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The ablation of the buffer layer of high-voltage cables is accompanied by the release of characteristic gas, so the characteristic gas can be used as an indicator for the detection and evaluation of ablation faults. However, the correlation between the type and concentration of released gas and the degree of ablation is still unclear. In this paper, a buffer layer ablation simulation experiment platform was established. After comprehensive consideration, C2H6, C2H4, C2H2, and CO were selected as the characteristic gases for buffer layer ablation evaluation, and the change law of their stoichiometric characteristics with buffer layer ablation degree and moisture content were analyzed. The results show that the average molar mass of characteristic gas decreases with the increase of moisture content in buffer layer, and the ratio of C to H atoms in characteristic gases under humid conditions is higher than that under dry conditions. The concentrations of C and H atoms continuously increase with the burning time, and with the increase of burning time, the concentrations of C and H atoms first decrease, then increase and then decreases, and finally monotonically increase with the increase of moisture degree. Analysis suggests that the differences of damage to the buffer layer structure under different conditions are the reasons for the change in the stoichiometric characteristics of the released gas.
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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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