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Composite cross arm has wide application prospect because of its good insulation performance, light weight, and saving transmission corridor. However, the research on the production design, test acceptance, construction operation and maintenance, standards and specifications of composite cross arms, especially for 500 kV and above of composite cross arms is still blank at home and abroad. The electric field distribution characteristics of high-voltage composite cross arm during operation is a problem that must be solved in the process of design and acceptance of composite cross arm. In view of the above situation, an electric field distribution and potential calculation model of 500 kV composite cross arm was established in this paper. The 500 kV composite cross arm and its connected tower were simulated and analyzed by the finite element analysis software. In addition, for the convenience and operability of subsequent ageing and insulation experiments, a 500 kV composite insulation cross arm scaling model was established and its test voltage was determined. The results show that the maximum field strength on the surface of composite insulated cross arm occurs at the high voltage of cross arm, and the electric field strength is 3.82×105 V/m. The maximum electric field strength on the surface of the cable-stayed insulator is 86.38% of maximum electric field strength of the strut cross arm, and the maximum electric field strength is 3.3×105 V/m. The test voltage, which make the maximum surface electric field strength reach expected electric field strength, is determied as 60 kV when the scale model is reduced according to 1∶5, which provides theoretical basis for the initial test of composite cross arm.
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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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