电气工程学报 ›› 2019, Vol. 14 ›› Issue (1): 26-29.doi: 10.11985/2019.01.005

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高压直流输电均压电极结垢的解析与改进 *

李道豫1,王圣平2,冯文昕1,周培1,吕刚1   

  1. 1. 中国南方电网有限责任公司超高压输电公司贵阳局 贵阳 550081
    2. 中国地质大学(武汉)材料与化学学院 武汉 430074
  • 收稿日期:2018-11-24 出版日期:2019-03-25 发布日期:2019-11-01
  • 作者简介:李道豫,男,1983年生,高级工程师,从事高压直流输电技术工作。Email: 36920089@qq.com|王圣平,男,1972年生,教授,博士生导师,研究方向为材料的电化学腐蚀、结垢和老化,以及电化学储能。Email: spwang@cug.edu.cn
  • 基金资助:
    *中国南方电网公司科技项目资助(CGYKJXM20160094)

Analysis and Improvement for Scaling of Grading Electrodes in HVDC

LI Daoyu1,WANG Shengping2,FENG Wenxin1,ZHOU Pei1,LV Gang1   

  1. 1. CSG EHV Power Transmission Company Guiyang Bureau, Guiyang 550081 China
    2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074 China
  • Received:2018-11-24 Online:2019-03-25 Published:2019-11-01

摘要:

高压直流输电工程内冷水系统铂均压电极的结垢和铝散热器的腐蚀,严重影响输电的正常运行。为解决这一难题,根据一个阀段内均压电极、散热器的相对位置构建了部分电容模型,分析了腐蚀溶解、结垢等过程的行为特征,阐明了现场不同运行工况下的均压电极结垢、散热器腐蚀的成因和影响机制,得出降低均压电极表面Al 3+浓度是解决结垢难题的根源。结合实际生产提出了减缓均压电极结垢、散热器腐蚀的技术改造思路,对提升高压直流输电工程阀冷系统运行的可靠性具有指导意义。

关键词: 均压电极, 结垢, 散热器, 腐蚀, 高压直流输电

Abstract:

The scaling of the platinum grading electrode and the corrosion of the aluminum heat sinks in high voltage direct current (HVDC) seriously affect the normal operation. In order to solve these problems, a partial capacitance model is firstly built based on the relative position of the grading electrodes and the heat sinks in a valve section, and the primary cause for the scaling of the grading electrodes and the corrosion of the heat sinks under different operating conditions are clarified. The influence mechanism of the behavioral characteristics of processes are explained. On this basis, some improved technologies to reduce the scaling and the corrosion are given, and the purpose of improving the operational reliability of the valve cooling system in HVDC is achieved.

Key words: Grading electrodes, scaling, heat sinks, corrosion, high voltage direct current

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