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Based on the different discharge processes of lightning striking, lightning overvoltage can be divided into two types: induced lightning overvoltage and direct lightning striking overvoltage (including back-flash and shielding failure). The characteristics of these overvoltages are investigated in this paper and it is concluded that induced lightning overvoltage exists simultaneously in three phases...
Generally, the flow of a lightning impulse current from a grounding electrode into ground is a very complicated process determined by many factors. In order to analyze the mechanism of the impulse current dissipating in the earth from grounding electrode, the experiments that had carried out by other authors almost used a single horizontal grounding wire or vertical grounding rod for sake of simplicity...
Based on a lot of measurement and analysis, This paper find that the unbalanced nature of 35 kV grids due to unsymmetrical capacity values gives difficulty in neutral point operation in mountainous area of west China. Improving compensation of suppressing coil can rectify imbalance of voltage but bring up new problem that suppressing coil can not extinguish grounding arc effectively in fault. To put...
When impulse currents are injected into grounding electrodes and dissipate in the earth, the axial current distribution of the grounding electrodes will change with different electrode structures. In order to analyze the distribution law, using Rogowski coil as a current sensor, impulse simulation experiment is designed and performed on the grounding electrodes with various structures. Basing on the...
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