火焰条件下间隙的直流电压击穿特性研究

发布时间：2018-05-09 06:28

本文选题：直流电压 + 输电线路　；参考：《中国电机工程学报》2014年03期

【摘要】：近年来,多条特高压直流线路建成投运,还有多条直流输电线路正在规划,山火严重威胁到输电线路的绝缘安全和可靠运行,研究火焰条件下间隙的直流电压击穿特性和放电机理具有重要意义,但国内外在山火条件下间隙直流电压击穿特性方面的研究较少。间隙在山火条件下击穿机理涉及火焰温度、电导率和灰烬等个因素,不同植被的燃烧特性决定了这3种因素触发放电的影响程度不同,因而击穿电压存在较大的差异。文中研究典型植被的火焰特性,利用模拟山火对不同影响因素条件下的导线?板间隙直流电压放电特性进行试验研究,分析了山火条件下间隙击穿机理。研究发现间隙在火焰中绝缘强度下降到纯空气的20%左右,直流电压下间隙的击穿存在明显的极性效应。
[Abstract]:In recent years, many UHV DC lines have been built and put into operation, and many HVDC transmission lines are under planning. Mountain fires seriously threaten the insulation safety and reliable operation of transmission lines. It is of great significance to study the DC voltage breakdown characteristics and the discharge mechanism of the gap under the flame condition, but there are few researches on the DC voltage breakdown characteristics of the gap under the condition of hill fire at home and abroad. The breakdown mechanism of gap under the condition of hill fire involves the factors such as flame temperature, electrical conductivity and ash. The combustion characteristics of different vegetation determine the influence degree of these three factors to trigger discharge, so there are great differences in breakdown voltage. In this paper, the flame characteristics of typical vegetation are studied, and the conductors under different influence factors of simulated hill fires are used. The characteristics of DC voltage discharge in plate gap are studied experimentally, and the gap breakdown mechanism under hill fire is analyzed. It is found that the insulation strength of the gap in the flame decreases to about 20% of that of pure air, and the gap breakdown under DC voltage has obvious polarity effect.
【作者单位】：武汉大学电气工程学院;特高压工程技术(昆明广州)国家工程实验室;中国电力科学研究院;
【基金】：高等学校博士学科点专项科研基金(20120141120027) 特高压工程技术(昆明,广州)国家工程实验室开放基金资助(NEL201209)~~
【分类号】：TM85

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