A Study of Grounding Grid Characteristics with Conductive Concrete

The purpose of this paper is to improve electromagnetic characteristics on grounding grid by applying the conductive concrete. The conductive concrete in this study is under an extra high voltage (EHV, 345kV) system located in a high-tech industrial park or science park. Instead of surrounding soil of grounding grid, the application of conductive concrete can reduce equipment damage and body damage caused by switching surges. The focus of the two cases on the EHV distribution system in a high-tech industrial park is presented to analyze four soil material styles. By comparing several soil material styles, the study results have shown that the conductive concrete can effectively reduce the negative damages caused by electromagnetic transient. The adoption of the style of grounding grid located 1.0 (m) underground and conductive concrete located from the ground surface to 1.25 (m) underground can obviously improve the electromagnetic characteristics so as to advance protective efficiency.

• Chun-Yao Lee
• Siang-Ren Wang

• Switching surges
• grounding gird
• electromagnetic transient
• conductive concrete.

[1] W. Xiong, F. P. Dawalibi, "Transient Performance of Substation
Grounding Systems Subjected to Lightning and Similar Surge Currents,"
IEEE Trans. on Power Delivery, Vol. 9, No. 3, July 1994.
[2] Sherif Yehia, Christopher Y. Tuan, David Ferdon, and Bing Chen,
"Conductive Concrete Overlay for Bridge Deck Deicing: Mixture
Proportioning, Optimization, and Properties" ACI Materials Journal,
No.97-M23, PP.172-181, Mar. 2000.
[3] Y. T. Chan, the literature of transmission system planning in Taiwan,
2006.
[4] F. Dawalibi, D. Mukhedkar, "Parametric Analysis of Grounding
Systems," IEEE Trans. on Power Apparatus and Systems, Vol. PAS-98,
No. 5, pp. 1659-1668, Sept./Oct. 1979.
[5] F. Dawalibi, "Electromagnetic Fields Generated by Overhead and Buried
Conductors. Part 1 - Single Conductor," IEEE Trans. on Power Delivery,
Vol PWRD-1, No.4, PP.105-111, Oct. 1986.
[6] F. Dawalibi, "Electromagnetic Fields Generated by Overhead and Buried
Conductors. Part 2 - Ground Networks," IEEE Trans. on Power Delivery,
Vol PWRD-1, No.4, PP.112-119, Oct. 1986.
[7] M. Heimbach, L. D. Grcev, "Grounding System Analysis in Transients
Programs Applying Electromagnetic Field Approach," IEEE Trans. on
Power Delivery, Vol. 12, No.1, pp. 186-193, Janu. 1997.
[8] ANSI/IEEE Std.80-2000, "IEEE Guide for Safety in AC Substation
Grounding," by IEEE Society, New York 2000.