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GB/T 46131-2025: Technical requirements and test methods for tap-changer for ultra high voltage transformers
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Technical requirements and test methods for tap-changer for ultra high voltage transformers
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Standard similar to GB/T 46131-2025 GB/T 40588 | GB/T 40427 | GB/T 40609 | GB/T 35732 | GB/T 28815 | Basic data | Standard ID | GB/T 46131-2025 (GB/T46131-2025) | | Description (Translated English) | Technical requirements and test methods for tap-changer for ultra high voltage transformers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F21 | | Classification of International Standard | 29.020 | | Word Count Estimation | 38,377 | | Date of Issue | 2025-08-29 | | Date of Implementation | 2025-12-01 | | Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China | GB/T 46131-2025: Technical requirements and test methods for tap-changer for ultra high voltage transformers
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ICS 29.020
CCSF21
National Standards of the People's Republic of China
Technical requirements for tap changers used in ultra-high voltage transformers
With test methods
Published on 2025-08-29
Implemented on December 1, 2025
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of Contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Basic Requirements 1
5.Parameter Requirements 2
6.Technical requirements for non-excitation tap changers 3
7.No-load tap changer test 6.
8.Technical requirements for on-load tap changers 11
9.On-load tap changer test 14
10.Marking, Packaging, Transport and Storage 25.
Appendix A (Informative) Arrangement of Forward and Reverse Adjustment Contacts for Unloaded Tap Changers in UHV AC Autotransformers 27
Appendix B (Normative) Seismic Test Method for Tap Changers of UHV AC Transformers 30
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Electricity Council.
This document is under the jurisdiction of the National Technical Committee on Standardization of Ultra-High Voltage AC Transmission (SAC/TC569).
This document was drafted by. China Electric Power Research Institute Co., Ltd., Shanghai Huaming Electric Equipment Manufacturing Co., Ltd., and TBEA Hengyang.
Transformer Co., Ltd., Baoding Tianwei Baobian Electric Co., Ltd., State Grid Sichuan Electric Power Research Institute, State Grid Shandong Electric Power Research Institute
Electric Power Research Institute of China Electric Power Corporation, TBEA Shenyang Transformer Group Co., Ltd., Xi'an XD Transformer Co., Ltd., and Kaide Trade Co., Ltd.
Yi (Shanghai) Co., Ltd., Hefei Hitachi Energy Transformer Co., Ltd., State Grid Jiangxi Electric Power Research Institute, State Grid Zhejiang
Jiangxi Electric Power Research Institute, State Grid Hunan Electric Power Research Institute, State Grid Henan Electric Power Company
Electric Power Research Institute, State Grid Hubei Electric Power Company Electric Power Research Institute, State Grid Anhui Electric Power Company Electric Power Research Institute
Shandong Electric Power Equipment Co., Ltd., State Grid Shanxi Electric Power Research Institute, Chongqing Hitachi Energy Transformer Co., Ltd., State Grid...
Shanghai Electric Power Research Institute, State Grid Hunan Electric Power Co., Ltd. Ultra-High Voltage Substation Company, China Southern Power Grid Co., Ltd.
State Grid Corporation of China.
The main drafters of this document are. Wang Shaowu, Zhang Shuqi, Wang Ke, Li Peng, Li Jinzhong, Li Geqi, Du Xiuming, Qiao Mu, Sun Jiantao, and Li Xianwei.
Zhao Feng, Sun Shubo, Liu Xueli, Li Gang, Zhang Zhiyong, Ye Zhuangzhuang, Hu Wenbin, Sun Gongsheng, Luo Xinyu, Yang Zhi, Zhu Mengzhao, Xu Puming, Dong Dalei
Wu Xingwang, Chai Mengdong, Yu Hua, Wei Yihua, He Lin, Zhou Kai, Wang Peng, Wang Yilin, Sun Wei, Li Wenzhi, Wang Yuwei.
Technical requirements for tap changers used in ultra-high voltage transformers
With test methods
1.Scope
This document specifies the basic requirements, parameter requirements, technical requirements, marking, packaging, and transportation of tap changers for 1000kV AC transformers.
