Nodal frequency analysis of grounding systems considering the soil ionization effect

Author

Cidrás, José ; Otero, Antonio F. ; Garrido, Carlos

Author_Institution

Dept. Ingenieria Electr., Vigo Univ., Spain

Volume

15

Issue

1

fYear

2000

fDate

1/1/2000 12:00:00 AM

Firstpage

103

Lastpage

107

Abstract

Soil ionization takes place when the current leaking into the earth is high enough to produce an electric field intensity greater than a critical value. This phenomenon lowers the ground impedance and it is similar to an apparent increase in the electrode dimensions. Soil ionization has a great influence on the performance of small grounding electrodes fed by currents of high magnitude (i.e., lightning waves). In this paper, a new way of including the nonlinear soil ionization in the grounding system analysis is proposed. The study of the grounding system is performed in the frequency domain by means of an equivalent electric circuit

Keywords

earth electrodes; equivalent circuits; frequency-domain analysis; ionisation; power system protection; soil; current leakage; earth; electric field intensity; equivalent electric circuit; frequency domain; ground impedance; grounding electrodes; grounding systems; high magnitude currents; nodal frequency analysis; soil ionization effect; Circuits; Conductivity; Conductors; Earth; Electrodes; Frequency; Grounding; Ionization; Soil; Transient analysis;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.847236

Filename

847236