GB/T 20840.11-2025 English PDFUS$759.00 ยท In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20840.11-2025: Instrument transformers - Part 11: Additional requirements for low-power passive voltage transformers Status: Valid
Basic dataStandard ID: GB/T 20840.11-2025 (GB/T20840.11-2025)Description (Translated English): Instrument transformers - Part 11: Additional requirements for low-power passive voltage transformers Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: K41 Classification of International Standard: 29.180 Word Count Estimation: 38,327 Date of Issue: 2025-02-28 Date of Implementation: 2025-09-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 20840.11-2025: Instrument transformers - Part 11: Additional requirements for low-power passive voltage transformers---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. GB/T 20840.11-2025 English version. Instrument transformers - Part 11.Additional requirements for low-power passive voltage transformers ICS 29.180 CCSK41 National Standard of the People's Republic of China Instrument transformers Part 11.Low power passive voltage Supplementary technical requirements for transformers Instrumenttransformers-Part 11.Additionalrequirementsforlow-power Passive Voltage Transformers (IEC 61869-11.2017,MOD) Released on 2025-02-28 2025-09-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 5 Rating 4 6 Design and Structure 8 7 Test 11 601 Inquiry, Bidding and Ordering Notes17 Appendix 11A (Informative) Comparison of this document with IEC 61869-11.2017 structure number 19 Appendix 11B (Informative) Technical differences between this document and IEC 61869-11.2017 and their causes 20 Appendix 11C (Informative) Types of voltage divider principles covered by this document 21 Appendix 11D (Informative) Nominal accuracy class using corrected ratio and ratio correction factor 22 Appendix 11E (Normative) Adjacent phase electric field influence test 24 Appendix 11F (Informative) Test description of the influence of adjacent phase electric field 26 Reference 31 Figure 1101 General block diagram of single-phase low-power passive voltage transformer VI Figure 1102 Terminal marking 9 Figure 1103 RC voltage divider with external low voltage device 14 Figure 1104 Connection of voltage divider external low voltage device withstand voltage test 15 Figure 1105 Step response time of passive LPVT 17 Figure 11C.1 Voltage divider principle 21 Figure 11D.1 Improvement of nominal accuracy based on its own ratio correction factor CFU 22 Figure 11E.1 Test setup for LPVT in air-insulated substations 24 Figure 11F.1 Test setup with stray capacitance when the metal rod is grounded 26 Figure 11F.2 Equivalent circuit of the test device of Figure 11F.1 with current direction 27 Figure 11F.3 Test setup with stray capacitance between metal rod and LPVT when energized 27 Figure 11F.4 Equivalent circuit of the test device of Figure 11F.3 with current direction 28 Figure 11F.5 Test configuration of LPVT used in air-insulated substations 28 Table 1101 Ratio difference and phase error limits for passive LPVT measurements 6 Table 1102 Ratio difference and phase error limits for protection and multi-purpose passive LPVTs 7 Table 1103 Rated voltage factor standard value 7 Table 1104 Pinout of RJ45 connector used in passive LPVT 10 Table 11 Test Item 11 Table 1105 Load values for basic accuracy test 13 Table 1106 Items required to determine passive LPVT performance 17 Table 11A.1 Comparison of structure numbers between this document and IEC 61869-11.2017 19 Table 11B.1 Technical differences between this document and IEC 61869-11.2017 and their causes 20 Table 11F.1 Extended criteria for the influence of adjacent phase electric fields 30ForewordThis 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 is part 11 of GB/T 20840 "Transformers". GB/T 20840 has published the following parts. --- Part 1.General technical requirements; --- Part 2.Supplementary technical requirements for current transformers; --- Part 3.Supplementary technical requirements for electromagnetic voltage transformers; --- Part 4.Supplementary technical requirements for combined transformers; --- Part 5.Supplementary technical requirements for capacitor voltage transformers; --- Part 6.Supplementary general technical requirements for low power transformers; --- Part 7.Electronic voltage transformer; --- Part 8.Electronic current