摘要
为减小空心电抗器对附近接地系统的磁场干扰,提出了采用并联独立二次接地体与放射状地网结构两种技术方案以减小接地系统感应电流。本文对某500 kV变电站的二次电缆屏蔽层电流和主网格状地网感应电流展开测试。根据电路理论模型与现场实验结果,分析了并联独立二次接地体对不同线路屏蔽层感应电流的抑制效果。通过建立三维电磁场仿真模型对放射状地网结构抗干扰效果进行讨论。通过仿真与实验结果表明,并联独立二次接地体能够抵消屏蔽层一半以上感应电流,电抗器底部采用放射状地网结构能够有效减小磁场干扰。
To suppress the magnetic interference on grounding system caused by air-core reactors, two kinds of schemes to reduce the induced current of grounding system are proposed, one is to adopt independent secondary grounding body, the other is to adopt radial grounding grid structure. In this paper, the current of secondary cable shielding layer and grid grounding network is measured in a 500 kV substation. According to the reverse-voltage theoretical model and on site experiment results, the effect of adding independent secondary grounding body for shileding layers of different lines is analyzed. Futhermore, a 3D electromagnetic model is built to simulate and compare the anti-interference effect for radial grounding grids. The emulational data and experimental reasults show that by using secondary grounding body, more than half of the induced current can be reduced, and the radial grounding grids under reactor can suppress the magnetic interference effectively.
出处
《南方电网技术》
北大核心
2017年第5期36-40,共5页
Southern Power System Technology
关键词
空心电抗器
磁场干扰
接地系统
感应电流
air-core reactor
magnetic interference
grounding system
induced current
