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616 / 2022-03-30 19:02:51
Simulation of Space Charge in LDPE under AC Electric Field
Space charge
13. Aging, Space Charge, and Industrial Applications
终稿
Danyang Xie / 上海交通大学
Jiandong Wu / 上海交通大学
Fanfan Yang / 上海交通大学
Yi Yin / 上海交通大学
                                                                           Purpose/Aim

  Space charge accumulation is an important issue to be considered in power transmission systems. The numerical simulation of space charge under the AC field can qualitatively explain the source and transport law of the space charge. In this paper, the numerical simulation of the space charge transport process is carried out by setting the AC electric field conditions of different frequencies for low-density polyethylene (LDPE, Low Density Polyethylene) materials.

          Experimental/Modeling methods

   Electrode implantation adopts Schottky mode. The sample is equally divided in the thickness dimension. First find the charge distribution at the initial moment. Combined with the charge injection model, the electric field distribution under the condition of initial charge density is obtained by solving the Poisson equation. By solving the conduction equation, the charge space distribution under the electric field condition is obtained.

Results/discussion

   Space charges under the AC mainly concentrated on the surface side of the sample. There is almost no space charge accumulation on the sample surface at the 50Hz and above frequency electric field. Under the 0.1 Hz electric field, a small amount of same-polarity electrode charges appears on the surface side of the sample, and there is obvious charge hysteresis at the zero-crossing point of the electric field. Under the 0.01Hz electric field, the amount of charge accumulation increases significantly. The difference in charge accumulation at different frequencies may be related to inside traps of the sample.

Conclusions

    The results show that only under the low-frequency AC field, there is obvious space charge accumulation on the surface side of the sample, and the charge polarity is the same with the electrode electric field polarity. There is a charge hysteresis phenomenon at the zero-crossing point of the electric field. The above phenomenon may be related to inside traps of the medium.

Appendix (Figure, table, image…)



 
重要日期

  • 会议日期

    09月25日

    2022

    至

    09月29日

    2022

  • 08月15日 2022

    提前注册日期

  • 09月10日 2022

    报告提交截止日期

  • 11月10日 2022

    注册截止日期

  • 11月30日 2022

    初稿截稿日期

  • 11月30日 2022

    终稿截稿日期

主办单位
IEEE DEIS
承办单位
Chongqing University
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