【摘要】 杆塔接地装置的冲击接地电阻是影响输电线路耐雷水平的重要参数之一。垂直接地极能够立体的流散冲击电流，采用水平接地极与垂直接地极相结合的复合接地装置往往可以起到不错的效果。改变垂直接地极排布方式，各个导体段流散的电流也随之改变，考虑到土壤的火花放电，这势必会影响到接地导体的等值半径。建立了一种垂直接地极与水平接地极相结合的、考虑土壤火花效应的接地装置暂态电路模型，并通过该电路模型求解各段接地导体的等值半径，从而分析这类复合接地装置的冲击特性。结合实际分析，提出了一种垂直接地极的等差排布方式。仿真结果表明：该排布方式能有效提高垂直接地极流散雷电流的能力。在150Ω·m的土壤电阻率下，采用等差排布方式的接地装置相比于传统的等距排布方式，冲击接地电阻降低了2.4%,地表的最大电流密度分布下降了7.2%。更多还原

【Abstract】 The impact grounding resistance of tower grounding device is one of the important parameters that affect the lightning resistance of transmission line. Vertical grounding electrode can be three-dimensional flow impact current, using the combination of horizontal grounding electrode and vertical grounding device often can play a good effect. Due to the change of vertical grounding pole arrangement, the current flowing in each conductor segment will also change, taking into account the soil spark discharge, which is bound to affect the equivalent radius of the grounding conductor. A transient circuit model of the grounding device which combines the vertical grounding pole with the horizontal grounding pole and considers the soil spark effect is established in this paper, and the equivalent radius of each grounding conductor is solved by this circuit model, so as to analyze the impact characteristics of this kind of composite grounding device. Combining with the actual analysis, the author presents an arithmetic arrangement of vertical grounding pole. Simulation results show that this arrangement can effectively improve the ability of the vertical grounding electrode scattering lightning current. At the soil resistivity of 150Ω·m, the impact grounding resistance of the earth device using the isometric arrangement is reduced by 2.4% compared with the traditional isometric arrangement, and the maximum current density distribution on the surface is reduced by 7.2%.更多还原