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In order to deeply study the variation rule of cable joint temperature and stress under micro-gap discharge and explore its influence on the cracking of the composite interface of cable joints, we took 110 kV cable intermediate joint as the prototype, established a three-dimensional simulation model combining with the most common air gap position in actual cable joint. Temperature, stress, and interface crack were taken as indexes to measure the damage degree of cable joint, the initial grip force between cable joint and ontology as well as the air gap pressure were taken into consideration, the charge law of temperature and stress of the joint with the change of gap discharge energy, air gap pressure, air gap thickness, and air gap position was calculated by finite element method. The effect of the change of gap discharge energy and air gap pressure on cracking situation of the composite interface of the joint was studied in detail. The results show that with the increase of the gap discharge power, the local temperature and stress near the gap increase rapidly, and the interface cracks appear at a distance from the original air gap and new gap generates. With the increase of the air gap pressure, the gap pressure decreases at first and then increases. The negative air gap pressure can increase the local stress, while the positive air gap pressure can reduce the local stress in a certain range, which leads to the interface cracking on both sides of the gap, results in the continuous expansion of the original gap.
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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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