摘要
直流输电电压中除包含直流电压以外,还存在大量的高次谐波分量,文章通过分析运行中的直流绝缘子的电场成分研究了直流绝缘子的直流电场和谐波电场的分布特点,讨论了应用直流电场法和谐波电场法在线检测直流绝缘子的可行性,谐波(直流)电场法就是利用运行中直流绝缘子串中的谐波(直流)分量电场在线检测直流绝缘子。理论分析与试验结果表明谐波电场分布较为稳定,它能够有效检测出零值瓷绝缘子和合成绝缘子的内绝缘故障,是一种在线检测直流绝缘子的可行方法。
Except DC voltage, there are a lot of high-order harmonic components in DC transmission voltage. By means of analyzing the constituents of electric field of DC insulators being operated, the distribution characteristics of DC and harmonic electric fields of DC insulators are researched. The feasibility of on-line detection of DC insulators by use of DC electric field method and harmonic electric field method is discussed. The harmonic (DC) electric field methods are the very methods that detect the DC insulators in on-line mode by use of the harmonic (DC) component electric fields of DC insulator string being operated. Theoretical analysis and test results show that the distribution of harmonic electric filed is more stable, by which the inner insulation failures of composite insulators and zero-value porcelain insulators can be effectively detected, so harmonic electric field method is a feasible on-line method to detect DC insulators.
出处
《电网技术》
EI
CSCD
北大核心
2005年第4期36-40,共5页
Power System Technology
基金
国家自然科学基金资助项目(90210015)~~
关键词
直流绝缘子
在线检测
电场法
可行性研究
输电线路
Electric fields
Electric insulators
Electric potential
Electric power distribution
Harmonic analysis
Online systems
