摘要
对同塔四回路输电线的三维空间电磁干扰问题进行分析,包括其考虑弧垂影响时的三维空间电磁场的计算、相间距等因素对电场和磁场的影响以及回路间的耦合干扰问题。研究了在考虑弧垂影响时同塔四回路输电线的三维电磁场计算模型。以重庆地区一条现有110kV同塔四回线路为例,计算其三维电场与磁场的分布,并与其二维空间的电场与磁场进行比较。结果表明:采用二维模型计算的输电线的工频电场与磁场,与三维空间下电场与磁场计算结果的误差分别为11.2%与7.1%。分析了同塔四回路线路各个回路相间距对工频电磁场的影响,结果表明,对于同塔四回路输电线,在安全允许的条件下,相间距越小,其工频电磁场越小,传输功率越大,建议在城市电网的增容改造中,采用紧凑型四回路输电线。当四回线路中1个回路出现故障时,分析了其对杆塔同侧线路的耦合干扰。
In order to solve the growing urban grid load and the growing tension in the land resources, more and more four-circuits transmission lines have been built in China. In the paper, the calculation of electric field and magnetic field considering the influence caused by the sag is investigated. To a- void the shortcoming in current calculation method, the method to analyze the influence caused by the transmission lines sag is presented in the paper. A 110 four-circuits transmission lines in Chongqing was taken as an example, the electric field and magnetic field in 2D space and 3D space were calcu- lated respectively, and comparison was conducted. Results indicate that the electric and magnetic fields obtained in 2D space have an error of 11.2% for electric field, and 7.1% for magnetic field.In addition, because of the change of the parameters of multi-circuit transmission line, the interfer- ence between different loops in one tower is analyzed, and results indicate that the interference be- tween different loops should be calculated for line accident.
出处
《重庆理工大学学报（自然科学）》
CAS
2012年第5期51-56,85,共7页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目(51007096)
关键词
同塔四回
弧垂
电磁场
耦合干扰
four-circuit in one tower
sag
electromagnetic
coupled interference
