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In order to better use the repetitive surge oscillograph (RSO) method to quantitatively evaluate the turn-to-turn insulation defects of generator rotor winding, we conducted turn-to-turn short circuit simulation tests under different positions, different short circuit coils, and different short-circuit resistance on a real rotor when the generator was being repaired. The response waveform and characteristic waveform of the two poles were obtained by the RSO device. Three characteristic parameters that is voltage deviation rate, time deviation rate, and fault severity factor were proposed to study the characteristic waveform. The results show that RSO can be used to quantitatively evaluate the severity of turn-to-turn insulation defects of rotor, the fault type of rotor winding can be quickly determined according to the amplitude and deviation rate of voltage of characteristic waveform, and the fault location can be basically realized according to the time deviation rate. The voltage amplitude of the RSO characteristic waveform has a linear positive correlation with the number of short-circuit coils, and has an exponential relationship with the short-circuit resistance and the center time, respectively. The fault severity factor has a linear positive correlation with the number of short-circuit coils. According to the analysis results, two methods to quantitatively evaluate the severity of rotor turn to turn insulation defects are proposed, which can be used to accurately evaluate the turn-to-turn insulation status of rotors.
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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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