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Direct current deicers - Part 2: Converters
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Direct current de-icing devices -- Part 2: Thyristor valves
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Basic data
| Standard ID | GB/T 31487.2-2025 (GB/T31487.2-2025) |
| Description (Translated English) | Direct current deicers - Part 2: Converters |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | K46 |
| Classification of International Standard | 29.240.99 |
| Word Count Estimation | 46,499 |
| Date of Issue | 2025-12-31 |
| Date of Implementation | 2026-07-01 |
| Older Standard (superseded by this standard) | GB/T 31487.2-2015 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 31487.2-2025: Direct current deicers - Part 2: Converters
---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 29.240.99
CCSK46
National Standards of the People's Republic of China
Replaces GB/T 31487.2-2015
DC ice melting device, Part 2.Converter
Published on 2025-12-31
Implemented on July 1, 2026
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of contents
Preface III
Introduction V
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Types of converters 3.
4.1 General Rules 3
4.2 Grid-commutated converter 3
4.3 Modular Multilevel Converter 3
5.Technical Requirements 3
5.1 Normal operating conditions 3
5.2 Load 3
5.3 Overall Performance Requirements 4
5.4 Performance of Grid-Commutated Converters 4
5.5 Performance of Modular Multilevel Converters 7
6.Inspection Rule 10
6.1 General Rules 10
6.2 Test of thyristor valve 10
6.3 Experiments on Modular Multilevel Converter Valves 12
6.4 Testing of Bridge Arm Reactors 14
6.5 Water cooling equipment test 15
7 Packaging, Transportation and Storage 16
7.1 Packaging 16
7.2 Transportation 17
7.3 Storage 17
Appendix A (Informative) Converter Topology of DC Ice Melting Device 18
A.1 6-pulse grid phase converter 18
A.2 12-pulse grid commutator 18
A.3 Thyristor stage of grid-connected phase converter 19
A.4 Modular Multilevel Converter 19
A.5 Submodule 20 of the modular multilevel converter
A.6 Other types of DC ice melting device converter topology 20
Appendix B (Informative) Electrical and Cooling Design of Thyristor Valves 23
B.1 Electrical Design Methods for Thyristor Valves 23
B.2 Electrical Design Example 26 for Thyristor Valves
B.3 Thyristor Valve Cooling Design Method 28
B.4 Thyristor Valve Cooling Design Example 28
Appendix C (Informative) Electrical and Cooling Design of Modular Multilevel Converter Valves 30
C.1 Modular Multilevel Converter Valve Electrical Design Method 30
C.2 Example 32 of Electrical Design for Modular Multilevel Converter Valves
C.3 Modular Multilevel Converter Valve Cooling Design Method 34
C.4 Modular Multilevel Converter Valve Cooling Design Example 35
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.
This document is Part 2 of GB/T 31487 "DC De-icing Devices". GB/T 31487 has already published the following parts.
---Part 1.System Design;
---Part 2.Converter;
---Part 3.Experiment.
This document replaces GB/T 31487.2-2015 "DC De-icing Devices - Part 2.Thyristor Valves" and is consistent with GB/T 31487.2-2015.
In comparison, aside from structural adjustments and editorial changes, the main technical changes are as follows.
---The scope has been changed (see Chapter 1, Chapter 1 of the.2015 edition);
---Terms changed to "valve", "thyristor valve", "valve-based electronic equipment", "large angle high current operation", "rated DC voltage", "rated DC voltage".
Definition of "current" (see 3.1, 3.2, 3.6, 3.8, 3.10 and 3.11, and 3.1, 3.2, 3.7, 3.17, 3.13 and 3.9 in the.2015 edition);
---The terms "modular multilevel converter valve" and "ideal no-load DC voltage" have been added (see 3.3 and 3.9);
The terms "converter," "single valve," "maximum DC current," "2h overload DC current," and "maximum ideal no-load DC voltage" have been removed.
"Current sharing coefficient", "rated junction temperature", and "zero power test" (see sections 3.3, 3.4, 3.10~3.12, 3.15, 3.16 and 3.18 in the.2015 edition);
---Added "Types of Converters" (see Chapter 4);
---Change "Environmental conditions" to "Normal operating conditions" (see 5.1, 4.1 in the.2015 edition);
---The section "Access System" has been removed (see section 4.2 of the.2015 version);
---The definition regarding "load" has been changed (see 5.2, 4.3 in the.2015 version);
---The "Output DC Voltage Requirements" have been changed (see 5.3.2, 4.4.3 in the.2015 version);
---The following requirements have been removed. "Discontinuous output current requirement," "Requirement for large-angle, high-current operation," and "Requirement for operation in static var compensation mode."
(See 4.4.4~4.4.6 in the.2015 edition);
---The sections "Electrical Connection Types of Thyristor Valves" and "Design of Thyristor Valves" have been removed (see Chapters 5 and 6 of the.2015 edition).
