This standard replaces GB/T 7674-2008 "Gas insulated metal enclosed switchgear with rated voltage of 72:5kV and above", and

Compared with GB/T 7674-2008, the main technical changes are as follows:

---According to my country's environmental conditions, the relevant content of Table 101 has been modified (see 4:3, 2:2 of the:2008 edition);

---Modified the test voltage between the 126kV and 252kV fractures in Table 102 (see 5:3, 4:2 in the:2008 edition);

---The expansion joint and related technical requirements have been added (see 6:108);

---Added the observation window and related technical requirements (see 6:109);

---Modified the gas quality verification content in Chapter 10 installation (see 11:3:101:7, 10:2:101:6 in the:2008 edition);

---Added the content of appendix C operation continuity;

---Modified the content of the DC component in Appendix F Test Method under Internal Fault Arc Conditions (see F:2:2:3,:2008 edition

B:2:2:2):

This standard uses the redrafting method to modify and adopt IEC 62271-203:2011 "High-voltage switchgear and control equipment Part 203: amount

Gas-insulated metal-enclosed switchgear with constant voltage of 52kV and above":

Compared with IEC 62271-203:2011, this standard has many adjustments in structure: Appendix A lists this standard and IEC 62271-

203:2011 chapter number comparison list:

The technical differences between this standard and IEC 62271-203:2011 and the reasons are as follows:

--- Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments:

The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows:

* Replace IEC 60068-2-11 with GB/T 2423:17-2008 which is equivalent to adopting international standards;

* Replace IEC 62271-102:2001 with GB/T 1985-2014, which is modified to adopt international standards;

* Replace IEC 60137:2008 with GB/T 4109-2008 which is modified to adopt international standards;

* Replace IEC 60270 with GB/T 7354 which is modified to adopt international standards;

* Replace IEC 60480 with GB/T 8905 which is modified to adopt international standards;

* Replace IEC 60840 with GB/T 11017:1 modified to adopt international standards;

* Replace IEC 62067 with GB/T 22078:1 which is modified to adopt international standards;

* Replace IEC 62271-1:2007 with GB/T 11022-2011 which is modified to adopt international standards;

* Replace IEC 62271-209:2007 with GB/T 22381-2017 which is modified to adopt international standards;

* Replace IEC 62271-303 with GB/T 28537 which is modified to adopt international standards;

* Added references to GB/T 3785 (all parts), GB/T 9326 (all parts), GB/T 9789, GB/T 11023,

GB/T 12022, GB/T 13540, GB/T 16927:1, GB/T 21429, GB/T 22382-2017, GB/T 23752,

GB/T 26218 (all parts), GB/T 28819;

* Deleted IEC 60044-1:1996, IEC 60044-2:1997, IEC 60141-1, IEC 60376, IEC /T R61639:

1996, IEC 62271-100:2008, ISO 3231;

--- Delete the unquoted terms and definitions in the text, and re-describe "destructive discharge" (see Chapter 3, 3:17);

---According to the actual situation of my country's power grid, the relevant content of the rated frequency of 60Hz in the international standard has been deleted; according to my country's medium and high voltage

Classification custom, the applicable rated voltage is changed from "52kV and above" to "72:5kV and above" (see Chapter 1);

---Increase the lower limit of normal indoor and outdoor use conditions (see 4:3);

---Rated voltage, delete the rated voltage value that has nothing to do with my country's power grid, according to the voltage specified in GB/T 11022-2011

According to the actual situation of my country's power grid, relevant parameters with rated voltages of 800kV and 1100kV have been added (see 5:2);

--- The operation that does not rely on manpower or power is modified to GB/T 11022-2011 5:7 is not applicable (see 6:8);

---Added relevant technical requirements for equipment corrosion prevention (see 6:21);

---The criterion of 7:6:101 has been modified to be consistent with GB/T 11022-2011 (see 7:6:101);

--- Increased the ascent speed limit for the destructive pressure test (see 6:103:2);

---The expansion joint and related technical requirements have been added (see 6:108);

---Added the observation window and related technical requirements (see 6:109);

---Added the requirements for confirmatory test every eight years and the requirements for gas use and treatment (see 7:1:1);

--- Deleted the description of the short connecting wire on the voltage transformer in the short-time and peak withstand current test of the main circuit (see 7:6:101);

---Added the relevant requirements for the switchgear stroke---time characteristic measurement (see 7:102:3);

---Added the relevant requirements of the factory sealing test (see 8:5);

---According to the actual situation in my country, the specified value of the field test voltage in Table 7 has been modified (see 11:3:101:2:4);

---Adjust the informative appendix C of the international standard "Matters to be considered and related field test technology" to the normative appendix G:

This standard has made the following editorial changes:

---In order to be consistent with my country's technical standard system, the name of this standard is revised to "Gas Insulated Metal Seal with Rated Voltage 72:5kV and above

Closed switch equipment";

---In accordance with the requirements of GB/T 1:1-2009, the compilation of "scope" is standardized;

---The source of terms and definitions, replace IEC 60050-471 with GB/T 2900:8-2009, which is equivalent to adopting international standards:

2007; Replaced IEC 60050(441):1984 with GB/T 2900:20-2016 which was modified to adopt international standards;

