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中国电机工程学报 2009, 29(25) 104-110 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 高电压技术 |
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低气压下直流绝缘子串污闪过程中局部电弧发展特性 |
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张志劲，蒋兴良，孙才新，胡建林，苑吉河 |
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输配电装备及系统安全与新技术国家重点实验室(重庆大学) |
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摘要：
绝缘子污秽闪络事故严重威胁电力系统的安全可靠运行，目前国内外对污闪机理的研究主要是以平板模型为基础的，而研究污闪机理的关键是研究局部电弧形成后如何发展成完全闪络。开展低气压下绝缘子串直流污闪过程中局部电弧发展研究，结果表明：低气压下绝缘子串直流污闪过程中局部电弧发展中存在飘弧现象，即局部电弧由沿面电弧和空气间隙电弧2部分组成；低气压下局部电弧的发展主要决定于静电力和热浮力，静电力和热浮力随气压变化的规律存在差异，使得低气压下染污绝缘子串局部电弧的飘弧更严重；低气压下染污绝缘子串直流污闪过程中局部电弧的发展缓慢，局部电弧发展长度为绝缘子串闪络距离的60%以内时，局部电弧的发展速度小于10 m/s，在最后闪络阶段，局部电弧的发展速度剧增至30~80 m/s，绝缘子串的最终闪络不是电击穿的原因。 |
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关键词：
低气压
直流绝缘子串
污闪过程
局部电弧
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Propagation of Partial Arc During the DC Pollution Flashover Process for
Insulator String at Low Air Pressure
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ZHANG Zhi-jin, JIANG Xing-liang, SUN Cai-xin, HU Jian-lin, YUAN Ji-he |
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State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University) |
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Abstract:
Pollution flashover accidents of insulators may threaten the operation safety of power system. The key of the research on pollution mechanism is how the partial arc propagates to flashover, and it has been based on plate model by now. The propagation of partial arc under low air pressure during the DC pollution flashover process of insulator is researched. The results suggest that some of the partial arcs may deviate from the surface of polluted insulator string and form the air gap arc during the pollution flashover process. The partial arcs include two main parts: air gap arcs and surface arcs during the flashover process for the polluted insulator string. It was found that the propagation of partial arc depends on the electrostatic force and thermal buoyant force under low air pressure and the difference between influences of air pressure on electrostatic force and thermal buoyant force makes the partial arc deviate from the surface of insulator more severely at high altitude. When the length of partial arc is in 60 percent of the total leakage distance, the propagation speed of partial arc is slow which is in 10 m/s and may reach 30~80 m/s at the end of flashover stage during the pollution flashover process at low air pressure, so the main reason leading to pollution insulator flashover at last is not electric breakdown. |
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Keywords:
low air pressure
DC insulator string
pollution flashover process
partial arc
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收稿日期 2008-04-25 修回日期 2008-06-27 网络版发布日期 2009-09-22 |
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DOI: |
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基金项目:
国家重点基础研究发展计划项目(973 项目)(2009CB724503)；国家自然科学基金重大研究计划项目(90210026)。 |
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通讯作者: 张志劲 |
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作者简介: |
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作者Email: |
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| 本刊中的类似文章 |
| 1．司马文霞 冯杰 杨庆 赖向平 余德芬 M. Farzaneh 张建辉.低气压下直流正极性冰电极电晕特性研究[J]. 中国电机工程学报, 2007,27(27): 13-18 |
| 2．张志劲 蒋兴良 孙才新 舒立春 苑吉河 王波.低气压下特高压直流污秽复合绝缘子覆冰闪络特性[J]. 中国电机工程学报, 2008,28(6): 7-12 |
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| Copyright by 中国电机工程学报 |
