低压线路接触不良放电的试验研究  

Experimental Study on Contact Undesirable Discharge of Low Voltage Line

作　　者：王成江[1] 胡帅[1] 李如锋[1] 周阳 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]湖南省电网工程公司,湖南衡阳421000

出　　处：《电测与仪表》2014年第15期55-59,共5页Electrical Measurement & Instrumentation

摘　　要：为了研究220V 低压线路接触不良放电的一般规律，系统的开展了低压线路接触不良放电的模拟试验。在大量试验的基础上，总结了低压线路接触不良放电的一般规律：相线和中性线接触不良放电时相线电压波形存在相同的放电多发区域，该区域的放电次数均达到最大放电次数的70％，相位区间分别为0°～20°、40°～80°、100°～140°、160°～200°、220°～260°、280°～320°、340°～360°。该相位分布规律不随接触类型、间隙大小、负荷类型和负荷大小的改变而出现偏移或缺失；在电流增大到一定值，接触不良放电的平均放电量随不良接触面积和间隙的增大而线性增大且值均大于25pC；最后由 ANSYS 仿真结果分析了低压接触不良放电影响因素的放电机理。To study the law of discharge for contact failure of 220V low voltage line, a series of simulation experiments are carried out in the paper.Based on the results, the general law of discharge is summarized , which shows that same frequent discharge regions exist in phase voltage waveforms when the discharge happens due to poor contact of phase line and neutral line.The number of discharge reaches 70% of the maximum number of discharge.The phase regions are 0°~20°、40°~80°、100°~140°、160°~200°、220°~260°、280°~320°、340°~360°, and the phase distribution law does not change with contact type , gap size, load category and load size.When the current increases to a certain value, the average discharge magnitude of poor contact linearly increases with gap size and contact area , and the value is greater than 25 pC.Finally, analysis on the discharge mechanism of poor contact and the factors affecting the poor contact discharge are given with ANSYS simulation results .

关 键 词：低压线路 接触不良 模拟试验 放电 

分 类 号：TM726[电气工程—电力系统及自动化]