摘要
在实际工程中,特高压交流输电线路为保证三相平衡经常采用变相序的方法进行运行。为掌握相序对特高压交流输电线下工频电磁场的影响情况,笔者以荆门—南阳—晋东南1 000 kV特高压输电线路为例,采用线单元模拟电荷法和基于毕奥—沙伐尔定律的数值计算方法分别对不同相序运行时的工频电场和工频磁场分布情况进行了仿真分析。分析发现:同相序排列时电场强度较大,逆相序排列时电场强度较小,而工频磁场在逆相序排列方式时稍大,在同相序排列方式时较小。
To ensure three-phase equilibrium, ultra-high voltage（UHV） AC transmission lines often operate with changeable phase sequence. In this paper, the Jingmen-Nanyang-Southeast Shanxi 1 000 kV UHV transmission line is taken for example to investigate the effect of phase sequence on the power frequency electromagnetic field under the UHV AC transmission line. The line unit charge simulation method and the numerical calculation method based on Biot-Savart law are employed to simulate the distributions of power frequency electric field and magnetic field for different phase sequences. The results show that the electric field intensity is higher in same phase sequence but lower in reverse phase sequence, while the magnetic field intensity behaves reversely.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第3期82-87,共6页
High Voltage Apparatus
关键词
相序
特高压
工频电磁场
仿真
phase sequence
UHV
power frequency electromagnetic field
simulation
