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Modelling the disturbance caused by a dc-electrified railway to geomagnetic measurements

机译：对直流电气化铁路对地磁测量造成的干扰进行建模

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摘要

Magnetic fields created by a dc-electrified railway are a nuisance to the operation of a geomagnetic observatory and also disturb other electromagnetic studies. Theoretical formulas that enable quantitative estimates of the magnetic effect of a dc railway including leakage currents in the ground are presented in this paper. They are illustrated by numerical examples. The validity of the theoretical model was verified by measurements carried out in the vicinity of a nearly north-south railway in Calgary, Canada. The earth structure in that area is approximately layered, which is an assumption included in the theoretical model. The agreement between the measured magnetic fields due to trains and the theoretical values is good. Numerical computations indicate that magnetic fields larger than the maximum allowable noise level (assumed to be about 10 pT) at today's magnetic observatories may extend to distances of tens of kilometres from a railway. We have prepared computer programs based on the theoretical formulas in the MatLab, Octave, FORTRAN and IDL languages, in which the locations (i.e. the latitudes and the longitudes) of the point of observation, of the feeding substations and of the trains, together with the feeding and leakage currents and the heights of the feeding lines, can be given as inputs.
机译：直流电气化铁路产生的磁场对地磁观测站的运行是有害的，并且还会干扰其他电磁学研究。本文提出了能够定量估计包括地下泄漏电流的直流铁路的磁效应的理论公式。它们通过数值示例进行说明。通过在加拿大卡尔加里的一条近南北铁路附近进行的测量，验证了该理论模型的有效性。该区域的地球结构大致分层，这是理论模型中包含的一个假设。列车测得的磁场与理论值之间的一致性很好。数值计算表明，在当今的磁观测站中，大于最大允许噪声级（假定约为10 pT）的磁场可能会延伸到距铁路数十公里的距离。我们已经根据MatLab，Octave，FORTRAN和IDL语言的理论公式编写了计算机程序，其中包括观测点，馈电变电站和火车的位置（即纬度和经度）以及馈入和泄漏电流以及馈线的高度可以作为输入给出。

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