干式空心电抗器周围工频磁场分布

The Power Frequency Magnetic Field Distribution Around Dry-Type Air-Core Reactor

电抗器产生的强磁场是变电站内电磁污染的主要来源,对周围其他电气设备的运行以及变电站职工作业均构成安全隐患。本文建立了考虑涡流影响的空心电抗器磁场混合有限元模型,通过计算分析将场域外边界确定在电抗器组所在区域的7倍处是合理的。对500kV变电站的35kV品字形排列电抗器组进行了仿真计算,计算结果与该电抗器组实测值的比较表明,本文建立的混合有限元模型可对空心电抗器组的磁场分布进行评估,为电力部门选择更好的安装方式提供理论依据。另一方面,根据空心电抗器周围磁场的分布规律,建立一定的预警机制,为其他电气电子设备安全运行和变电站职工安全作业提供保障。

The strong magnetic field generated by reactors is the main source of electromagnetic contamination in substations, which interferes other electric equipment around reactors and has potential harm on substation employee. A mixed finite-element method model about the magnetic field of dry-type air-core reactor considering the effect of eddy current is proposed in this paper. The calculation region is selected 7 times of the air-core reactor region. Based on this method, the 35kV reactor group of equilateral triangles form in 500kV substation is calculated. The comparison between calculation results and measured values shows that the mixed finite-element method model may assess the magnetic field distribution around air-core reactors and provide theoretical basis for installation way of air-core reactors for power department. On the other hand, based on the magnetic field distribution around air-core reactors, an early-warning mechanism can be established, which can provide safeguard for the safe operation of other electronic equipment and the substation employee.