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The low voltage winding interturn insulation fault of dry-type transformer is not easy to find directly through the appearance of the phenomenon, and is difficult to real-time monitoring, seriously affecting the safe and stable operation of power systems. In view of the lack of fault detection methods due to insufficient research on the electromagnetic characteristics of single-turn interturn short-circuit faults in low-voltage windings of dry-type transformers, and the difficulty in setting interturn short-circuit faults in practical projects, finite element simulation software was used to establish a field-circuit coupling model which is consistent with the actual dry-type transformer, and the accuracy of the model was verified under rated operating conditions. On this basis, the variation rules of electromagnetic parameters of short-circuit turns at different positions were explored when interturn short-circuit faults occur in low-voltage windings. The distribution of electromagnetic force on short-circuit turns when interturn short-circuit faults occur in windings at different positions was simulated. The results show that when the interturn short circuit occurs at different positions of the winding, the maximum magnetic density appears in the outermost short-circuit turn; the outermost short-circuit turn is subjected to the largest radial force, and the innermost short-circuit turn is subjected to the largest axial force. Therefore, it provides a theoretical basis for on-line monitoring and protection technology of dry-type transformer interturn insulation, which is conducive to the research and implementation of measures to improve short-circuit resistance.
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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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