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External force is the significant factor affecting the buffer layer ablation faults development of high voltage cables. The actual cable laying conditions and cable core gravity will lead to inhomogeneous force on the buffer layers. However, the influence of inhomogeneous force on the development process of buffer layer ablation faults is still unclear. In this paper, a simulating ablation experiment platform of buffer layers under inhomogeneous force was built. The influence of local inhomogeneous force on the buffer layer ablation development process was studied under dry and wet conditions. Then combining with the variation of buffer layer local volume conductivity, micromorphology and the components of ablation products, the affecting mechanisms of inhomogeneous force on the fault development were analyzed. The results show that in the dry condition, the current density of buffer layer decreases gradually with the ablation time, and the decreasing rate is higher in the force concentration region. While in the wet condition, the current density of buffer layer surges dramatically in the initial ablation stage, and then drops rapidly, exhibiting the characteristic of a current density peak. In the local force concentration region, the peak value of current density is larger, and the current density variation rate inner the peak is faster. It is analyzed that the local force concentration could increase the effective contact area between the buffer layer semi-conductive fibers, leading to the rising of current density and aggravating of ablation process.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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