Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 31, Issue 19, Pages 16819-16829Publisher
SPRINGER
DOI: 10.1007/s10854-020-04236-3
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Funding
- National Key Research and Development Program of China [2017YFB0902704]
- National Natural Science Foundation of China [51877056]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2016159]
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In order to solve the problem of space charge accumulation in high-voltage DC cable accessories, nanometer titanium dioxide (TiO2) doping method is used to improve the space charge performance of liquid silicone rubber (LSR). Conductivity, dielectric spectrum and DC breakdown field strength, space charge distribution, and the trap level distribution of nano-TiO2/LSR composite samples were tested in this paper. With the increase of the doping concentration of nanoparticles, the DC conductivity increased, and the DC breakdown field strength decreased. The epsilon(r)of the TiO2/LSR composite sample increased with the increase in the doping concentration of nano-TiO2. As the frequency increased, tan delta decreased first in the low-frequency region and then increased in the high frequency. When the electric field strength increases from 10 to 20 kV/mm, the same polarity charges appear near the upper and lower electrodes of the sample, and the space charge accumulation doubled. After the addition of nano-TiO2, under the two electric field strengths, the space charge accumulation of 4 wt%-TiO2/LSR composite materials decreased by 24.55 nc and 81.03 nc, respectively. The trap energy level of the 4 wt% nano-TiO(2)composites becomes smaller, and shallow traps are introduced, it was verified that the addition of 4 wt% nano-TiO(2)particles reduced the space charge inside the composite sample and achieved the effect of suppressing space charge.
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