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According to the actual situation of outgoing section at Changping station of Zhangnan-Changping 500 kV round Ⅲ line (Beijing section), a trampled composite insulation cross arm narrow base linear tower for 500 kV line was designed and developed. The cross arm structure used the form of “two pull and two press”, and suspension insulator string was not required, which can reduce the fault caused by the monsoon discharge at tower head. Alicyclic epoxy umbrella skirts were arranged at intervals in the middle of compression bar, which makes the structure can be trampled. According to the original line form, considering the tower structure, air clearance requirements, and deflection deformation calculated by simulation under the conditions of reserved safety factor, we confirmed the structure height and mandrel diameter of the product. The mechanical instability conditions of the structure were analyzed under three severe working conditions, including break line, vertical strong wind, and ice covering. The results show that the overall first-order buckling coefficient is greater than 2.5, the axial stress of each unit is far less than the mechanical strength of metal and composite materials, and the structure has high safety. The mechanical properties of 1∶1 true type test tower and the electrical properties of upper phase composite insulation cross arm can meet the test standard and design requirements.
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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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