A simplified method for calculating the impulse resistance of vertical grounding rods

Author

Xiaoqing, Zhang

Author_Institution

Dept. of Electr. Eng., Northern Jiaotong Univ., Beijing, China

Volume

3

fYear

2002

fDate

28-31 Oct. 2002

Firstpage

1881

Abstract

A simplified method is proposed for calculating the impulse resistance of vertical grounding rods. The analytic formula is first derived to determine the low current resistance and then the calculation procedure is developed to estimate the impulse resistance. In the procedure a nonlinear relationship is introduced to characterize the electric field and current density in the ionization zone surrounding the grounding rod. The effective radius of the grounding rod is evaluated according to the nonlinear relationship. The impulse resistance is calculated by substituting the effective radius into the analytic formula of the low current resistance. Finally, a comparison is made between calculated and measured results in confirmation of the validity of the proposed method.

Keywords

current density; earth electrodes; electric resistance; ionisation; calculation procedure; current density; electric field; ground potential rise; impulse resistance; ionization zone; low current resistance; nonlinear relationship; vertical grounding rods; Current density; Electric resistance; Electrical resistance measurement; Electrodes; Grounding; Ionization; Lightning; Soil; Substation protection; Surface resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

TENCON '02. Proceedings. 2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering

Print_ISBN

0-7803-7490-8

Type

conf

DOI

10.1109/TENCON.2002.1182704

Filename

1182704