Research on Key Technologies of 816 kV HVDC Disconnector Under Extreme Environmental Conditions

WANG Qiaohong; YAO Canjiang; SUN Longyong; LI Jing; WEI Xinjing; LI Yupeng

doi:10.13296/j.1001-1609.hva.2026.10.005

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Research on Key Technologies of 816 kV HVDC Disconnector Under Extreme Environmental Conditions

Research & Analysis | 更新时间：2026-10-14

- Research on Key Technologies of 816 kV HVDC Disconnector Under Extreme Environmental Conditions
- High Voltage Apparatus Vol. 62, Issue 10, Pages: 41-49(2026)
- 作者机构：
  
  河南平高电气股份有限公司，河南平顶山 467001
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.10.005
  CLC：
- Received：20 May 2026，
  
  Revised：2026-07-25，
  
  Published：16 October 2026
- 稿件说明：
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WANG Qiaohong, YAO Canjiang, SUN Longyong, et al. Research on Key Technologies of 816 kV HVDC Disconnector Under Extreme Environmental Conditions[J]. High Voltage Apparatus, 2026, 62(10): 41-49.
DOI：

WANG Qiaohong, YAO Canjiang, SUN Longyong, et al. Research on Key Technologies of 816 kV HVDC Disconnector Under Extreme Environmental Conditions[J]. High Voltage Apparatus, 2026, 62(10): 41-49. DOI： 10.13296/j.1001-1609.hva.2026.10.005.

摘要

816 kV直流隔离开关是±800 kV特高压直流输电工程换流站的关键设备，其优异的绝缘性能与良好的机械可靠性直接影响系统安全运行。针对4 500 m超高海拔与-60℃极端低温环境，文中开展了隔离开关触头耐磨特性与绝缘性能的系统研究。通过分析温度与镀银层磨损量、接触电阻的影响规律，揭示了低温环境下接触电阻的演化机理，并据此优化了触头结构。采用APDL命令流方法对隔离开关进行参数化建模与电场仿真，分析了支架高度、均压环尺寸、断口间隙等关键参数对电场强度的影响规律，确定了适用于4 500 m海拔条件的最优屏蔽结构。在此基础上，研制了816 kV直流隔离开关样机，并完成了4 500 m海拔条件下的绝缘试验验证。结果表明，所研制产品满足高海拔地区工程应用要求，具备良好的绝缘性能与运行可靠性。研究结果为极端环境下高压直流隔离开关的设计提供了理论依据与数据支撑。

Abstract

816 kV DC disconnector is a critical component in ±800 kV UHVDC converter stations

and its excellent insulation performance and reliable mechanical operation directly contribute to the safe operation of the system. Aiming at the extremely high altitude of 4500 m and the extreme low temperature of-60℃

in this paper a systematic study on the wear resistance characteristics of the disconnector contacts and its insulation performance is carried out. By analyzing the influence of temperature on the wear amount of the silver coating layer and on the contact resistance

the evolution mechanism of contact resistance under low-temperature environments is revealed and

on this basis

the contact structure is optimized. The APDL command flow method is used for parametric modeling and electric field simulation of the disconnector. The influence of such key parameters as support height

grading ring dimensionsand distance across open contacts on electric field intensity is analyzed

and the optimal shielding structure suitable for 4500 maltitude conditions is determined. Based on these findings

a prototype of the 816 kV DC disconnector is developed and subjected to insulation tests at 4500 m altitude conditions. The results demonstrate that the developed product meets the engineering application requirements for high-altitude regions and exhibits excellent insulation performance and operational reliability. The research result can provide a theoretical basis and data support for the design of HVDC disconnector in extreme environments.

关键词

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references

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