电晕笼中绞线正直流起晕电压的仿真研究  

Numerical Research on Positive DC Corona Inception Voltage of Stranded Conductors in the Corona Cage

作　　者：徐海瑞[1] 王力[1] 曹亚旭[1] 詹铸[1] 赵广立[1] 张伟[1] 

机构地区：[1]郑州供电公司,河南郑州450052

出　　处：《河南电力》2013年第1期29-32,共4页Henan Electric Power

摘　　要：电晕放电是输电线路设计和运行中面临的重要问题之一。输电线路跨越高海拔地区,由于海拔高度升高、气压降低,将给输电线路的设计和运行带来很多特殊问题。因此研究气压对输电线路导线电晕特性、放电机理具有重要的学术意义和工程应用价值。本文利用气体放电理论建立电晕笼中导线电晕起始电压放电模型,计算导线的电晕特性。计算模型采用模拟电荷法计算空间电场分布,然后根据二次电子崩正离子数大于等于一次电子崩正离子数目的起晕电压判据计算出导线起晕电压。计算结果与不同海拔高度下电晕特性试验进行了对比,四个海拔地点分别为:武汉(23m),西宁(2250m);格尔木(2829m)和青海(3800m)。电晕起始电压随气压下降,每0.01MP下降标准气压下电晕起始电压的9%,主要原因是有效电离系数增大导致的电离区域的扩大。The corona discharge effect is one of important problems in the design and operation of transmission lines.The transmission lines pass by the high altitude region with low air pressure, which brings many special problems to the design and operation of the transmission lines.Consequently,it is significant to study the impact of air pressure on the corona characteristics and discharge mechanism of transmission lines.A computation model is adopted for evaluating the corona inception voltages of conductors in the corona cage.The charge simulation method is introduced to the computation model to calculate the electric field intensity.Then the positive corona inception voltages are calculated according to the positive corona criterion.The computation results of positive corona inception voltages are compared with experimental results for several kinds of DC conductors based on the mobile corona cage in four altitudes ,Wuhan 23m, Xining 2250m,Geermu 2829m and Nachitai 3800re.The influence of air pressure on the corona inception voltage of conductors is analysed systematically.Corona inception voltage decreases as air pressure is lowered.The corona inception voltage may decrease by 9% per 0.01MPa bases on the standard atmospheric pressure,which is mainly due to the enlargement of ionization zone as a result of the increase of effective ionization coefficient.

关 键 词：正直流 气晕电压 气压 电晕笼 绞线 

分 类 号：TM726[电气工程—电力系统及自动化]