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In order to understand whether the power frequency electric field level generated by the UHV AC power transmission and transformation project meets the relevant requirements, this paper uses the EFA-300 power frequency field strength meter to conduct the cross-section of the substation and transmission line of the Ximeng-Shengli 1 000 kV AC power transmission and transformation project, and evaluate the uncertainty of the measurement results. The results show that the maximum measured value of the substation boundary is (3.65±0.18) kV/m, k=2, which is lower than the electric field limit of the substation boundary, 4 kV/m; the maximum measured value of the line cross-section is (5.41±0.28) kV/m, k=2, which is lower than the electric field limit below the overhead transmission line, 10 kV/m, which meets the requirements of relevant national standards. It is found that the error of the field strength meter has a great influence. The uncertainty of the power frequency electric field measurement can be reduced by improving the calibration accuracy of the power frequency field strength meter. This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China-Research on Power Frequency Electric Field Calibration Technology (GYW1720200201).
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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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