Electric Power ›› 2021, Vol. 54 ›› Issue (4): 19-25.DOI: 10.11930/j.issn.1004-9649.202006016

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Impact of Different Pressures on Charge Transport in EPDM

HE Yifei, WU Kai, WU Yang, WANG Jinghao, ZHANG Chunyang   

  1. State Key Lab. of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2020-06-01 Revised:2020-07-22 Published:2021-04-23
  • Supported by:
    This work is supported by National Key Research and Devlopment Program of China (No.2016YFB0900703)

Abstract: Ethylene-propelene-diene monomer (EPDM), as a high-quality insulation material, has been widely used in accessories of cable joints, but it bears a large compressive pressure in the working environment, which may affect its insulation performance. We conduct a study on the effect of pressures on charge transfer in EPDM by calculating the change of key parameters such as carrier mobility in EPDM at different pressures. By designing a unipolar carrier blocking experiment and using the improved pulsed electro-acoustic (PEA) measurement device, we calculate the mobility of electrons in EPDM at six pressures between 0.2 MPa and1.2 MPa (at interval of 0.2 MPa). In addition, an analysis of the mobility with hopping conduction model shows that the mobility in EPDM does not change significantly with different pressures, and the electron transition distance and the required energy also have no obvious variations. It is concluded that under normal working conditions, pressures do not affect the electrical performance of EPDM.

Key words: EPDM, pressure, mobility, charge transport, space charge