KIEE International Transactions on Electrophysics and Applications

The Korean Institute of Electrical Engineers (대한전기학회)
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Effective Impulse Impedances of Deeply Driven Grounding Electrodes

  • Lee, Bok-Hee (Research Center for Next-generation High Voltage and Power Technology, Inha University) ;
  • Jeong, Dong-Cheol (Research Center for Next-generation High Voltage and Power Technology, Inha University) ;
  • Lee, Su-Bong (Research Center for Next-generation High Voltage and Power Technology, Inha University) ;
  • Chang, Keun-Chul (Research Center for Next-generation High Voltage and Power Technology, Inha University)
  • Published : 2004.10.01
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Abstract

This paper presents the characteristics of transient and effective impulse impedances for deeply driven grounding electrodes used in soil with high resistivity or in downtown areas. The laboratory test associated with the time domain performance of grounding piles subjected to a lightning stroke current has been carried out using an actual-sized model grounding system. The ground impedances of the deeply driven ground rods and grounding pile under impulse currents showed inductive characteristics, and the effective impulse ground impedance owing to the inductive component is higher than the power frequency ground impedance. Both power frequency ground impedance and effective impulse ground impedance decrease upon increasing the length of the model grounding electrodes. Furthermore, the effective impulse ground impedances of the deeply driven grounding electrodes are significantly amplified in impulse currents with a rapid rise time. The reduction of the power frequency ground impedance is decisive to improve the impulse impedance characteristics of grounding systems.

Keywords

References

  1. N. Fujimoto, E. P. Dick, S. A. Boggs, G. L. Ford, 'Transient Ground Potential Rise in Gas-Insulated Substations-Experimental Studies', IEEE Trans., Vol. PAS-101, No. 10, pp.3603-3609, 1982
  2. S. Karaki, T. Yamajaki, K. Nojima, T. Yokota. H. Murase., H. Takahashi and S. Kojima, 'Transient Impedance of GIS Grounding Grid', IEEE Trans., Vol. PD-10, No. 2, pp.723-738, 1995
  3. T. Takahashi, 'A Part of Grounding for Lightning Protection Technique', J. of the Institute of Electrical Installation Engineers of Japan, Vol.9, pp.671-676, Sep. 1989
  4. J. H. Bogensperger, J. Frei and S. Pack, 'Resistance of Grounding Systems Stationary and Transient Behavior', Proc. 9th International Symposium on High Voltage Engineering, pp.6715. 1-4, Sep. 1995
  5. IEEE Std 81.2-1991, 'IEEE Guide for Measurement of Impedance and Safety Characteristics of Large, Extended or Interconnected Grounding Systems', IEEE Inc., pp.17-31, Dec. 1991
  6. R. Kosztaluk, M. Loboda and D. Mukhedkar, 'Experimental Study of Transient Ground Impedances', IEEE Transactions on Power Apparatus and Systems, Vol.PAS-100, No.11, pp.46534660, Nov., 1981 https://doi.org/10.1109/TPAS.1981.316807
  7. Z. Stojkovic, M.S. Savic, J.M. Nahman, D. Salamon and B. Bukorovic, 'Sensitivity Analysis of Experimentally Determined Grounding Grid Impulse Characteristics', IEEE Trans., Vol. PD-13, No. 4, pp.1136-1141, Oct. 1998
  8. B. H. Lee, J. S. Park and S. C. Lee, 'Experimental Investigations of Transient Impedances of Some Grounding Systems', 1997 Japan-Korea Joint Syms. ED & HVE, pp.237-240, Oct. 1997
  9. B. R. Gupta and B. Thapar, 'Impulse Impedance of Grounding Grids', IEEE Transactions on Power Apparatus and Systems, Vol.PAS-99, No.6, pp.214-218, Nov/Dec, 1980
  10. M. Ramamoorty, M. M. Babu Narayanan, S. Parameswaran and D. Mukhedkar, 'Transient Performance of Grounding Grids', IEEE Transactions on Power Delivery, Vol.4, pp.2053-2058, No.4, Oct.1989 https://doi.org/10.1109/61.35630
  11. W. Xiong and F. P. Dawalibi, 'Transient Performance of Substation Grounding Systems Subjected to Lightning and Similar Surge Currents', IEEE Transactions on Power Delivery, Vol.9, No.3, pp.1412 -1417, Jul. 1994 https://doi.org/10.1109/61.311170