GB/T 24840-2018 English PDF

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GB/T 24840-2018: Technical specification for bushings of 1 000 kV a.c. system
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Basic data

Standard ID: GB/T 24840-2018 (GB/T24840-2018)
Description (Translated English): Technical specification for bushings of 1 000 kV a.c. system
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K40
Classification of International Standard: 29.240.01
Word Count Estimation: 22,269
Date of Issue: 2018-07-13
Date of Implementation: 2019-02-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 24840-2018: Technical specification for bushings of 1 000 kV a.c. system

---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.
Technical specification for bushings of 1 000 kV AC system ICS 29.240.01 K40 National Standards of People's Republic of China Replace GB /Z 24840-2009 Technical specification for casing for 1000kV AC system Published on.2018-07-13 Implementation of.2019-02-01 State Market Supervisory Administration China National Standardization Administration issued

Content

Foreword III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 General conditions of use 2 5 System Overview 2 6 basic technical parameters 3 6.1 Bushing current rating Ir 3 6.2 rated insulation level of the casing 3 7 Technical performance requirements 3 7.1 Basic requirements 3 7.2 Dimensional requirements for the shape of the umbrella cover 3 7.3 Umbrella skirt and sheath material of composite casing 3 7.4 Tube material properties of composite casing 4 7.5 Dielectric loss factor of the bushing (tan δ) 4 7.6 Partial discharge of casing 4 7.7 Radio interference 4 7.8 Capacitor, dielectric loss factor (tan δ) and power frequency withstand voltage of test taps of transformer type bushings 4 7.9 Heating temperature and temperature rise of each part of the casing 5 7.10 Cantilever withstand load of casing 6 7.11 Thermal short-time current tolerated by the casing Ith 7 7.12 Performance of internal transformer oil in oil-filled insulating sleeves 7 7.13 Performance of gas inside gas-insulated casing 8 8 Test requirements and methods 8 8.1 General requirements for testing 8 8.2 Appearance and size inspection 9 8.3 Lightning impulse dry withstand voltage test 9 8.4 Power frequency dry withstand voltage test 9 8.5 Long-term power frequency withstand voltage test 9 8.6 Operational impulse withstand voltage test 10 8.7 Tan δ and capacitance measurement of transformer bushings 10 8.8 Measurement of partial discharge of casing 10 8.9 Transformer type casing test tap insulation test 10 8.10 Casing Thermal Stability Test 10 8.11 casing temperature rise test 11 8.12 casing short-time current withstand test 11 8.13 Seal Test 11 8.14 casing cantilever load withstand test 11 8.15 Seal test on flanges or other fasteners 11 9 Test Classification 12 9.1 Test one by one 12 9.2 Type test 12 9.3 Special test 13 9.4 On-site handover test 13 10 Transportation, storage, installation, operation and maintenance rules 14 10.1 General requirements 14 10.2 Transportation, storage and installation requirements 14 10.3 Installation Instructions 15 10.4 Disassembly and hoisting 15 10.5 Assembly 15 Reference 17

