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Inter-turn short circuit is the main fault type of dry-type air-core reactors. At present, there is a lack of effective offline detection method to discover potential faults in time before dry-type reactors put into operation. Based on the theory of multiconductor transmission line, a distributed parameter model of dry-type air-core reactor winding was built to simulate the refraction and reflection processes after pulse signal injection, and the influence law of inter-turn short circuit on the response signal at the head and end of winding was discussed. On this basis, a characteristic waveform was constructed by the integral value of response signal absolute value, and a characteristic value was extracted to diagnose the inter-turn insulation state of winding. The results show that the test results of four-eigenvalue method proposed in this paper based on the wave process and multiconductor transmission line theory are consistent with the simulation results. Through the simulation calculation of different structural reactor models, it is found that the eigenvalue change trend of different structural reactor is also consistent when the inter-turn short circuit fault occurs. Therefore, the above method can be applied to diagnoze the inter-turn short circuit fault of reactors with different structures. The research results can provide guidance for the diagnosis of the severity and regional localization of inter-turn short circuit in dry-type air-core reactor.
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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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