交流电晕笼电晕特性数值计算分析(Ⅱ)—电晕电流与电晕损失  

Numerical Calculation and Research of Corona Characteristics in AC Corona Cage(Ⅱ)·Corona Current and Corona Loss

作　　者：蓝磊[1] 李威[1,2] 万保权 陈小月 何旺龄[1] 海景雯[4] LAN Lei;LI Wei;WAN Baoquan;CHEN Xiaoyue;HE Wangling;HAI Jingwen(School of Electrical Engineering,Wuhan University,Wuhan 430072,China;State Grid Hunan Electric Power Maintenance Company Limited,Changsha 410009,China;State Key Laboratory of Power Network Environmental Protection,China Electric Power Research Institute,Wuhan 430074,China;State Grid Qinghai Electric Power Company Electric Power Research Institute,Xining 810000,China)

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]国网湖南省电力有限公司检修公司,长沙410009 [3]电网环境保护国家重点实验室(中国电力科学研究院有限公司),武汉430074 [4]国网青海省电力公司电力科学研究院,西宁810000

出　　处：《高电压技术》2018年第10期3291-3298,共8页High Voltage Engineering

基　　金：国家电网公司科技项目(GY71–17–005)~~

摘　　要：电晕损失是采用特高压电晕笼研究导线电晕特性的重要内容。搭建了考虑均压环的电晕笼导线交流离子流场3维计算模型,模型在笼体两侧加入均压环电荷以抑制端部效应,采用基于Shockley-Ramo法则的电晕电流计算方法,以及基于电晕电流工频分量的电晕损失计算方法。采用此模型计算了特高压电晕笼8×LGJ 630导线的交流离子流场,对比分析了均压环对导线表面最大场强沿线分布的影响,证明了均压环能改善端部效应引起的场强过大。而后计算得到大雨条件下8×LGJ 630导线上施加500 kV电压时的电晕电流时域波形,与理论波形规律一致。最后,对电晕电流进行频谱分析,得到了电晕电流工频分量的幅值和相位,并采用功率因素法计算了干燥和大雨条件下、不同交流电压时笼内单位长度导线上的电晕损失,与文献中的试验结果相差≤25W/m,且比2维算法结果有更高的精确度,证明了该方法的适用性。研究结果表明,所建离子流场模型符合物理实际,对电晕笼导线电晕损失的研究具有一定的参考意义。Corona loss is an important part of studying the corona characteristics on the wires of UHV corona cages. We established a three-dimensional calculation model of ion flow field near the corona cage wire after considering the equalizing ring, in whichthe equalizing ring charge was added on both sides of the cage to suppress the end effect. The calculation method of the corona current based on the Shockley-Ramo rule, as well as a corona loss calculation method based on the corona current power frequency component, was adopted. The AC ion flow field near 8×LGJ 630 wire of UHV corona cage was calculated by this model. The influence of the pressure equalization ring on the distribution of the maximum field strength along the wire surface was analyzed, which proved that the pressure equalization ring can improve the excessive field strength caused by the end effect. Then, the time domain waveform of the corona current when the 500 kV voltage was applied to the 8×LGJ 630 wire under heavy rain was calculated, which was consistent with the theoretical waveform law. Finally, the corona current was analyzed by spectrum, and the amplitude and phase of the corona current power frequency component were obtained. The power factor method was used to calculate the corona on the unit length wire in the cage under different dry and heavy rain conditions. The diiference in loss is less than 25 W/m from the experimental results in literatures, thus the method has a higher accuracy than the results of the 2-dimensional algorithm, which proves the applicability of the method. The research results show that the established ion flow field model is in line with the physical reality, and has a certain reference significance for the study of corona loss of corona cage wires.

关 键 词：电磁环境 特高压电晕笼 电晕电流 电晕损失 交流离子流场 电场强度 

分 类 号：TM75[电气工程—电力系统及自动化]