|
US$1899.00 · In stock
Delivery: <= 10 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 28182-2024: Surge arresters containing series gapped structures with rated voltage 52 kV and less
Status: Valid GB/T 28182: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 28182-2024 | English | 1899 |
Add to Cart
|
10 days [Need to translate]
|
Surge arresters containing series gapped structures with rated voltage 52 kV and less
| Valid |
GB/T 28182-2024
|
| GB/T 28182-2011 | English | 1999 |
Add to Cart
|
7 days [Need to translate]
|
Surge arresters containing series gapped structures with rated voltage 52 kV and less
| Obsolete |
GB/T 28182-2011
|
PDF similar to GB/T 28182-2024
Basic data | Standard ID | GB/T 28182-2024 (GB/T28182-2024) | | Description (Translated English) | Surge arresters containing series gapped structures with rated voltage 52 kV and less | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K49 | | Word Count Estimation | 94,970 | | Date of Issue | 2024-05-28 | | Date of Implementation | 2024-12-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 28182-2024: Surge arresters containing series gapped structures with rated voltage 52 kV and less
---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.
ICS 29.080.99
CCSK49
National Standards of People's Republic of China
Replace GB/T 28182-2011
Rated voltage 52kV and below with series connection
Gap arrester
(IEC 60099-6.2019,Surgearresters-Part 6.Surgearresters
Released on 2024-05-28 Implemented on 2024-12-01
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface V
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Marking and classification 9
4.1 Lightning arrester marking 9
4.2 Arrester classification 10
5 Standard Ratings and Operating Conditions 10
5.1 Standard rated voltage 10
5.2 Standard rated frequency 10
5.3 Standard nominal discharge current 10
5.4 Operating conditions 10
6 Technical Requirements11
6.1 Insulation withstand 11
6.2 Residual pressure 11
6.3 Impact protection level 12
6.4 Partial discharge 12
6.5 Sealing performance 12
6.6 Thermal stability 12
6.7 Heat dissipation characteristics 12
6.8 Repeated Charge Transfer Tolerance 12
6.9 Action load 12
6.10 Power frequency voltage withstand time characteristics 12
6.11 Short circuit performance 12
6.12 Disconnector 13
6.13 Leakage current 13
6.14 Power frequency discharge 13
6.15 Mechanical load 13
6.16 End of Life 13
6.17 Anti-fouling performance 14
6.18 High current impact tolerance 14
6.19 Packaging, transportation and storage 14
6.20 Typical information provided in inquiries and bids 14
7 Test requirements 14
7.1 Measuring equipment and accuracy 14
7.2 Sample 14
8 Type test (design test) 15
8.1 General 15
8.2 Insulation withstand test 16
8.3 Impact protection level test 17
8.4 Repeated charge transfer test 20
8.5 Action load test 22
8.6 Power frequency voltage withstand time characteristic test 24
8.7 Disconnector test 26
8.8 Power frequency discharge voltage test 28
8.9 Short circuit test 29
8.10 Bending load test 36
8.11 Environmental testing 38
8.12 Sealing test 38
8.13 Internal component insulation withstand test 39
8.14 Leakage current test 40
8.15 Partial discharge test 40
8.16 Unified creepage distance inspection 40
8.17 High current impulse withstand test 40
9 Routine tests, acceptance tests, periodic tests and sampling tests 40
9.1 Routine test 40
9.2 Acceptance test 41
9.3 Periodic testing 41
9.4 Sampling test 41
10 Composite jacket arrester 42
10.1 Scope 42
10.2 Normative references 42
10.3 Terms and Definitions 42
10.4 Marking and classification 42
10.5 Standard ratings and operating conditions 42
