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Effect of Thermal Aging on Electrical Properties of Low Density Polyethylene

  • Wang, Can (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University Chongqing) ;
  • Xie, Yaoheng (State Grid Hunan Electrical Power Company Limited Research Institute) ;
  • Pan, Hua (State Grid Hunan Electrical Power Company Limited) ;
  • Wang, Youyuan (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University Chongqing)
  • Received : 2017.12.05
  • Accepted : 2018.05.10
  • Published : 2018.11.01

Abstract

The thermal degradation of low density polyethylene (LDPE) will accelerate the production of carbonyl groups (C=O), which can act as the induced dipoles under high voltage. In this paper, we researched the dielectric properties and space charge behavior of LDPE after thermal aging, which can help us to understand the correlation between carbonyl groups (C=O) and electrical properties of LDPE. The spectra results show that LDPE exhibit obvious thermooxidative reactions when the aging time is 35 days and the productions mainly contain carboxylic acid, carboxylic eater and carboxylic anhydride, whose amount increase with the increasing of aging time. The dielectric properties show that the real permittivity of LDPE is inversely proportional to temperature before aging and subsequently become proportional to temperature after thermal aging. Furthermore, both the real and imaginary permittivity increase sharply with the increasing of aging time. The fitting results of imaginary permittivity show that DC conductivity become more sensitive about temperature after thermal aging. On this basis, the active energies of materials calculated from DC conductivity increase first and then decrease with the increasing of aging time. In addition, the space charge results show that the heterocharges accumulated near electrodes in LDPE change to the homocharges after thermal aging and the mean volume charge density increase with the increasing of aging time. It is considered that the overlaps caused by electrical potential area is the main reason for the increase of DC conductivity.

Acknowledgement

Supported by : Electric Power Research Institute

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