| Title |
Transient Response Characteristics Associated with the Common Connection Points in Grounding Systems for Electric Power Utilities |
| Abstract |
This paper describes the transient response characteristics of the grounding systems for electric power facilities against impulse currents. In this work, when the impulse current was injected through the grounding conductor for arrester, the investigations measuring and analyzing potential rises induced at the common connection point and other grounding conductors were conducted. The lightning impulse current was applied so as to simulate the on-set of arrester due to lightning surges. Measured results of impulse response characteristics from the present experiments are as follows; The ground electrode potential rise was significantly different with that induced at the ground conductor and the higher potential rise is induced at the isolated ground electrode. Also the potential rises at the ground electrode and conductor due to the impulse current were markedly changed with common connection position. The potential rise of the common connection point due to impulse current for near common connection was lower than that for remote common connection. The potential rise of the ground conductor for arrester in near common connection was higher than that in remote common connection. Therefore it could he concluded that the near common connection from ground electrode is more effective than the remote common connection in viewpoint of the potential rise reduction of commonly connected other grounding and the remote common connection is more effective in the insulation protection of power equipments. |