[논문]Effective Impulse Impedances of Deeply Driven Grounding Electrodes

Lee, Bok-Hee; Jeong, Dong-Cheol; Lee, Su-Bong; Chang, Keun-Chul

Effective Impulse Impedances of Deeply Driven Grounding Electrodes 원문보기

KIEE international transactions on electrophysics and applications, v.4C no.5, 2004년, pp.207 - 214

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)

Abstract ▼ AI-Helper

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.

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대상 데이터

The experiments were carried out in the deeply driven grounding electrodes of 12, 30 and 48 m lengths and the commercial grounding pile of 30 m in length using lightning impulse currents at the testing site of Inha University in Incheon, Korea. The transient ground impedances of the model deep-driven grounding electrodes as a function of the length of grounding electrodes were measured.

이론/모형

The fine waveform of grounding electrode potential to the impulse currents was measured without electromagnetic coupling effects by using the modified fall-of-potential method. The effective impulse ground impedance of deeply driven grounding electrodes is much greater than the ground resistance and decreases with an increase in the length of grounding electrodes under all of our experimental conditions.

참고문헌 (11)

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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
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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
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

상세보기
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
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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
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상세보기
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

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