10.6 Technical requirements 42
10.7 Test requirements 43
10.8 Type test (design test) 44
10.9 Routine tests, acceptance tests, periodic tests and sampling tests 57
Appendix A (Informative) Comparison of this document with IEC 60099-6.2019 structure number 59
Appendix B (Informative) Technical differences between this document and IEC 60099-6.2019 and their causes 62
Appendix C (Normative) Abnormal operating conditions 70
Appendix D (Normative) Typical electrical parameters of lightning arresters 71
Appendix E (Normative) Mechanical Test 73
E.1 Bending load test 73
E.2 Definition of mechanical load 73
E.3 Calculation of wind pressure 73
E.4 Bending load test procedure 74
Appendix F (Normative) Packaging, transportation and storage 76
F.1 Packaging 76
F.2 Technical documents provided with the product 76
F.3 Transportation and storage 76
Appendix G (Informative) Typical information provided in inquiries and bids 77
G.1 Information provided in the inquiry 77
G.2 Information provided in the bid 78
Appendix H (Normative) Thermal Equivalence Test 79
H.1 General 79
H.2 Test of the entire arrester 79
H.3 Thermal Proportional Unit Test 79
H.4 Relative temperature rise 79
H.5 Starting temperature determination 80
References 81
Figure 1 Resistor repeated charge transfer test procedure 20
Figure 2 Series gap repeated charge transfer test procedure 21
Figure 3 Rated heat transfer charge Qth test procedure 22
Figure 4 Power frequency voltage withstand time characteristic test procedure (TOV test) 25
Figure 5 Arrester structure example 32
Figure 6 Example of fuse installation position of "Design A" arrester 33
Figure 7 Example of fuse installation position of "Design B" arrester 33
Figure 8 Porcelain jacket arrester short circuit test arrangement 34
Figure 9 Short-circuit test arrangement of composite jacket arrester 48
Figure 10 Test circuit for repeated application of short-circuit current immediately after pre-fault application 49
Figure 11 Hot engine test 51
Figure 12 Arrangement of thermal mechanical test and bending load direction 52
Figure 13 Water immersion test 53
Figure E.1 Definition of mechanical load 73
Figure E.2 Arrester dimensions 74
Figure E.3 Flowchart of bending load test procedure 75
Table 1 Classification of distribution type lightning arresters 10
Table 2 Rated voltage difference 10
Table 3 Type test items 16
Table 4 High current impact requirements 23
Table 5 Rated heat transfer charge Qth 24
Table 6 Test requirements for porcelain-coated arresters 31
Table 7 Current values for short circuit test 35
Table 8 Routine test items 40
Table 9 Acceptance test items 41
Table 10 Periodic test items 41
Table 11 Sampling test items 42
Table 12 Type test items 44
Table 13 Test requirements for composite jacket arresters 47
Table 14 Routine test items 57
Table 15 Periodic test items 58
Table A.1 Comparison of structure numbers between this document and IEC 60099-6.2019 59
Table B.1 Technical differences between this document and IEC 60099-6.2019 and their causes 62
Table D.1 Typical electrical parameters of lightning arresters for power stations and distribution 71
Table D.2 Typical electrical parameters of lightning arresters for motors 72
Table D.3 Rated repetitive transfer charge Qrs of typical lightning arresters 72
Table E.1 Maximum allowable horizontal tension 73
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document replaces GB/T 28182-2011 "Arrester with series gap for rated voltage 52kV and below" and is compatible with GB/T 28182-
In addition to structural adjustments and editorial changes compared to.2011, the main technical changes are as follows.
