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The temperature rise characteristics of gas-insulated transmission lines (GIL) determine their current-carrying capacity. To investigate the temperature rise characteristics of two typical environmental friendly insulating gases — perfluoroisobutyronitrile (C4F7N) mixed gas and dry air, the temperature rise process of a 126 kV three-phase common-tank GIL was simulated, and based on the simulation results, a temperature rise test platform was established. Then the temperature rise tests were carried out under conditions such as different gas dielectrics and current magnitudes. The results show that under the identical current conditions, the temperature rises of both C4F7N/CO₂ mixed gas and dry air under typical application parameters are similar, yet both exceed that of SF₆ gas. When the current loading is 3 150 A, both C4F7N/CO2 mixed gas-filled and dry air-filled equipment can meet the requirement of temperature rise not exceeding 75 K, but when the current loading is 3 465 A, neither filling with C4F7N/CO2 mixed gas nor filling with dry air can satisfy this requirement. It is also found that when the three gases were filled respectively, the temperature rise of phase B is higher than that of phase A and phase C, aligning with simulation results and thermal convection processes, indicating that the maximum temperature rise of phase B conductors requires special consideration in the temperature rise design of 126 kV three-phase common-tank GIL.
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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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