---Added a note on "partition" (see 3:8);

---Added the explanation that the wet test is only carried out at the closing position (see 7:2:3);

--- Added the description that the basin insulators that have been type tested may not be tested repeatedly (see 7:106:1);

---Deleted the two informative appendices of Appendix G and Appendix H in the international standard:

This standard was proposed by China Electrical Equipment Industry Association:

This standard is under the jurisdiction of the National High Voltage Switchgear Standardization Technical Committee (SAC/TC65):

Drafting organizations of this standard: Xi'an High Voltage Apparatus Research Institute Co:, Ltd:, China Electric Power Research Institute Co:, Ltd:, State Grid Shaanxi Province

Electric Power Research Institute of Electric Power Company, Shanghai Xidian High Voltage Switchgear Co:, Ltd:, Xi'an Xidian Switch Electric Co:, Ltd:, New Northeast Electric Group

High Voltage Switchgear Co:, Ltd:, Pinggao Group Co:, Ltd:, Guangdong Power Grid Co:, Ltd: Dongguan Power Supply Bureau, Liaoning High Voltage Electrical Product Quality Inspection

Co:, Ltd:, Xiamen Huadian Switchgear Co:, Ltd:, ABB (China) Co:, Ltd:, Xiamen ABB High Voltage Switchgear Co:, Ltd:, Xi'an Xidian High

Pressure Switch Co:, Ltd:, Chuankai Electric Co:, Ltd:, Shandong Taikai High Voltage Switch Co:, Ltd:, Beijing Beikai Electric Co:, Ltd:, Special

Substation Zhongfa Shanghai High Voltage Switchgear Co:, Ltd:, TBEA Shenyang Electric Technology Research Institute Co:, Ltd:, Zhejiang Bada Electronic Instrument Co:, Ltd:

Si Shi Tong Electric Branch, Shanghai Siyuan High Voltage Switchgear Co:, Ltd:, Yihe Electric Group Co:, Ltd:, Yunnan Yunkai Electric Co:, Ltd:

Company, Huayi Electric Co:, Ltd:, Zhejiang Switch Factory Co:, Ltd:, Henan Senyuan Electric Co:, Ltd:, Haining Switch Factory Co:, Ltd:

Company, Risheng Group Co:, Ltd:

1 Scope

This standard specifies the terms and definitions, normal and special use conditions, ratings, design and structure of gas-insulated metal-enclosed switchgear:

Relevant requirements for configuration, type test, factory test and selection guidelines:

This standard applies to gas-insulated metal enclosures for indoor and outdoor installations with a rated voltage of 72:5kV and above and a rated frequency of 50Hz:

Switchgear (hereinafter referred to as "GIS" or "switchgear"), whose insulation is obtained at least partially through insulating gas rather than at atmospheric pressure

Down the air:

The gas-insulated metal-enclosed switchgear covered by this standard consists of independent components that can be directly connected together, and these components can only

Run in this way:

According to needs, this standard completes and supplements the relevant standards applicable to the individual components of the GIS:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

GB/T 1985-2014 high voltage AC isolating switch and earthing switch (IEC 62271-102:2001 A1:2011, MOD)

GB/T 2423:17-2008 Environmental testing of electric and electronic products Part 2: Test method Test Ka: Salt spray (IEC 60068-

2-11:1981, IDT)

GB/T 3785:1 Electroacoustic Sound Level Meter Part 1: Specifications (GB/T 3785:1-2010, IEC 61672-1:2002, IDT)

GB/T 3785:2 Electroacoustic Sound Level Meter Part 2: Type Evaluation Test (GB/T 3785:2-2010, IEC 61672-2:

2003, IDT)

GB/T 4109-2008 Insulating pipe sleeves with AC voltage higher than 1000V (IEC 60137:2008, MOD)

GB/T 7354 High Voltage Test Technology Partial Discharge Measurement (GB/T 7354-2018, IEC 60270:2000, MOD)

GB/T 8905 Gas management and detection guidelines in sulphur hexafluoride electrical equipment (GB/T 8905-2012, IEC 60480:2004,

MOD)

GB/T 9326 (all parts) AC 500kV and below paper or polypropylene composite paper insulated metal sheathed oil-filled cable and accessories

[IEC 60141 (all parts)]

GB/T 9789 Metal and other inorganic coatings, sulfur dioxide corrosion test under normal condensation conditions (GB/T 9789-2008,

ISO 6988:1985, IDT)

GB/T 11017:1 Rated voltage 110kV (Um=126kV) XLPE insulated power cable and its accessories Part 1:

Test methods and requirements (GB/T 11017:1-2014, IEC 60840:2011, MOD)

GB/T 11022-2011 Common technical requirements for high-voltage switchgear and control equipment standards (IEC 62271-1:2007, MOD)

GB/T 11023 High-voltage switchgear sulfur hexafluoride gas tightness test method

GB/T 12022 Industrial sulfur hexafluoride

GB/T 13540 Seismic requirements for high-voltage switchgear and control equipment (GB/T 13540-2009, IEC 62271-2::2003,

MOD)

GB/T 16927:1 High Voltage Test Technology Part 1: General Definition and Test Requirements (GB/T 16927:1-2011,