--- Change "General Principles" to "Scope" and incorporate the relevant contents of the.2011 edition after modification (see Chapter 1,.2011 edition
Chapter 1, 1.1);
--- Add normative references GB/T 2900.12-2008 and GB/T 26218.1-2010 (see Chapter 3);
--- Added terms and definitions "bending moment", "destruction load", "resin cast jacket arrester", "arrester with series gap", "damage limit
(mechanical)” “Distribution arrester” “Electrical component” “System maximum voltage” “Jacket” “Insulating base” “Internal components” “Tensile load
load”, “average breaking load”, “mechanical components”, “mounting bracket”, “rated short-circuit current”, “rated repeated transfer charge”, “seal (gas/water
Sealing)””Shell””Specified long-term load””Specified short-term load””Terminal horizontal pull force””Rated heat transfer charge” and
"Torsional load" (see 3.3, 3.4, 3.5, 3.6, 3.8, 3.12, 3.13, 3.14, 3.19, 3.21, 3.23, 3.27, 3.28, 3.29, 3.30,
3.43, 3.45, 3.48, 3.51, 3.52, 3.53, 3.57, 3.58 and 3.61);
--- Deleted the terms and definitions "gapless metal oxide arrester", "internal voltage grading system of arrester", "voltage grading ring of arrester"
"Long duration impulse current", "apparent peak duration of square wave impulse", "apparent total duration of square wave impulse", "lightning protection
"operating impulse current of the arrester", "continuous current of the arrester", "reference current of the series metal oxide resistor column", "series metal oxide
"Power frequency reference current of metal oxide resistor column" "DC reference current of metal oxide resistor column" "
Reference voltage of resistor column" "Power frequency reference voltage of series metal oxide resistor column" "Series metal oxide resistor column
DC reference voltage", "breakdown discharge of lightning arrester", "average discharge voltage", "power frequency discharge voltage", "lightning impulse discharge voltage"
"Lightning arrester impulse discharge voltage" "Lightning arrester wavefront impulse discharge voltage" "Lightning arrester standard lightning impulse discharge voltage" "Lightning arrester
Pre-discharge time", "Impulse discharge volt-second characteristic curve", "Equalizing current", "Metal oxide arrester with gap structure", "Working
Frequency discharge voltage”, “Line lightning arrester”, “Impulse protection level”, “Operation impulse protection level”, “Series metal oxide resistor column”
"Parallel gap" and "Switching impulse voltage" (see 2.1, 2.3, 2.4, 2.18, 2.26, 2.27, 2.32, 2.33, 2.34,
2.34.1, 2.34.2, 2.35, 2.35.1, 2.35.2, 2.46, 2.48, 2.48.1, 2.48.2, 2.49, 2.50, 2.51, 2.52, 2.53, 2.54,
2.55, 2.56, 2.57, 2.58, 2.58.3, 2.59, 2.61 and 2.62);
--- Changed the information on "arrester marking" (see 4.1, 3.1 of the.2011 edition);
--- Changed the relevant content of "Lightning Arrester Classification" (see Table 1, Table 1 of the.2011 edition);
--- Changed the relevant content of "normal operating conditions" (see 5.4.1, 4.4.1 of the.2011 edition);
--- Changed the technical requirements of "insulation tolerance" (see 6.1, 5.1 of the.2011 edition);
--- Added technical requirements for "residual pressure" (see 6.2);
--- Deleted the technical requirements for "reference voltage" (see 5.2 of the.2011 edition);
--- Change "seal leakage" to "seal performance" and change the corresponding technical requirements (see 6.5, 5.5 of the.2011 edition);
--- Added technical requirements for "heat dissipation characteristics" (see 6.7) and "repeated charge transfer tolerance" (see 6.8);
--- Deleted the technical requirements of "long duration impulse current withstand" (see 5.7 of the.2011 edition);
--- Changed the technical requirements of "action load" (see 6.9, 5.8 of the.2011 edition) and "power frequency voltage withstand time characteristics"
See 6.10, 5.9 of the.2011 edition;
--- Change "short-circuit tolerance" to "short-circuit performance" and change the corresponding technical requirements (see 6.11, 5.10 of the.2011 edition);
--- Changed the technical requirements for "disconnector tolerance" (see 6.12.1, 5.11.1 of the.2011 edition);
--- Deleted the technical requirements of "Requirements for internal and external pressure equalizing elements" (see 5.12 of the.2011 edition);
--- Changed the technical requirements for "leakage current" (see 6.13, 5.20 of the.2011 edition) and "power frequency discharge" (see
6.14, 5.13 of the.2011 edition);
--- Deleted the technical requirements of "balanced voltage and current" (see 5.14 of the.2011 edition);
--- Changed the technical requirements for "mechanical load" (see 6.15, 5.16 of the.2011 edition);
