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Characteristics of fulgurite-like structures under HV conditions: Effects on electrical earthing systems

机译：高压条件下类珠状结构的特征：对电气接地系统的影响

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Fulgurites are natural tubes of glass formed by the fusion of silica sand or rock from a lightning strike. The fulgurites have been produced artificially in HV conditions in the past. Recent studies have found that fulguritic structures can be formed in some other materials, such as bentonite and cement, as well. These fulgurites can change the overall physical and electrical properties of the original materials. Thus, formation of fulgurites can modify the performance of electrical earthing systems, both ordinary and those improvised with backfill materials. This study investigates the fulgurite formation under alternating, direct and impulse current application. Bentonite and sand were tested under high voltage conditions. The type of fulgurites and their effects on electrical earthing systems were studied by analyzing the resistivity and permittivity of original materials and fulgurites. It has been found that fulgurites formation has a severe effect on the earth resistance of grounding systems.
机译：角铁是由雷击产生的硅砂或岩石融合而形成的天然玻璃管。过去已经在高压条件下人工制造了蛇舌草。最近的研究发现，在某些其他材料（如膨润土和水泥）中也可以形成触相结构。这些辉石可以改变原始材料的整体物理和电学性质。因此，形成辉石可以改变电气接地系统的性能，无论是普通的还是采用回填材料即兴的。这项研究调查了在交替，直接和脉冲电流应用下的辉石形成。膨润土和沙子在高压条件下进行了测试。通过分析原始材料和微晶石的电阻率和介电常数，研究了微晶石的类型及其对电气接地系统的影响。已经发现，形成辉石对接地系统的接地电阻具有严重的影响。

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