Title :
Direct measurement of frequency domain impedance characteristics of grounding system
Author :
Choi, Jong-kee ; Ahn, Yong-Ho ; Goo, Sun-Geun ; Park, Kijun ; Yoon, Jin-Yul ; Jung, Gil-Jo
Author_Institution :
Power Syst. Lab., Korea Electr. Power Res. Inst., Daejeon, South Korea
Abstract :
Although DC ground resistance is a good index of performance for a grounding system, it does not reflect the grounding performance during the transient states. Besides, impulse ground impedance, which is defined by a ratio of the peak value of transient ground potential rise to the peak value of impulse current, cannot be an absolute performance index due to its dependence on impulse current shape. In this paper, a ground impedance of mesh-type ground grid has been measured in the frequency range from 0.1 Hz to several hundred kHz. A transfer function of the ground grid is identified from the measured values of ground impedance in the frequency domain. An EMTP simulation has been performed to verify the usefulness of the transfer function of the ground grid.
Keywords :
earthing; electric impedance measurement; frequency response; power system measurement; power system protection; transfer functions; DC ground resistance; EMTP; computer simulation; frequency domain; impulse ground impedance; mesh-type ground grid; power network grounding system; transfer function; transient state grounding performance; Electrical resistance measurement; Frequency dependence; Frequency domain analysis; Frequency measurement; Grounding; Impedance measurement; Performance analysis; Poles and towers; Power system transients; Wires;
Conference_Titel :
Power System Technology, 2002. Proceedings. PowerCon 2002. International Conference on
Print_ISBN :
0-7803-7459-2
DOI :
10.1109/ICPST.2002.1047176