---Added "Performance of Grid-Commutated Converters" and "Performance of Modular Multilevel Converters" (see 5.4 and 5.5);
---Change "trials" to "inspection rules" (see Chapter 6, Chapter 7 of the.2015 edition);
---Change "Type testing and routine testing" and "Field testing" to "Testing of thyristor valves" (see 6.2, see 7.2 in the.2015 edition).
and 7.3);
---Added tests on "Modular Multilevel Converter Valves", "Bridge Arm Reactors", and "Water Cooling Equipment" (see 6.3~6.5);
---Added "Packaging, Transportation and Storage" (see Chapter 7);
---The "Calculation Method for Losses of Thyristor Valves" has been deleted (see Appendix A of the.2015 edition).
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 Electrical Equipment Industry Association.
This document is under the jurisdiction of the National Technical Committee on Standardization of Power Electronic Systems and Equipment (SAC/TC60).
This document was drafted by. Guizhou Power Grid Co., Ltd. Electric Power Research Institute and China Southern Power Grid Research Institute Co., Ltd.
Xi'an High Voltage Apparatus Research Institute Co., Ltd., China Electric Power Planning & Engineering Institute Co., Ltd., Xi'an Power Electronics Technology Research Institute Co., Ltd., China
China Southern Power Grid Co., Ltd., China Energy Engineering Group Yunnan Electric Power Design Institute Co., Ltd., China Southern Power Grid Co., Ltd.
Ultra-high voltage power transmission company, Nanjing NARI Relay Protection & Automation Co., Ltd., Beijing Sifang Relay Protection & Automation Co., Ltd., China Electric Power Research & Development Co., Ltd.
The company, China Energy Engineering Group Nanjing Line Equipment Co., Ltd., China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd.
China Southern Power Grid New Power System (Beijing) Research Institute Co., Ltd., Guangzhou Gaolan Energy Saving Technology Co., Ltd., and XJ Electric Co., Ltd.
Company, Henan Jingrui Cooling Technology Co., Ltd., Xi'an Xi'an Electric Power System Co., Ltd., Guangdong Power Grid Co., Ltd. Electric Power Research Institute
Research Institute, State Grid Zhejiang Electric Power Research Institute, Yunnan Power Grid Co., Ltd. Electric Power Research Institute, China Electric Power Engineering
Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Central South Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, and China Electric Power Research Institute
Research Institute Co., Ltd., China Southern Power Grid Energy Development Research Institute Co., Ltd., China Huaneng Group Clean Energy Technology Research Institute Co., Ltd.
Company, Fuzhou University, Tsinghua Sichuan Energy Internet Research Institute, State Grid Sichuan Electric Power Research Institute, Guangdong Fude Electronics Co., Ltd.
Company, Southwest Jiaotong University, State Grid Fujian Electric Power Research Institute, State Grid Shanxi Electric Power Research Institute
Guangdong Power Grid Co., Ltd., State Grid Jiangxi Electric Power Research Institute, Tianjin University, Harbin Institute of Technology, North China Electric Power Research Institute
Hunan University of Technology, Hunan Changgao High Voltage Switchgear Co., Ltd., Mingzhu Electric Co., Ltd., Hunan Fude Electric Co., Ltd., TBEA Hengyang Transformer Co., Ltd.
Limited Liability Company, Xi'an Xidian Surge Arrester Co., Ltd.
The main drafters of this document are. Zhou Yuebin, Li Huan, Yang Xiaohui, Mao Xianyin, Fu Chuang, Zhou Huigao, Wei Wei, Xu Fan, Wang Jieqing, and Wei Hongqi.
Xin Qingming, Lei Ming, Xu Dizhen, Feng Junjie, Li Lingfei, Hou Ting, Dai Shulong, Zeng Huarong, Huang Chao, Chen Yukun, Ren Menggan, Zou Changyue, Zhao Xiaobin
Wang Zehao, Fan Lingmeng, Li Ying, Zhang Juanjuan, Chen Ming, Tang Jinkun, Qin Kang, Li Hao, Zhang Qiang, Xi Xinze, Chen Yijing, Li Chunhua, Li Yang, Hong Quanwei
Dong Tianhua, Tian Jie, Li Bin, Xu Jianzhong, He Jiawei, He Jinwei, Liu Tao, Xu Shukai, Fang Hongwei, Wu Yue, Yang Liu, Xiong Yan, Wan Qifa, Yang Yong
Li Qi, Wang Liping, Yang Youtian, Meng Xuelei, Xu Wangsheng, Yang Qi, Ban Guobang, Zhong Yao, Zhang Jianping, Liao Mingyang, Wang Xiaoling, Li Binbin, Huang Xin
Liao Hanqing, Liu Xiang, Zhou Chentao, Xie Huifan, Li Jingliang, Deng Wenhua, Liang Ning, Li Chao, Wang Zhiyuan, Huang Junwei, Yan Hui, Peng Xiangyang, Lin Xutao, Lei Ming,
Ma Xiaohong, Huang Shihua, Rao Binbin, Wang Xiuhuan, Liu Longchen, Liu Fei, Peng Guangqiang, Wu You, Sun Qiang, Qu Lu, Jin Tao, Guo Yujun, Zhang Yining, Zhu Dapeng
Zhang Hongtao, Xu Yabing, He Yan, Guan Shengli, Li Mingtao, Jiang Qingfei.
