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Polyurethane foam adhesive has good expansion filling characteristics, electrical insulation performance, and waterproofness. To achieve its application in filling the inner layer of the cable joint protective shell, at first, we tested the thermal, electrical, and mechanical properties of polyurethane foam adhesive with different foaming ratios. Then, a two-dimensional axisymmetric model of the cable joint was established, and the steady-state temperature field distribution of the cable joint under different filling adhesive conditions was simulated and analyzed. Finally, a physical model of the 110 kV intermediate joint was established, and thermal cycling tests were conducted on cable joints using different filling adhesives. The results show that all the performance test results of polyurethane foam adhesive are good. With the increase of foaming ratio, the thermal conductivity, insulation performance, and mechanical property of the foam adhesive decrease, with a foaming ratio of 3 times, the foam adhesive shows optimal comprehensive performance. The absolute error between the simulated and measured temperature values of various structure inside the joint using different filling adhesives are basically no more than 10%, which verifies the effectiveness of the simulation model. The steady-state temperature distribution of the joint filled with foam adhesive is similar to that of the joint filled with traditional waterproof adhesive.
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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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