Aging Effect on Interface Charges between Oil and Oil Immersed Paper

作者：Cheng, Chuanhui; Fu, Mingli; Wu, Kai^*; Ma, Yuntong; Hao, Yanpeng; Chen, Chi

来源：IEEE Transactions on Dielectrics and Electrical Insulation, 2021, 28(5): 1579-1587.

DOI：10.1109/TDEI.2021.009621

• Pulse measurements
• Oils
• Accelerated aging
• Aging
• Oil insulation
• Predictive models
• Thermal conductivity
• aging
• interface charge
• oil-paper insulation
• pulsed electro-acoustic method

This paper investigates the behavior of interface charges between oil and oil immersed paper insulations in unaged and aged samples. Combined accelerated thermal and electrical aging experiments of oil immersed paper insulations are conducted to obtain aged oil and aged paper samples. The interface charges between oil and paper samples with different aging status are measured with the Pulsed Electro-acoustic (PEA) method. Zeta potentials in samples with different aging status are determined. It is shown that the amount of interface charge increases with the aging duration, and does not follow the prediction of Maxwell-Wagner-Sillars (MWS) law. This is explained in terms of the increase of the interface charge barrier due to the effect of electric double layer. It is proposed that interface charge may act as an optional characterization parameter for the assessment of oil immersed paper insulations.

• 单位
  南方电网技术研究中心; 西安交通大学