transformer; --- Part 9.Digital interface for transformers; --- Part 10.Supplementary technical requirements for low power passive current transformers; --- Part 11.Supplementary technical requirements for low power passive voltage transformers; --- Part 14.Supplementary technical requirements for DC current transformers; --- Part 15.Supplementary technical requirements for DC voltage transformers; --- Part 99.Terminology --- Part 100.Application Guidelines for Current Transformers for Power System Protection; --- Part 102.Ferroressonance in substations with electromagnetic voltage transformers; --- Part 103.Application of transformers in power quality measurements. This document is modified to adopt IEC 61869-11.2017 "Transformers - Part 11.Supplementary technical requirements for low power passive voltage transformers" beg". Compared with IEC 61869-11.2017, this document has many structural adjustments. Comparison table of structural changes between the two documents See Appendix 11A. This document has many technical differences compared with IEC 61869-11.2017. A list of these technical differences and their reasons is given in Appendix 11B. The following editorial changes were made to this document. --- The order of symbols has been adjusted (see 3.7); --- The header format of Table 1101 and Table 1102 has been adjusted (see 5.6.1103.3); --- Correct "2% rated voltage" to "80% rated voltage" (see 5.6.1101.1); --- Correct "passive LPCT" to "passive LPVT" (see 6.11.601); --- Added the introductory words "6.13 of GB/T 20840.6-2017 and the following supplementary contents apply." (see 6.13); --- Correct "Table 10" to "Table 11", adjust the order of "Capacitance and dielectric loss factor measurement" in the table, and change the The clause number of "Appendix 6A, 6A.5" is corrected to "6A.6.1" (see 7.1.2); --- Added the introductory words "7.2.2 of GB/T 20840.1-2010 and the following supplementary contents apply." (see 7.2.2); --- Adjust "Table 5" in the last sentence to "Table 6" (see 7.2.2.1102); --- The description of Figure 1104 of IEC 61869-11.2017 has been adjusted; --- The position of Tsr1 time in Figure 1105 of IEC 61869-11.2017 has been corrected; --- Added introductory words and corrected "3.2.601" in Table 1106 to "3.3.614" (see 601.1); --- Correct "Kcor" in paragraph 1 to "KcorU" (see 11D.1); --- Added Appendix 11F, which includes the adjusted interpretation of IEC 61869-11.2017/ISH1.2021; --- Replace the "low power passive voltage transformer" that appears repeatedly in the text with the abbreviation "passive LPVT"; ---The formulas in the whole text are numbered; --- Replaced IEC 61869-7 with the informative reference GB/T 20840.7 (see Chapter 1); --- Replaced IEC 60050-321.1986 with the informative reference GB/T 2900.94-2015 (see the source of 3.2.1101); --- Replaced IEC 61869-1.2007 with the informative reference GB/T 20840.1-2010 (see Table 1103 of 5.1102); --- Replaced IEC 61869-6.2016 with the informative reference GB/T 20840.6-2017 (see Note 1103 of 7.3.4, 7.4.1101 and 601.2); --- Replaced IEC 61869-6 with the informative reference GB/T 20840.6 (see 11D.1); --- Replaced IEC 61936-1.2010 with the informative reference GB/T 36271.1-2018 (see 10F.4). 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 Transformers (SAC/TC222). This document was drafted by. China Electric Power Research Institute Co., Ltd., Shenyang Transformer Research Institute Co., Ltd., Dalian North Instrument Transformer Group Group Co., Ltd., Zhejiang Tianji Instrument Transformer Co., Ltd., Denggao Electric Co., Ltd., Nanjing NARI Relay Protection Electric Co., Ltd., Jiangsu Kexing Electric Co., Ltd., Dalian No. 1 Instrument Transformer Co., Ltd., Shenzhen Chuangyin Technology Co., Ltd., Xi'an High Voltage Electric Appliance Research Institute Co., Ltd. Co., Ltd., Jiangsu Jingjiang Instrument Transformer Co., Ltd., Chongqing Shancheng Electric Factory Co., Ltd., Zhejiang Chint Electric Co., Ltd., Chongqing University, Electric Power Research Institute of Yunnan Power Grid Co., Ltd., and Electric Power Research Institute of State Grid Shaanxi Electric Power Company. The main drafters of this document are. Xu Sien, Liu Yufeng, Wang Benjin, Wang Rentao, Tang Fuxin, Song Siyu, Feng Yu, Luo Sunan, Yang Feng, Sha Yuzhou, Pingjiang Zhou, Jianhua Feng, Hua Huang, Nan Zhou, Wen Xu, Hui Li, Junjun Xiong, Lijun Tang, Hongwen Liu, Yicong Chen.IntroductionThe