--- Added technical requirements for "end of life" (see 6.16);
--- Changed the technical requirements for "fouling resistance" (see 6.17, 5.18 of the.2011 edition);
--- Deleted the technical requirements of "moisture intrusion test" (see 5.19 of the.2011 edition);
--- Added the technical requirements for "high current impulse tolerance" (see 6.18);
--- Added technical requirements for “packaging, transportation and storage” (see 6.19);
--- Added technical requirements for "typical information provided in inquiries and bids" (see 6.20);
--- Replace IEC 60060-2 with the normative reference GB/T 16927.2 (see 7.1);
--- Change "General test procedures" to "Test requirements", and incorporate the relevant contents of the.2011 edition after modification (see Chapter 7, 7.1,
7.2.1, Chapter 6, 6.1, 6.3 of the.2011 edition);
--- Added "residual pressure test proportion unit" (see 7.2.2), "repeated charge transfer test specimen" (see 7.2.3) and "thermal proportion unit"
(See 7.2.4) test requirements;
--- Deleted the test requirements of "reference voltage measurement" (see 6.2 of the.2011 edition);
--- Changed the relevant content of "Type test items" (see Table 3, Table 5 of the.2011 edition);
--- Changed the test method of "Insulation Withstand Test" (see 8.2, 7.2 of the.2011 edition);
--- Deleted the "operation shock residual pressure test" (see 7.3.4 of the.2011 edition) and the "operation shock protection level test" (see 7.3.4 of the.2011 edition)
7.3.8) of the test method;
--- Replace IEC 60060-1 with the normative reference GB/T 16927.1 (see 8.2.3, 8.2.4);
--- Replace IEC 60071-2.2018 with the normative reference GB/T 311.2-2013 (see 8.2.5);
--- Changed the relevant content of "discharge voltage test" (see 8.3.3, 7.3.5 of the.2011 edition);
--- Added the test method of "repeated charge transfer test" (see 8.4);
--- Deleted the test method of "long duration impulse current withstand test" (see 7.4 of the.2011 edition);
--- Changed the "action load test" (see 8.5, 7.5 of the.2011 edition) and the "power frequency voltage withstand time characteristic test" (see 8.6,
Test method in Appendix C of the.2011 edition;
--- Changed the test method of "tolerance test" (see 8.7.2, 7.6.2 of the.2011 edition), added "mechanical test" (see 8.7.4),
Test method for “temperature cycle and sealing test” (see 8.7.5);
--- Changed the test method of "power frequency discharge voltage test" (see 8.8, 7.7 of the.2011 edition);
--- Deleted "moisture intrusion test" (see 7.8 of the.2011 edition), "voltage and current test" (see 7.10 of the.2011 edition) and "reference
Voltage test" (see 7.11 of the.2011 edition);
--- Changed the relevant content of "short circuit test" (see 8.9, 7.16 of the.2011 edition);
--- Change "mechanical load test" to "bending load test" and change the corresponding test method (see 8.10,.2011 edition
7.13);
--- Added the test method of "environmental test" (see 8.11);
--- Replace IEC 60068-2-14 with the normative reference GB/T 2423.22-2012 (see 8.11.3.2);
--- Replace IEC 60068-2-11.1981 with the normative reference GB/T 2423.17-2008 (see 8.11.3.3);
--- Changed the test method of "sealing test" (see 8.12, 7.12 of the.2011 edition);
--- Added the test method of "internal component insulation withstand test" (see 8.13);
--- Replace IEC 60270 with GB/T 7354 which is modified to adopt IEC documents (see 8.15);
--- Change "creepage distance inspection" to "unified creepage distance inspection" and change the corresponding test method (see 8.16,.2011 edition
7.15);
--- Added the test method of "large current impulse withstand test" (see 8.17);
--- Deleted the test method of "arrester pollution test" (see 7.18 of the.2011 edition);
--- Changed the relevant content of "routine test, acceptance test, periodic test and sampling test" (see Chapter 9,.2011 edition
Chapter 8);
--- Added Chapter 10 "Composite jacket arresters" and incorporated the relevant contents of the.2011 edition after modification (see Chapter 10,.2011
5.15, 5.16.3, 5.17, 7.9, 7.14 of the.2017 edition);
--- Replace IEC 62217 with the normative reference GB/T 22079 (see 10.8.17.2.3);
---Replace ISO 4892-1 with normative references GB/T 16422.1-2019, and replace ISO 4892-1 with normative references GB/T 16422.2-
2022 replaces ISO 4892-2, and the normative reference GB/T 16422.3-2022 replaces ISO 4892-3 (see 10.8.17.3.1);
--- Replace ISO 4287 with the normative reference GB/T 3505 (see 10.8.17.3.2);
--- Added typical arrester electrical parameters for system nominal voltage 20kV, and changed "system rated voltage" to "system nominal voltage".
