强电线对地下金属管线的电磁耦合影响及防护技术

ELECTROMAGNETIC COUPLING BETWEEN LONG-DISTANCE METALLIC LINES AND THE PROTECTION MEASURES AGAINST IT

本文给出计算并行回路间耦合影响的公式及当管线全长大于接近长度时计算管线上感应电位及感应电流的普通公式。作者指出,现有文献中的常见公式仅适用于管线长度等于接近长度的情况。 本文给出了积分指数函数E?(γy)的计算公式,讨论了若干防护措施,还给出了用微机计算磁耦合影响的实例。这些公式均可由本文所列普遍公式推导出来,是本文的特例。

This paper presents formnlae for calculating the coupling effects betweenmetallic pipelines and AC transmission lines, the induced potential andinduced current in the pipeline when its total length is greater than that ofexposure, as well as formula for calculating the integral-expotential functionEi(γy). It should be noticed that certain formulae commonly seen in some literatures can be used only in the case where the entire pipeline length is equalto the length of exposure.They may be derived from the general formulae pro-posed by the authors,as is proved in the paper; some protection measures arealso discussed and illustrative examples are given to calculate the effects ofmagnetic coupling by the use of microcomputer.