Research On Impulse Grounding Technology And Influence Factors Of Tower Grounding Electrode

Grounding technique has important influence to the safe and stable operation of the power system.Power grid in China is moving toward the direction of greater, higher power, more intelligent, The development put forward higher challenge to reliable, safe and effective operation of the present stage grid, So it is necessary to analysis the grounding problem of transmission line tower. This article mainly studies the influence of the grounding electrode layouts to grounding resistance, obtain the scheme of effectively reduce the impulse grounding resistance of tower,provide technical support for the grounding device in the engineering design.The impulse theory and analytical method of the grounding electrode was studied in this paper.Using the international famous grounding engineering analysis software CDEGS, the effect of horizontal grounding electrode length to reduction effect was analysised. At the same time, the influence of vertical grounding electrodes length and number to the grounding resistance reduction effect of grounding electrode was analysised.Second, the influence of grounding electrode length to reduction effect of Y type grounding electrode was analysised. With the increase of side length of Y type grounding electrode, grounding resistance reduction effect was more and more obvious, and finally tended to be stable. When increasing the vertical grounding electrodes, with the increase of length of vertical grounding electrodes, the power frequency and impulse resistance reduction rate presented increasing trend, this trend tended to be stable finally。Again, the typical grounding resistance reduction effect was analysised. Under the condition of power frequency and impulse, with the increase of radiation grounding length, grounding resistance reduction effect was more and more obvious, and finally tended to be stable.Under the impulse current, with the increase of length of vertical grounding electrodes, improved grounding resistance reduction rate were rising rapidly, and finally tended to be stable. After increasing vertical grounding electrodes, the impulse current in grounding electrode always show the three-dimensional space scattered, in addition to flow along the horizontal dispersion, also will flow to the soil through the vertical grounding electrodes.