The release history of this document and the document it replaces is as follows.
---First published in.2015 as GB/T 31487.2-2015;
---This is the first revision.
Introduction
Icing is one of the most serious threats to power grids. Icing on transmission lines is unavoidable, and timely de-icing is an effective means to ensure power grid safety.
Passing current through ice-covered conductors and ground wires to heat and melt the ice is a feasible method to deal with tower collapses and line breaks in transmission lines. The.2008 ice storm caused damage to my country's power grid.
Extensive equipment damage led to widespread power outages. In response, Chinese power technology engineers successfully developed a grid-connected phase-commutator with precise current control.
The company conducted comprehensive research and development on DC de-icing devices, including the design, manufacturing, testing, acceptance, operation, and maintenance of DC de-icing devices for power grid phase commutation.
To ensure that the functional requirements, performance indicators, and testing methods of DC ice-melting devices are consistently followed in design, production, and use, a common standard must be established.
According to reports, my country has established a standard system for the technical conditions of DC ice-melting devices. More than 10 years of practical application of this series of standards has shown that timely implementation of DC...
Melting ice plays a vital role in protecting transmission lines and towers from damage, reducing line tripping, and ensuring system safety. It effectively reduces...
Damage to power grid equipment caused by freezing can be mitigated by avoiding widespread line breaks and tower collapses, and significantly reducing the cost of power grid construction. In recent years, with the development of new-generation...
Grid-friendly DC de-icing device – Modular multilevel DC de-icing device, transmission line overhead ground wire and fiber optic composite overhead ground wire de-icing
Successful research and development and promotion of ice technology, uninterrupted power transmission line ground wire de-icing technology, and switchgear for rapid connection of iced conductors and ground wires to de-icing power supply.
To facilitate wider application, it is necessary to integrate the innovative achievements of DC ice melting technology into technical standards, further improve the level of DC ice melting technology standards, and revise the relevant regulations.
GB/T 31487 "DC De-icing Devices". Due to space limitations and varying user needs, GB/T 31487 consists of three parts.
---Part 1.System Design. The purpose is to clarify the system design, inspection, operation, and maintenance requirements of the DC de-icing device.
---Part 2.Converters. The purpose is to clarify the grid-commutated converters and modular multilevel converters in DC de-icing devices.
Technical requirements.
---Part 3.Experimentation. The purpose is to clarify the experimental methods for the DC de-icing device.
This revision of GB/T 31487 mainly adds modular multilevel DC de-icing devices, overhead ground wires for transmission lines, and optical fiber...
Design of equipment for de-icing overhead ground wires, de-icing of transmission line ground wires without power interruption, and quick connection of iced conductors and ground wires to de-icing power supply, etc.
Inspection rules and test methods.
DC ice melting device, Part 2.Converter
1 Scope
This document specifies the converter types, technical requirements, inspection rules, packaging, transportation, and storage requirements for DC de-icing devices.
This document applies to the de-icing of conductors and ground wires of 110kV and above AC transmission lines, and the de-icing of ground wires of DC transmission lines, for grid phase-change DC transmission.
The de-icing device and the modular multi-level DC de-icing device are used as references for other types of DC de-icing devices.
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 corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 1094.1-2013 Power Transformers - Part 1.General Provisions
GB/T 13384 General Technical Requirements for Packaging of Mechanical and Electrical Products
GB/T 13498 Terminology for High Voltage Direct Current Transmission
GB/T 17702 Power Electronic Capacitors
GB/T 20989 Determination of losses in high-voltage direct current converter stations
GB/T 20990.1-2020 High Voltage Direct Current Transmission Thyristor Valves - Part 1.Electrical Testing
GB/T 30425-2025 Water-cooled equipment for converter valves in high-voltage direct current transmission
GB/T 31487.1 DC De-icing Device - Part 1.System Design
GB/T 31487.3-2025 DC De-icing Devices - Part 3.Testing
GB/T 33348-2024 Electrical testing of valves in voltage source converters for high voltage direct current transmission
GB/T 34118 Terminology for Voltage Source Converters for High Voltage Direct Current Systems
GB/T 35702.1 Valve losses of voltage source converters for high voltage DC systems - Part 1.General requirements
GB/T 35702.2 Valve Losses of Voltage Source Converters for High Voltage Direct Current Systems - Part 2.Modular Multilevel Converters
3 Terms and Definitions
The terms and definitions defined in GB/T 13498, GB/T 31487.1 and GB/T 34118, as well as the following terms and definitions, apply to this document.
3.1
valve
An electrical and mechanical assembly composed of power electronic devices and auxiliary components, capable of unidirectional or bidirectional conduction, and capable of facilitating converter arms.
Function.
Note. Commonly used valves in DC de-icing devices include thyristor valves and modular multilevel converter valves.
[Source. GB/T 31487.1-2025, 3.2.1]
3.2
thyristor valve
A complete electronic switching device that uses thyristors to achieve controllable operation, normally conducting only in one direction (forward), in the converter bridge.
In the middle, it can realize the function of the converter arm.
...