Nominal voltage” (see Table D.1, Table D.1 of the.2011 edition);
--- Added "Rated repetitive transfer charge Qrs of typical arresters" (see Table D.3);
--- Added "mechanical test" (see Appendix E);
--- Changed the relevant content of "Packaging, transportation and storage" (see Appendix F, Appendix G of the.2011 edition);
--- Changed the relevant content of "Thermal Equivalence Test" (see Appendix H, Appendix B of the.2011 edition);
--- Deleted the "Test procedure for verifying the power frequency voltage withstand time characteristics of lightning arresters" and "Typical maximum protection level" (see the.2011 edition
Appendix C, Appendix F).
This document is modified to adopt IEC 60099-6.2019 "Lightning arresters Part 6.System voltage 52kV and below with series and parallel gaps
lightning arrester".
Compared with IEC 60099-6.2019, this document has many structural adjustments. A comparison of the structural number changes between the two documents
See Appendix A for the table.
This document has many technical differences compared to IEC 60099-6.2019.A list of these technical differences and their causes is given in Appendix B.
The following editorial changes were made to this document.
---Change the name of the standard to "arrester with series gap for rated voltage 52kV and below".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee for Standardization of Lightning Arrester (SAC/TC81).
This document was drafted by. Xi'an High Voltage Electric Appliance Research Institute Co., Ltd., Yonggu Group Co., Ltd., Xi'an Shendian Electric Co., Ltd.
Company, China Electric Power Research Institute Co., Ltd., Xi'an Xidian Lightning Arrester Co., Ltd., Ningbo Zhenhai Guochuang High Voltage Electrical Equipment Co., Ltd.
Nanyang Zhongwei Electric Co., Ltd., Chint Electric Co., Ltd., Sichuan Zhongguang Lightning Protection Technology Co., Ltd., Guangxi Power Grid Co., Ltd.
The company's Electric Power Research Institute, State Grid Henan Electric Power Company Ultra-High Voltage Company, Dalian North Lightning Arrester Co., Ltd., State Grid Zhejiang Electric Power Co., Ltd.
Electric Power Research Institute, Zhejiang Zhongneng Electric Co., Ltd., Jiangxi Baixin Electric Porcelain Electric Co., Ltd., Jiaxing Ruijia Electric Co., Ltd.
Company, Hangzhou Yongde Electric Co., Ltd., Shanghai Zhimeng Electric Technology Co., Ltd., Jinguan Electric Co., Ltd., Jiangdong Hardware Equipment Co., Ltd.
Company, Nanyang Jinniu Electric Co., Ltd., Fushun Electric Porcelain Manufacturing Co., Ltd., Dalian Fafuan Electric Co., Ltd., China Southern Power Grid Co., Ltd.
He served as the company's ultra-high voltage transmission company, Hengda Electric Co., Ltd., Pinggao Toshiba (Langfang) Lightning Arrester Co., Ltd., Zhejiang Yuanneng Electric Power Technology Co., Ltd.