purpose of formulating the transformer standard is to establish a set of optimal evaluation criteria for the transformer, from raw material selection, design, production, etc. GB/T 20840 aims to specify the precautions applicable to transformers. The principles and relevant rules to be followed in design, manufacturing, testing, operation and maintenance are planned to consist of 16 parts. --- Part 1.General technical requirements. The purpose is to establish the requirements for the design, manufacture and production testing of various types of transformers. General technical requirements to be followed. --- Part 2.Supplementary technical requirements for current transformers. The purpose is to establish supplementary technical requirements applicable to various types of current transformers. Require. --- Part 3.Supplementary technical requirements for electromagnetic voltage transformers. The purpose is to establish the requirements applicable to various types of electromagnetic voltage transformers. Supplementary technical requirements. --- Part 4.Supplementary technical requirements for combined transformers. The purpose is to establish supplementary technical requirements applicable to various types of combined transformers. Require. --- Part 5.Supplementary technical requirements for capacitor voltage transformers. The purpose is to establish the requirements applicable to various types of capacitor voltage transformers. Supplementary technical requirements. --- Part 6.Supplementary general technical requirements for low power transformers. The purpose is to establish supplementary general technical requirements applicable to various types of low power transformers. Fill in the general technical requirements. --- Part 7.Electronic voltage transformers. The purpose is to establish supplementary technical requirements applicable to various types of electronic voltage transformers. --- Part 8.Electronic current transformers. The purpose is to establish supplementary technical requirements applicable to various types of electronic current transformers. --- Part 9.Digital interfaces for transformers. The purpose is to establish technical requirements for digital interfaces applicable to various types of electronic transformers. --- Part 10.Supplementary technical requirements for low power passive current transformers. The purpose is to establish Supplementary technical requirements for current transformers. --- Part 11.Supplementary technical requirements for low power passive voltage transformers. The purpose is to establish Supplementary technical requirements for voltage transformers. --- Part 14.Supplementary technical requirements for DC current transformers. The purpose is to establish supplementary technical requirements applicable to various types of DC current transformers. Fill in the technical requirements. --- Part 15.Supplementary technical requirements for DC voltage transformers. The purpose is to establish the requirements applicable to various types of DC voltage transformers. Supplementary technical requirements. --- Part 99.Terminology --- Part 100.Guidelines for the application of current transformers for power system protection. The purpose is to Provide guidance on the application of protection. --- Part 102.Ferroresistance in substations with electromagnetic voltage transformers. Provide guidance on the generation and suppression of ferromagnetic resonance in substations with voltage transformers. --- Part 103.Application of transformers in power quality measurement. The purpose is to describe the application of various types of transformers in power quality measurement. Provide guidance on use. GB/T 20840 defines the technical specifications of various types of transformer products through 16 parts, and gives specific technical requirements, test items, By establishing clear scope, terminology, technical requirements and test requirements for various products So that people engaged in product design, production, testing and use can operate more clearly and accurately, thus providing It lays the foundation for manufacturing high-quality products, better promotes trade, exchanges and technical cooperation, and provides guarantee for the normal operation of my country's power grid. This document is consistent with GB/T 20840.1-2010 "Mutual Inductors Part 1.General Technical Requirements" and GB/T 20840.6-2017 "Mutual Inductors This document complies with GB/T 20840.1-2010 and The writing structure of GB/T 20840.6-2017 is to supplement and modify the corresponding clauses. When the provisions of GB/T 20840.6-2017 are not mentioned in this document, they shall also apply to this document as long as it is reasonable. When the document indicates "supplement", "modification" or "replacement", it means the relevant part of GB/T 20840.1-2010 or GB/T 20840.6-2017. The terms are adapted accordingly in this document. For the chapters, clauses, figures, tables, notes and appendices added on the basis of GB/T 20840.1-2010 and GB/T 20840.6-2017, this The documents are numbered in the following format. --- The numbering of chapters, articles, figures, tables and notes starts from 1101; ---Appendices are numbered 11A, 11B, etc. Low power passive voltage transformers are based on the voltage divider principle and are classified as resistor voltage dividers, capacitor voltage dividers or resistor-capacitor voltage dividers. Appendix 11C Schematics of different voltage dividers are given. According to the general block diagram given in Figure 601 of GB/T 20840.6-2017, the low-power passive voltage transformer does not use an active primary converter (i.e., no active electronic components are used), so no primary power supply is required. In addition, no secondary converter or secondary power supply. Figure 1101 shows a general block diagram of a low power passive voltage transformer. The components required for low power passive voltage transformers are determined by the technology used. The transmission cable or a The secondary converter is not essential for the low power passive voltage transformer. Figure 1101 General block diagram of a single-phase low-power passive voltage transformer Instrument transformers Part 11.Low power passive voltage Supplementary technical requirements for transformers1 ScopeThis document specifies the terms and definitions, ratings, design and Supplementary technical requirements for design and structure, testing and consultation, bidding and ordering instructions, etc. This document is applicable to the rated frequency of 15Hz~100Hz, used for measuring and protecting electrical measuring instruments or relay protection devices. and a newly manufactured passive LPVT with analog output that combines measurement and protection functions. This document does not apply to passive LPVTs with derivative output signals, digital outputs or using any type of active electronic components. Electronic voltage transformer based on component technology. Note. Passive LPVTs have only analog voltage outputs (for digital outputs or the use of any type of active electronic components, refer to GB/T 20840.7). Such a passive LPVT may include a secondary signal cable (transmission cable). The secondary voltage of a passive LPVT is proportional to the primary voltage.2 Normative referencesThe contents of the following documents constitute 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. Chapter 2 of GB/T 20840.6-2017 and the following additions and modifications are applicable. GB/T 156 Standard Voltage (GB/T 156-2017, IEC 60038.2009, MOD) GB/T 16927.1-2011 High voltage test technology Part 1.General definitions and test requirements (IEC 60060-1.2010, MOD) GB/T 20840.1 Transformers Part 1.General Technical Requirements (GB/T 20840.1-2010, IEC 61869-1.2007, MOD) GB/T 20840.6 Transformers Part 6.Supplementary general technical requirements for low power transformers (GB/T 20840.6-2017, IEC 61869-6.2016, MOD)3 Terms and definitionsThe terms and definitions defined in GB/T 20840.1 and GB/T 20840.6 and the following supplements and modifications apply to this document. 3.1 General Definitions 3.1.613 Transmission system 3.1.613 of GB/T 20840.6-2017 and the following supplements are applicable. NOTE 1101.For passive LPVTs, the transmission system is only the transmission cable. 3.1.621 output signal 3.1.621 of GB/T 20840.6-2017 is replaced by the following. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20840.11-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 20840.11-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 20840.11-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20840.11-2025_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 Sales@ChineseStandard.net. 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. |
