電磁誘導遮へいケーブルの端末接地に埋設地線を併用した場合の遮へい効果の解析的検討

埋設地線が電力線と斜行している場合

抄録

As the method to reduce the induced voltage, the shielded cable with aluminum sheath and iron tape has been mainly used. In order to increase screening effect of the shielded cable, the grounding resistance at the terminal of the cable must be low. To obtain the low grounding resistance, the method using the buried straight horizontal wire with vertical ground rod at the terminal of the shielded cable is considered. Then, we carried out the theoretical analysis of screening effect for the shielded cable by buried straight horizontal wire laid parallel to the power line.
Now then, because of restriction of the site to lay the buried straight horizontal wire, it is often laid obliquely for the power line. Then, in this paper, the analysis method of screening effect by the wire laid obliquely for the power line and knowledges obtained from calculated results are clarified. Further, we propose the approximate calculation method of the shielding factor, which is useful in the practical design for grounding resistance.