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Research on Insulation Performance of EPDM for Cables Under Extrusion Pressure and Thermal Stress Based on Polarization Current
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Siyu WANG, Yang LIU, Zhipeng LEI, Kunying HAN, Zhijie SHI, Zhaogui LIU, Ye WANG
Insulating Materials | 2022, 55(4) : 56 - 61
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Insulating Materials | 2022, 55(4): 56-61
• Material Research •
Research on Insulation Performance of EPDM for Cables Under Extrusion Pressure and Thermal Stress Based on Polarization Current
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Siyu WANG, Yang LIU, Zhipeng LEI, Kunying HAN, Zhijie SHI, Zhaogui LIU, Ye WANG
Affiliations
  • Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control, National & Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology, Taiyuan University of Technology, Taiyuan 030024, China
Published: 2022-04-20 doi: 10.16790/j.cnki.1009-9239.im.2022.04.008
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In order to clarify the interaction of electrical stress, thermal stress and mechanical stress on the insulating properties of ethylene propylene diene monomer (EPDM), we prepared EPDM samples and measured the polarization current of the sample at temperatures of 30‒120℃, pressures of 0‒1.0 MPa, and electric field strengths of 1‒25 kV/mm, respectively. For further evaluating the insulation performance of EPDM, the absorption ratio (K) was introduced. Based on the steady-state electrical conduction currents in the polarization currents, the quasi-steady-state electrical conduction current densities and conductivities of the sample were calculated. The results show that the insulation performance of EPDM is negatively correlated with temperature and electric field strength. In the low-field-strength area, the electrical conductivity of the sample conforms to the ohmic conductivity characteristics; in the high-field-strength area, conductivity conforms to the space charge limited current mechanism. By calculating the carrier mobility of EPDM, it is found that the carrier mobility decreases at first and then increases with the increase of pressure, which leads to the change of the insulation performance of EPDM.

EPDM  /  multiple stresses  /  polarization current  /  absorption ratio  /  conductivity  /  carrier mobility
Siyu WANG, Yang LIU, Zhipeng LEI, Kunying HAN, Zhijie SHI, Zhaogui LIU, Ye WANG. Research on Insulation Performance of EPDM for Cables Under Extrusion Pressure and Thermal Stress Based on Polarization Current[J]. Insulating Materials, 2022 , 55 (4) : 56 -61 . DOI: 10.16790/j.cnki.1009-9239.im.2022.04.008
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Article Info
doi: 10.16790/j.cnki.1009-9239.im.2022.04.008
  • Receive Date：2021-05-22
  • Online Date：2025-12-22
  • Published：2022-04-20
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  • Received：2021-05-22
  • Revised：2021-06-30
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    Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control, National & Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology, Taiyuan University of Technology, Taiyuan 030024, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.04.008
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表12种不同金属材料的力学参数
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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