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To investigate the partial discharge behaviors of typical insulation defects under normal operating temperatures, DC cross-linked polyethylene cables were taken as the objects, three kinds of defects such as bubbles, protrusions, and scratches were introduced to the cables. High-frequency current signals were collected at 70℃ to analyze their discharge pulse characteristics, and the change laws of partial discharge inception voltage (PDIV) and extinction voltage (PDEV) were tested within the temperature range of 40-80℃. The results show that the PD behavior of different defects at the same temperature are significantly different, the protrusion defects exhibit the highest discharge pulse repetition rate, whereas the bubble and scratch defects show larger pulse amplitudes. Spectral analysis reveals that the frequency band of discharge signal from protrusion defect is broader and the energy distribution is wider. Temperature elevation significantly reduces the PDIV and PDEV for the three kinds of defects, among which bubble and protrusion defects are more sensitive to temperature, while scratch defects show a smaller change with temperature. Additionally, the difference between PDIV and PDEV of bubble defects is the largest, and the discharge sustainability is the strongest.
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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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