【摘要】 当地下金属管线与交流输电线并行时,由于两线路间存在感性耦合及阻性耦合,在管线中将感应电位及电流。本文给出计算管线感应电位及电流的各种精确公式及若干近似公式。更多还原

【Abstract】 When an underground pipeline is in parallel with AC transmission line, the current and potential will be induced in this pipeline due to the coupling between these two lines. This paper gives precise and approximate formule for calculating the induction effects. The primary and secondary transmission parameters of the pipeline are discussed. This paper gives the general formule for calculating the induced potential and the induced current in the pipeline, as its whold length is longer than the length of exposure. They are:respectively.It points out the popular formule in many literatures may be used only in case where the length of pipeline is equal to the length of exposure. They may be derived from the general formule shown in this work.These formules may be expressed as a function of terminal impedances Z1 and Z2or as a function of parameters n1 and n2, whene n1=arcth (Z1/Z2) and n2=arcth(Z2/Z0).In order to protect the pipeline against the harmful effects from the power transmission lines, protection measures are usually required. This paper gives also some of these measures.更多还原