针板缺陷位形下局部放电击穿特性实验教学研究

Experimental teaching research on breakdown characteristics of partial discharge under defect configuration of needle-plate

电介质的局部放电现象是输电线路和配电系统故障检测的重要内容,也是电气工程专业高电压技术课程教学的难点和重点。为了让学生对这一问题有更加形象具体的理解,文章在大气压下使用针板缺陷放电装置和高压脉冲电源进行了针板放电实验教学。通过改变针板间隙距离并使用逐步升压法来测量分析空气间隙的击穿特性,并通过建立针板仿真模型计算不同间距针板间隙被击穿时的电场强度,得出最大电场强度与针板间距的关系曲线。进而与Mason公式的理论计算值进行了比较和分析,验证了Mason公式的有效性,增强了学生的动手实践能力和数值模拟仿真能力。

Partial discharge phenomenon of dielectric is an important content of fault detection of transmission line and distribution system,and it is also the difficulty and focus of high voltage technology course teaching for electrical engineering specialty.In order to enable students to have a more vivid and specific understanding of this problem,this paper uses the needle plate defect discharge device and high voltage pulse power supply to carry out the experimental teaching of needle plate discharge under atmospheric pressure.The breakdown characteristics of air gap are measured and analyzed by changing the distance between the needle plate gap and using the step-by-step boosting method.The electric field strength of the needle plate gap with different spacing is calculated by establishing the needle plate simulation model,and the relationship curve between the maximum electric field strength and the needle plate spacing is obtained.Furthermore,the comparison and analysis with the theoretical value of Mason formula verify the effectiveness of Mason formula and enhance students’practical ability and numerical simulation ability.