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Aimed at the insulation deterioration of movable cables caused by the tensile force in practical use, we mainly study the effect of the different tensile degree on the insulating properties of ethylene propylene diene monomer (EPDM) insulation based on polarization and depolarization current (PDC). A tension device was designed to measure the PDC and surface potential decay of EPDM under the tensile state, and the influence of tensile ratio on the insulating properties of EPDM was analyzed form the perspective of DC conductivity and trap energy level distribution. The reason for the change of insulating properties of EPDM under tensile state was explained on a micro level. The results show that there is a threshold value of the effect of tensile ratio. When the tensile ratio is lower than 1.4, the PDC decreases with the increase of the tensile ratio. When the tensile ratio is higher than 1.4, the PDC increases with the increase of the tensile ratio. When the tensile ratio increases from 1.0 to 1.4, the decrease of trap numbers leads to the decrease of surface potential decay rate. When the tensile ratio increases from 1.4 to 1.8, the increase of shallow trap numbers promotes the dissipation and migration process of charge, which increases the surface potential decay rate. The influence of tensile stresses on EPDM insulation can be divided into three stages: the amorphous state, elastic deformation stage, and inelastic deformation stage.
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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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