임펄스전류에 의한 수직 접지전극 상호간 전위간섭 영향분석

초록

When the ground current is injected into adjacent ground electrode, the potential interference is caused between grounding electrodes. Ground potential interferences have been largely studies with power frequency fault currents. Many attempts to find a frequency-dependent grounding impedance report that the grounding impedance at high frequency is very different with the ground resistance. In this paper, the potential interference effects in the vicinity of vertical grounding rod of 4m long are measured according to the front time of the injected impulse current. The ground potential rises around the test ground rod of 4m were measured and discussed. As a result, the ground potential rises and potential interference factor are decreased with decresing the conventional grounding impedance. It was found that the lowering of conventional grounding impedance is critical to reduce the grounding potential interference effects