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

Volume

4

fYear

2002

fDate

2002

Firstpage

2218

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Power System Technology, 2002. Proceedings. PowerCon 2002. International Conference on

Print_ISBN

0-7803-7459-2

Type

conf

DOI

10.1109/ICPST.2002.1047176

Filename

1047176