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB /Z 24840-2009 "Technical Specification for Casing for 1000kV AC System". Compared with GB /Z 24840-2009, the main technical changes of this standard except for editorial changes are as follows. --- Added the terminology and definition of "oil-SF6 casing" (see 3.4); --- Remove the requirement for voltage taps in the full text of the standard; --- Revised the typical parameter values of "tolerance to earthquakes" in Table 1, and proposed waters corresponding to seismic fortifications of 6, 7, and 8 respectively. Flat acceleration and vertical acceleration values (see Chapter 4, Chapter 4 of the.2009 edition); ---Modified the short-time power frequency withstand voltage test time in the rated insulation level of transformer bushing, modified from 1min to 5min (See 6.2, 6.2 of the.2009 edition); --- Removed the details of the performance requirements of the shed and jacket material of the composite casing (see 7.3 of.2009 edition); --- Removed the details of the pipe material performance requirements of the composite casing (see 7.4 of the.2009 edition); --- Removed the maximum requirement for dielectric loss factor of gas-insulated bushings (see 7.5 of.2009 edition); --- Modified the partial discharge measurement voltage value of the bushing, and changed "1.05Um/3" to "1.1Um/3" (see 7.6,.2009 edition) 7.6); ---Modified the dielectric loss factor limit requirement of the test tap, and changed "tan δ ≤ 0.03" to "tan δ ≤ 0.02" (see 7.8,.2009 edition) 7.9); --- Add the moisture content requirements of new inflated bodies and operating gases in the "Gas Insulation Inside Gas Performance" entry (see 7.13); --- The oil-SF6 casing test requirements have been added to the test requirements (see 8.1); --- Revised the lightning impulse dry withstand voltage test requirements, distinguishing the type test and the test procedure one by one (see 8.3,.2009 edition) 8.4); --- Modified the test voltage value in the long-term power frequency withstand voltage program, and modified the highest test voltage 1.7Um/3 to Um (see 8.5, 7.7 of the.2009 edition; --- Revised the sealing test requirements for oil-filled insulating bushings and increased the type test requirements (see 8.13, 7.12 of the.2009 edition); --- "The long-term power frequency withstand voltage of the transformer type casing" "The thermal stability of the casing" "The sealing test of the oil-filled insulating sleeve" and The contents of the “Insulation Test for Insulating Bushings” entry are moved to the “Test Requirements and Methods” section (see Chapter 8,.2009 Edition). 7.7, 7.10, 7.12, 7.13); --- Revised the type test project sequence and adjusted the temperature rise test to the internal pressure test (see 9.2, 9.2 of the.2009 edition); --- The type of casing type test item is changed to "measurement terminal capacitance and tan δ measurement" to "test tap insulation test" (see 9.2, 9.2) of the.2009 edition; --- Increased long-term performance test of casing (see 9.3). This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the National UHV AC Transmission Standardization Technical Committee (SAC/TC569). This standard is drafted by. State Grid Corporation, China Electric Power Research Institute Co., Ltd., State Grid Electric Power Research Institute Wuhan South Rui limited liability company. Participated in the drafting of this standard. Xi'an Jiaotong University, Xi'an Xidian Electric Research Institute Co., Ltd., Jiangsu Shenma Power Co., Ltd. Company, Xi'an Xidian High Voltage Casing Co., Ltd., Nanjing Electric (Group) Co., Ltd., TBEA Shenyang Transformer Group Co., Ltd. The main drafters of this standard. Wang Xiaoqi, Liu Zehong, Peng Zongren, Sun Gang, Wu Shipu, Wu Zhirong, Hu Wei, Xie Xiongjie, Xu Zuoming, Chen Guoqiang, Dang Zhenping, Ma Bin, He Ping, Su Zhiyi, Zhu Bin, Nie Dexin, Yao Tao, Wang Xi. The previous versions of the standards replaced by this standard are. ---GB /Z 24840-2009. Technical specification for casing for 1000kV AC system

1 Scope

This standard specifies the technical performance requirements of the casing for 1000kV AC system, one test, type test and on-site handover test. This standard applies to 1000kV voltage for 1000kV AC system transformer equipment and gas insulated metal-enclosed switchgear. Grade casings, sleeves for other equipment can be used as reference.

2 Normative references

The 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. GB/T 2423.23-2013 Environmental testing - Part 2. Test method test Q. Sealing GB/T 2900.5 Electrotechnical terminology for insulating solids, liquids and gases GB/T 2900.8 Electrotechnical terminology insulator GB/T 4109-2008 Insulating bushings with AC voltage higher than 1000V GB/T 11022-2011 Common technical requirements for high voltage switchgear and control equipment standards GB/T 16927.1-2011 High voltage test techniques - Part 1. General definitions and test requirements GB/T 21429-2008 Definitions, test methods, acceptance criteria and design of hollow composite insulators for outdoor and indoor electrical equipment recommend GB/T 23752-2009 Pressure-bearing and non-pressure-bearing hollow porcelain and glass insulators for electrical equipment with rated voltages above 1000V GB/T 26218 (all parts) Selection and sizing of high-voltage insulators used under dirty conditions DL/T 1277-2013 Technical specification for 1100kV AC hollow composite insulator DL/T 1408-2015 1000kV AC system oil - sulphur hexafluoride bushing technical specification

3 Terms and definitions

The following terms and definitions as defined in GB/T 2900.5, GB/T 2900.8, GB/T 4109-2008 apply to this document. 3.1 Oil-impregnated paper porcelain casing oil-impregnatedpaperporcelainbushing The core of the main insulation is wound by paper. After treatment, it is impregnated with an insulating liquid (usually transformer oil). The insulating jacket is made of hollow ceramic insulator. Casing for transformer equipment. Note. The core is housed in an insulating jacket and the space between the core and the insulating jacket is filled with the same insulating liquid as used in the impregnation. 3.2 Gas insulated composite casing gas-insulatedcompositebushing The main insulation consists of a gas above atmospheric pressure (except air), and the insulating jacket is a gas-insulated metal composed of hollow composite insulators. A sleeve for a closed switchgear ("switching device"). 3.3 Gas insulated porcelain casing gas-insulatedporcelainbushing The main insulation consists of a gas above atmospheric pressure (except air), and the insulating jacket is a sleeve for a switchgear made up of hollow ceramic insulators. ......

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