Investigation and Electromagnetic Modeling of Earth Grid Islanding and Its Effect on Touch and Step Voltage Profile Variation Using Finite Element Method

Document Type : Original Article

Authors

1 Assistant Professor, Faculty of Electrical Engineering, Arak University of Technology, Arak, Iran

2 Undergraduate student, Faculty of Electrical Engineering, Arak University of Technology, Arak, Iran

3 Master student, Faculty of Electrical Engineering, Arak University of Technology, Arak, Iran

Abstract

The earth grid at high voltage substations should provide safety for people and normal equipment operation, therefore design calculations should be consideredaccurately. Step and touch voltages are among the items that affect people’s safety at high voltage substations. Grounding is suitable so that in addition to having low electrical resistance to the ground, it does not increase the step and touch voltages. Among the factors that laed to an increase in the electrical resistance of the earth’s grid is the tearing of the earth’s grid due to factors such as corrosion of conductors. In this article we provide a description of the appropriate design of high voltage substations grid to simulate the overhead substation grid and its effect on step and touch voltages in ComsulMultiphysics software based on the finit element method. After performing the simulation,it is noticed  that the stepand touch voltages in the two-and three-piece earth’s grid are much higher than the healthy earth’s grid and about 48 times comparing with the normal grid.

Keywords

References

[1] R. Hooshmand, “Design of High Voltage Substations,” Isfahan University Press, Isfahan, 2012.##
[2] H. Kalhor, “Electric Planting,” Shiraz University Press, 2018.##
[3]  S. A. Taher and A. Shemshadi, “Analysis and Design of a New Method for Reduction of Touch and Step Voltages for Earthing Systems Using FEM Approach,” International Journal of Electrical and Power Engineering .vol. 2, Issue 6, pp. 409-414, 2008.##
[4] M. Nayel, J. Zhao, J. He, Z. Cai, and Q. Wang, “Study of Step and Touch Voltages in Resistive/Capacitive Ground due to Lightning Stroke,” 4th Asia-Pacific Conference on Environmental Electromagnetic, Dalian, pp. 56-60, 2006.##
[5] U. Schümann, F. Barcikowski, M. Schreiber, and H. C. Kärner, “FEM Calculation and Measurement of the Electrical Field Distribution of HV Composite Insulator Arrangements,” 39th cigre session, Paris, , pp. 404-408, 2002.##
[6] A. Habjanic and M .Trlep, “The Simulation of the Soil Ionization Phenomenon around the Grounding System by the "Finite Element Method,” IEEE Transactions on Magnetic, vol. 42, no. 4, pp. 867-870, 2006.##
[7] N. Golihaghighi and M. Biguesh, “Node Selection in a Cooperating Position Finding Distributed System Concerning the Computational Complexity Reduction,” Scientific Journal of Radar, vol. 7, Issue 2, pp. 15-23, 2020.##

Files

History

  • Receive Date: 31 August 2020
  • Revise Date: 22 December 2020
  • Accept Date: 30 December 2020

Share

How to cite

Statistics