Measurement of Impulse Grounding Impedance in Frequency Domain

Abstract

Impulse grounding impedance cannot be described as an absolute index, because it depends on the characteristic of the impulse current waveform, soil structure type and grounding system configuration, etc. This paper presents a test system to measure the impulse grounding impedance directly in time domain, moreover, calculated and defined in frequency domain. A field test for 110kV tower footing has been performed to measure the impulse ground impedance, and compared it with the ground impedance measured by fall-of-potential method.

The Analysis of Transient Grounding Resistance of Portable Horizontal Grid Earth Electrodes

“…The research of TGR becomes one of the most hot researches of electromagnetic protection. In [4], the character of the earth devices of transmission tower has been analyzed and a new method of testing TGR with impulse current signals is brought up. In [5], a new fast algorithm aiming at the transient current distribution of the building lightning protection system is presented.…”