Respons Impuls Pada Elektroda Pentanahan Batang Tunggal Untuk Menentukan Nilai Impedansi Pentanahan

A good grounding system belived if the its resistance has a small value that measured with DC source or low frquency. Meanwhile, lightning stroke that caused impulse current with high frequency up to kHz, so when gounding system work when striking by lightning, its impedance not only mark out by resisftif component but also will affected by induktif and capasitif value. In this paper discussed impedance of grounding system for driven rod that burried with varying dept from 2 to 6 meter. Then impulse injected to imitate lightning stroke as a voltage source with high frequency. From measurement and calculation result it’s shows that the lowest grounding system was 23,01 Ω when the dept of driven rod 6 m and grounding impedance decrease abut 5.25 Ω pe meter. Experiment result compare with simulasion using EMTP. EMTP model for driven rod using a R-L-C model. The result shows the magnitude of voltage and current for both experiment and simulation have a good correspondingly, but response for simulation has a far farter tail time impulse. Keyword: impulse response, grounding impedance, driven rod groundin