Space charge characteristics of micron- and nano-BiFeO 3 /LDPE composites under a magnetic field
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Space charge characteristics of micron- and nanoBiFeO3/LDPE composites under a magnetic field Yuzhang Fan1, Wei Song1,* Bai Han1
, Lin Li2, Yu Hua3, Jiaming Yang1, Zhi Sun1, and
1
Ministry of Education, Harbin University of Science and Technology, Key Laboratory of Engineering Dielectric and Its Application, Harbin 150080, China 2 State Grid Heilongjiang Electric Power Company Limited Electric Power Research, Institute, Harbin 150040, China 3 Shenzhen Woer Heat-Shrinkable Material Co., Ltd., Shenzhen 518052, China
Received: 12 August 2020
ABSTRACT
Accepted: 5 November 2020
This paper mainly studies the effects of the composites which is low-density polyethylene (LDPE) modified by BiFeO3 powder on space charge characteristics under external magnetic field treatment. In comparison, the nano-BiFeO3 powder is irregular and small when the micron-BiFeO3 powder has regular shape and overlapping structure. XRD shows that BiFeO3 powders used in materials have pure phase. According to the DSC and magnetic properties, the saturation magnetization and crystallinity of the composites under the magnetic field treatment are significantly higher than that of pure LDPE. According to the space charge test, the space charge content in the composite is lower than that in the pure LDPE, when the space charge content of nano-composites is less than that in the micron-composites, and the space charge content is lower at 1 wt% concentration. Under the magnetic field treatment, the space charge distribution of the composites can be promoted; meanwhile, the electric field distribution of the composites can be more balanced. Overall, nano-composites has the best inhibition effect on space charge accumulation, followed by class B microncomposites. The inhibition effect of class A micron-composites is worst; electric field distribution is uneven at the same time.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Polyethylene material, as the most widely used insulation material today, has higher insulation performance, lower dielectric loss, and well mechanical properties. Although it has been used as a large number of insulated cable consumables in the past
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https://doi.org/10.1007/s10854-020-04846-x
few decades, the performance requirements of insulation materials are getting higher and higher with the development of ultra-high pressure. Ordinary polyethylene materials are difficult to meet the needs of the future development of power and electronics industries [1, 2]. The space charge problem inside the insulation materials has always become the key to
J Mater Sci: Mater Electron
restrict the development of DC cables. At present, international consensus has been reached that due to the distortion effect of space charge on the internal electric field distribution of insulating materials, space charge has a significant effect on various electrical properties, such as electrical conductivity, breakdown field strength, electrical aging, and
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