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Outline
High-power high-voltage high-frequency transformers (H3T) are typically subjected to high du/dt pulsed voltage inputs. Their unique operational environment presents significant insulation challenges, making them highly susceptible to partial discharge (PD) initiation. The intense electromagnetic interference generated by high du/dt pulsed voltages substantially compromises the accuracy of PD detection. A novel joint detection method integrating ultra-high frequency (UHF) antennas with photomultiplier tubes (PMTs) is proposed, combining UHF’s advantages of high sensitivity and wide bandwidth with PMT’s superior anti-interference capability and rapid response characteristics. Signal fusion is achieved through amplitude correlation analysis by comparing temporal and spectral consistency between discharge signals acquired from UHF and PMT. The research reveals remarkable consistency in spectral steepness S and kurtosis K between the two detection modalities. The fusion method demonstrates average discharge count enhancements of 66.3% compared to PMT alone and 49.7% compared to UHF alone, significantly improving detection integrity. Furthermore, the analysis of PD characteristics under varying rise times demonstrates that shorter rise times induce earlier and more concentrated PD occurrences. Specifically, the average and maximum discharge amplitudes increase by 37.9% and 37.2%, respectively, while discharge repetition rates and cumulative discharge amplitudes show improvements of 37.1% and 22.1%. This study provides innovative methodology and technical support for achieving high-sensitivity, interference-resistant online PD detection under high du/dt pulsed voltage conditions.
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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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