封闭容器内部短路燃弧特性及电弧电压计算  

Internal arcing characteristic and arc voltage calculation in closed container

作　　者：欧阳子卿 杜志叶[1] 黎鹏[1] 张力[1] OUYANG Ziqing, DU Zhiye, LI Peng,ZHANG Li(School of Electrical Engineering,Wuhan University ,Wuhan 430072, China)

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《电力自动化设备》2018年第11期155-161,共7页Electric Power Automation Equipment

摘　　要：为了准确计算金属封闭开关设备发生短路燃弧时产生的能量,通过开展小尺寸封闭容器内部短路燃弧试验,利用L-C振荡试验回路获得不同充电电压和间隙距离下的电弧电压和电流等数据,详细分析了封闭容器内部燃弧特性,结果表明:封闭环境中电弧电压与压强成正比;电弧电压有效值随电流变化具有较大的不确定性,间隙距离对电弧电压的影响更为明显,当间隙距离为5、10和15 cm时,电弧电压有效值的平均值分别为130.4、208.0、252.2 V。同时考虑到封闭环境中的电弧电压随机性较大,提出了一种基于支持向量机的电弧电压计算方法,并与基于Mayr电弧模型的计算结果及试验结果进行了对比,对比结果证明所提方法优于Mayr电弧模型,计算结果与试验测量值的平均绝对百分比误差仅为4.04%。In order to accurately calculate the energy when the short circuit arcing occurs in metal-enclosed switchgear,the internal short circuit arcing test in a small-scale closed container is carried out. The measured data,such as current and arc voltage under different gap lengths and charging voltages,are obtained by the L-C oscillation test circuit,and the combustion characteristics of internal arc are analyzed. The analytical results show the arc voltage is proportional to the pressure inside the closed surrounding,arc voltage RMS has larger randomness with the change of arc current,the impact of electrode gap length on arc voltage is more obvious,and the average of arc voltage RMS is130.4 V,208.0 V and 252.2 V when the electrode gap length is 5 cm,10 cm and 15 cm respectively. Considering the randomness of the arc voltage in the closed surrounding,a calculation method of arc voltage based on the SVM（ Support Vector Machine） is proposed. The results calculated by the proposed method are compared with the calculation and experimental results based on the Mayr arc model,which shows that the proposed method is superior to the Mayr arc model,and the average absolute percentage error between the results calculated by the proposed method and the testing results is only 4.04%.

关 键 词：电弧电压 金属封闭开关设备 短路燃弧特性 小尺寸封闭容器 支持向量机 Mayr电弧模型 

分 类 号：TM501.2[电气工程—电器]