Basic Study of High-Frequency Impedance Characteristics of Ground System

Tsuchida, Takashi; Tsuneoka, M.; Ohkawa, Yoshinao; Nakajima, Yuuta

doi:10.1541/ieejias.128.1239

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2012

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“…Grcev and Dawalibi [5] built a model of the simple frequency characteristic of the grounding grid. Others have studied the frequency model of the grounding grid according to the complex image method [6][7][8]. Based on the frequency model, some diagnosed the broken location of a grounding grid by measuring the magnetic field on the ground [9,10].…”

Section: Introductionmentioning

confidence: 99%

A Fault Diagnosis Method for Substation Grounding Grid Based on the Square-Wave Frequency Domain Model

Zhang¹,

He²,

Zhang³

et al. 2012

Metrology and Measurement Systems

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Current methods of fault diagnosis for the grounding grid using DC or AC are limited in accuracy and cannot be used to identify the locations of the faults. In this study, a new method of fault diagnosis for substation grounding grids is proposed using a square-wave. A frequency model of the grounding system is constructed by analyzing the frequency characteristics of the soil and the grounding conductors into which two different frequency square-wave sources are injected. By analyzing and comparing the corresponding information of the surface potentials of the output signals, the faults of the grounding grid can be diagnosed and located. Our method is verified by software simulation, scale model experiments and field experiments.

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