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External grounding grid is an effective measure to reduce grounding resistance of grounding grid. In order to meet the requirements of the grounding resistance in the most economical way, it is important to determine the distance and the area of the external grounding grid. Generally speaking, when the area is larger, the grounding resistance is smaller. When the distance of the external grounding...
The short-circuit current in a substation may result in not only step voltage and touch voltage on person, but also interference in secondary cable. In this paper, the effect of the short-circuit current on the interference in the secondary cable was investigated by experiment. By making a single-line-to-ground fault in an actual 220/110 kV substation artificially, the transient voltages in various...
Paper is focused on simplified modeling of the railway traction system in 2 dimensional space. The model is based on grid of resistances that represents the tracks, ground, insulations and third party infrastructure. The outputs of the simulations can be used to pre-determine the impact of stray current on the railway system and also on metallic objects buried in vicinity of the track. Model in this...
Grounding grids play an important role in guarantee the safe operation when the station has encountered the short circuit or be attacked by lighting. Grounding grids must reconstruct when grounding resistance does not meet the regulation requirements. Using ion earthing electrode to reconstruct the grounding grid will cost less and have better effect. However, this way may increase the corrosion of...
The shunt coefficient of lightning shield line is an important parameter, which needs to be considered when we are designing or reforming the substation grounding network, however, it is difficult to be calculated. This paper is to introduce a method to measure the shunt impedance of lightning shield line with a substation transformer to calculate the shunt coefficient of lightning shield line. This...
Based on finite-element method of 1-dimensional conductor element coupled with 3-dimensional soil element, a coordinate transformation is carried out. The irregular hexahedron domain of element is mapped onto a cube domain. Considering the frequency dependent characteristic of the discretized elements, the grounding performance of the substation grounding grids in multilayer earth is analyzed, and...
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