基于迁移管法气压对氮气正电晕放电离子迁移率的影响

发布时间：2018-03-26 08:12

本文选题：电晕放电　切入点：离子迁移率　出处：《电工技术学报》2016年22期

【摘要】：低气压下离子迁移率是高海拔地区输电线路导线电晕放电的关键参数之一,同时氮气作为正电晕放电参与反应的主要气体,目前均作为常量对待,其测量结果对于建立考虑海拔因素的离子流、电晕损失等计算模型具有重要意义,因此对不同气压下氮气正离子迁移率的测量显得尤为重要。在已有研究的基础上,自主设计了可模拟不同氮气气压条件下离子迁移率测量平台,并将离子门的动作方式由关闭—导通—关闭改进为关闭—导通,从而得到幅值尽可能大的离子流波形。利用此平台测量得到大气条件下纯氮气环境离子的迁移率为1.113cm2V-1S-1,并通过试验研究了气压在101.19~44.52k Pa范围内氮气环境离子迁移率变化情况,研究发现氮气正离子迁移率随气压增大呈非线性减小且具有一定的饱和趋势,最后提出了一种氮气正离子迁移率随气压变化的指数修正方法。
[Abstract]:Ion mobility is one of the key parameters of corona discharge of transmission line conductors in high altitude area under low pressure. Nitrogen, as the main gas in the reaction of positive corona discharge, is treated as a constant at present. The measured results are of great significance to the establishment of ion current and corona loss models, so it is very important to measure the mobility of nitrogen positive ions at different atmospheric pressure. An ion mobility measurement platform was designed to simulate the ion mobility under different nitrogen pressure, and the action mode of the ion gate was improved from closing-on-closing to closing-conducting. By using this platform, the ion mobility of pure nitrogen is 1.113cm2V-1S-1, and the variation of ion mobility in nitrogen environment in the range of 101.19 ~ 44.52kPa is studied by experiments. It is found that the nitrogen positive ion mobility decreases nonlinearly with the increase of atmospheric pressure and has a certain saturation trend. Finally, an exponential correction method of nitrogen positive ion mobility with air pressure is proposed.
【作者单位】：华北电力大学河北省输变电设备安全防御重点实验室;国网长春供电公司;国网南京供电公司;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209401) 国家自然科学基金(51277073、51577069)资助项目
【分类号】：TM75

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