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Aiming to the copolymerized polypropylene (PP) material with low transparency, an electrical tree initiation voltage test system based on high frequency current sensor (HFCT) was designed. It was confirmed that the test system could detect partial discharge signal as low as 5 pC, and the test sensitivity was higher. Through the identification test of partial discharge signal, it was found that the main spectra of discharge caused by electrical tree initiation located at 12.9 MHz, which were different from the other disruptive partial discharge signals probably generated in test system. It was proved that the obtained partial discharge signal with a specific frequency characteristic was caused by the electrical tree initiation of sample. The transparent XLPE sample was conducted verification experiment, it was found that the electrical tree initiation voltage measured by the test system was almost the same as that measured by microscopic observation system, which confirmed the practicability of the electrical tree initiation voltage test system based on HFCT. Then, the effects of three voltage stabilizers of AOHBP, RBBT, and RQCT on the AC electrical tree initiation voltage of copolymerized PP material were investigated, respectively. The results show that three kinds of voltage stabilizers can all increase the initiation voltage and quenching voltage of partial discharge in the process of electrical tree initiation of PP with appropriate addition amounts. The optimal components are PP+0.6 phr AOHBP, PP+0.4 phr RBBT, and PP+0.6 phr RQCT, respectively. Among them, PP+0.6 phr AOHBP has the best inhibiting effect of electrical tree initiation, making the initial voltage of electrical tree increase by 33.0%.
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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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