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An Efficient approach for Shielding Effect of the Grounding Electrodes under Impulse-Current Voltage based on Matlab

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Author(s): Ms. Kalyani Pole | Mr. A.K. Sharma

Journal: International Journal of Advanced Computer Research
ISSN 2249-7277

Volume: 2;
Issue: 2;
Start page: 80;
Date: 2012;
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Keywords: Grounding electrodes | modeling | power system lightning effects | MATLAB.

ABSTRACT
The lightning current waveform has a majorinfluence on the dynamic performance of groundelectrodes. While high lightning current intensityimproves the dynamic grounding performance dueto ionization of the soil, very fast fronted pulsesmight worsen the performance in case of inductivebehaviour. The previous analysis has often beenbased on quasistatic approximation that is notapplicable to very fast fronted pulses. PreviousResearch focused on analyzing the impulse currentdispersal regularity of different branches wheninjecting at one point. Comparing with the leakagecurrent distribution of a single ground electrode, itis found that the leakage currents along thebranches increase with the distance to the currentfeed point, and the more conductors near theinjection point, the more uneven the leakagecurrent distribution is. In this paper by simulationresult we indicate that shielding effect should betaken into account when analyzing the impulsecharacteristics of grounding electrodes. Based onthe simulation results, new empirical formulasapplicable for slow and very fast fronted lightningcurrent pulses are proposed. The effects of theionization of the soil are disregarded; therefore, thenew formulas are applicable for a conservativeestimate of the upper bound of the impulseimpedance of ground electrodes. In this paper wealso analyze and compare by the MATLAB. We alsoprovide dynamic behavior of ground electrodes.
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