| Title |
Transient Ground Impedances According to Shapes of Grounding Electrodes |
| Authors |
Bok-Hee Lee ; Su-Bong Lee ; Tae-Hyung Lee ; Hyun-Uk Jung ; Dong-Cheol Jeong |
| Keywords |
Transient ground impedance ; Potential rise ; Effective impulse impedance ; Deeply driven ground rod ; Grounding grids ; Surge protection |
| Abstract |
This paper presents the transient behaviors of grounding system impedance against lightning impulse currents. The dynamic characteristics of the deeply driven ground rod and grounding grid subjected to the impulse current were investigated. The transient ground impedance strongly depends on the configuration and size of grounding electrodes and the shapes of impulse currents, and the inductance of grounding electrodes has a significant affect on the transient ground impedance of grounding system. Also, the deeply-driven ground rod was effective to reduce the transient ground impedance in time domain of miceroseconds. |