近接する二つの接地極の間の移行電圧

抄録

There are some cases where a small-sized grounding electrode for communication or computer, is adjacent to a large-sized grounding electrode for power. In the cases, when fault current flows into the large-sized electrode, the small-sized electrode is affected with the transfer voltage V_s. For the design of the two adjacent grounding electrodes, V_s has to be well known. In this paper, V_s is computed by the method of images and the current source superposition method.
A grid electrode and a combination electrode of a grid and four rods, are taken as the large-sized grounding electrode. A grid, a counterpoise, a rod and a combination of a counterpoise and two rods, are taken as the small-sized grounding electrode. Homogeneous ground and two-layers ground of the first layer resistivity ρ₁ and the second layer resistivity ρ₂, are taken into consideration. From the obtained results, it is pointed out that V_s in the case of a combination electrode of a grid and four rods, as the large-sized electrode, is greater than V_s in the case of a grid electrode only. It is also pointed out that V_s in the case of ρ₁&ρ₂ is greater than V_s in the case of homogeneous ground, and V_s in the case of ρ₁>ρ₂ is smaller than V_s in the case of homogeneous ground.