配电干线周围工频磁场的简化计算方法

Simplified Evaluation of Power Frequency Magnetic Fields around Heavy Current Carrying Risers in Buildings

重载流配电干线是建筑物内主要的工频磁场源之一。为评估建筑物内的电磁环境,有时需要定量分析配电干线周围的磁场。本文总结出单芯电缆、多芯电缆、空气绝缘母线槽和全封闭母线槽等各种建筑物配电干线周围工频磁场的简化计算方法,并通过算例比较分析了配电干线的选择对磁场水平的影响。结论:从降低周围工频磁场的角度考虑,电缆干线应尽可能采用多芯电缆,母线槽干线则宜采用全封闭母线槽。

The building electromagnetic envir - onment is of increasing concern. Heavy current carrying distribution risers are important power frequency magnetic field sources in buildings. To evaluate electromagnetic environment, it is necessary to analyze quantitatively magnetic field around main lines. This paper summarizes simplified evaluation methods of such magnetic fields. The often-see risers such as single-core and multi-core cables, air insulated busbar and compact busduct etc. are considered. The riser type impact on magnetic fields are also analyzed via magnetic field evaluation. This conclusion is drawn, i.e. to low power frequency magnetic field, cable risers should adopt multi-core cables, and busbar risers may adopt full- sealed busbar trough as possible.