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With the rapid development of offshore wind power, high-voltage XLPE submarine cables are palying critical role in transmitting electricity in the marine transmission system. In order to investigate the effect of thermal oxygen ageing on the frequency domain dielectric properties of high-voltage XLPE submarine cables, XLPE samples were conducted accelerated ageing experiments at 135℃, and the frequency domain dielectric properties of XLPE samples with different ageing degree were tested. When analyzing the dielectric properties of measured samples, we found that a large amount of conductance loss and polarization loss were superimposed in the low and medium frequency domains, which seriously affected the accuracy of applying frequency domain dielectric properties to assess the ageing state of high-voltage XLPE submarine cable insulation. To slove this problem, a method for separating conductance loss and polarization loss in dielectric response data was deduced. Finally, the effect of conductance loss on the accuracy of model parameter identification was explored, and a characteristic parameter to characterize the ageing degree was proposed. The results show that the frequency domain dielectric curves of high-voltage XLPE submarine cables shift towards high frequency as the ageing progresses, and the low-frequency dispersion phenomenon becomes more apparent. The accuracy of H-N (Havriliak-Negami) model parameter identification can be improved by removing the conductance loss in the imaginary part of complex dielectric constant. The relaxation strength ∆ε and high-frequency dielectric constant ε∞ could characterize the insulation ageing state of high-voltage XLPE submarine cables, which can realize the assessment of insulation ageing for high-voltage XLPE submarine cables.
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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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