It covers topics such as storage and describes the corresponding experimental methods.
This document applies to the design and acceptance of tap changers for 1000kV AC transformers (including autotransformers and step-up transformers).
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.
For references to documents, only the version dated [date] applies to this document; for undated references, the latest version (including all amendments) applies.
document.
GB/T 2900.95 Electrical Engineering Terminology. Transformers, Voltage Regulators and Reactors
GB/T 4208 Degrees of protection provided by enclosures (IP code)
GB/T 4797.4 Classification of Environmental Conditions - Natural Environmental Conditions - Solar Radiation and Temperature
GB/T 10230.1-2019 Tap changers - Part 1.Performance requirements and test methods
GB/T 10230.2 Tap changers - Part 2.Application guidelines
GB/T 17623 Gas Chromatography Determination of Dissolved Gas Components in Insulating Oil
GB/T 42558.1 Seismic technology for electrical equipment in converter stations for high-altitude applications - Part 1.Guidelines for seismic testing and evaluation
GB 50260 Code for Seismic Design of Power Facilities
DL/T 722 Guidelines for Dissolved Gas Analysis and Judgment in Transformer Oil
3.Terms and Definitions
The terms and definitions defined in GB/T 2900.95 and GB/T 10230.1-2019 apply to this document.
4.Basic Requirements
4.1 Environmental Requirements
4.1.1 The operating temperature range for on-load tap changers in transformer oil is -25℃ to 105℃, and the ambient temperature range is -25℃~
40℃. The operating temperature range for the no-load tap changer in transformer oil is -40℃ to 105℃, and the ambient temperature range is -40℃.
40℃.
4.1.2 The electric mechanism should be able to operate normally under outdoor condensation and precipitation conditions.
4.1.3 The sunlight radiation in the operating environment of the tap changer shall comply with the relevant provisions of GB/T 4797.4.
4.1.4 The seismic fortification intensity of the tap changer should be consistent with that of its corresponding transformer.
4.2 Usage Requirements
4.2.1 The tap changer is installed in the voltage regulating and compensation transformer of the UHV step-up transformer or UHV autotransformer, with an inclination of [insert angle here] relative to the ground.
It should not exceed 2%.
4.2.2 The tap changer can adopt the neutral point forward and reverse voltage adjustment method. The contact arrangement is shown in Appendix A.
4.2.3 The tap changer should have both manual and electric adjustment functions.
4.2.4 Tap changers installed after the voltage regulating compensation transformer of UHV step-up transformers or UHV autotransformers are non-excitation tap changers.
The deviation between the resistance value of the transformer and the design value should not exceed 2%, and the on-load tap changer and transformer should not malfunction during operation.
4.3 Special Requirements
Other special environmental and usage requirements should be specified when ordering.
5.Parameter Requirements
5.1 Parameters of tap changers for UHV autotransformers
The parameters of the tap changer for the UHV autotransformer should meet the requirements of Table 1.
Table 1.Parameter Table of Tap Changers for UHV Autotransformers
Serial Number Parameter Unit No-load tap changer characteristic value On-load tap changer characteristic value
1.Voltage regulation position - Neutral point
2 phases - Single-phase
3.Maximum rated current Irm A 2400.2000
4 Rated voltage kV - ≥4
5 Rated frequency (Hz) 50 50
6.Maximum voltage of the equipment Um kV 126 126
7 Rated insulation level
Rated withstand test voltage (square)
Root value)
kV 230 230
Lightning full-wave impulse voltage (peak value) kV 550 550
8.Voltage regulation range (kV). 525/3±4×1.25% 525/3±10×0.5%
9.Short-circuit current withstand capability
Thermal stability current (RMS value)
(3s)
kA 30 24
Dynamic steady-state current (peak value) (0.25s) kA 75 60
10 Mechanical lifespan. 20,000 to 800,000 cycles
11 Electrical lifespan -.200,000 cycles
12.Conditions for core lifting maintenance - -
Running for more than 6 years or
More than 100,000 repetitions
13 Partial discharge pC 10 10
14.Temperature rise limit K in contact oil under temperature rise test current 15 15
Note. "-" indicates no content.
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