Company, Zhejiang Volt Electric Co., Ltd.
The main drafters of this document are. Zhang Yimin, Li Zhenyong, Liu Chen, Li Yuan, Sun Quan, Huang Yong, Wang Jiansheng, Wang Baoshan, He Jimou, Mi Pu, Jia Dongxu,
Li Xiangjun, Liu Bin, Xiong Yi, Zuo Zhongqiu, Wang Lulu, Li Jingbiao, Yang Jun, Liu Jiefeng, Cui Zhimei, Lu Yong, Gao Yonghai, Jin Zushan, Yang Lei, Shen Ziqiang,
Dong Jianhong, Jiang Cheng, Wu Hui, Xu Xueting, Guo Yongcheng, Jin Guoqing, Chen Zhan, Hou Bing, Wu Shaojun, Zou Yansheng, Liu Fei, Li Baobing, Wang Zheng, and Wang Song.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2011 as GB/T 28182-2011;
---This is the first revision.
Rated voltage 52kV and below with series connection
Gap arrester
1 Scope
This document specifies the marking and classification, standard ratings and operating conditions of series gap arresters with rated voltage of 52kV and below.
Technical requirements, test methods, inspection rules, etc.
This document applies to lightning arresters with internal series gaps (hereinafter referred to as lightning arresters) designed to limit overvoltages in AC power systems.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 191-2008 Pictorial symbols for packaging, storage and transportation (ISO 780.1997, MOD)
Note. There is no technical difference between the referenced content of GB/T 191-2008 and the referenced content of ISO 780.1997.
GB/T 311.2-2013 Insulation coordination Part 2.Guidelines for use (IEC 60071-2.1996, MOD)
Note. There is no technical difference between the referenced content of GB/T 311.2-2013 and the referenced content of IEC 60071-2.1996.
GB/T 2423.17-2008 Environmental testing for electric and electronic products Part 2.Test method Test Ka. Salt spray (IEC 60068-
2-11.1981,IDT)
GB/T 2423.22-2012 Environmental testing Part 2.Test method Test N. Temperature change (IEC 60068-2-14.
2009, IDT)
GB/T 2900.12-2008 Electrical terminology Lightning arresters, low voltage surge protectors and components
GB/T 3505 Product Geometry Specification (GPS) Surface Structure Profile Method Terminology, Definitions and Surface Structure Parameters
(GB/T 3505-2009, ISO 4287.1997, IDT)
GB/T 7354 High voltage test technique Partial discharge measurement (GB/T 7354-2018, IEC 60270.2000, MOD)
GB/T 16422.1-2019 Plastics laboratory light source exposure test method Part 1.General (ISO 4892-1.2016,
IDT)
GB/T 16422.2-2022 Plastics laboratory light source exposure test method Part 2.Xenon arc lamp (ISO 4892-2.
2013, IDT)
GB/T 16422.3-2022 Plastics laboratory light source exposure test method Part 3.Fluorescent ultraviolet lamp (ISO 4892-3.
2016, IDT)
GB/T 16927.1 High voltage test technology Part 1.General definitions and test requirements (GB/T 16927.1-2011,
IEC 60060-1.2010,MOD)
GB/T 16927.2 High voltage test technology Part 2.Measurement system (GB/T 16927.2-2013, IEC 60060-2.
2010,MOD)
GB/T 16927.4 High voltage and high current test technology Part 4.Definition and requirements of test current and measurement system
(GB/T 16927.4-2014,IEC 62475.2010, MOD)
GB/T 22079 General definitions, test methods and acceptance criteria for high-voltage polymer insulators for indoor and outdoor use (GB/T 22079-
2019,IEC 62217.2012,MOD)
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 28182-2024_English be delivered?Answer: Upon your order, we will start to translate GB/T 28182-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 10 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 28182-2024_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 28182-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. Question 5: Should I purchase the latest version GB/T 28182-2024?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 28182-2024 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.
|