Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

Chen, Qingguo; Liu, Heqian; Chi, Minghe; Wang, Yonghong; Wei, Xindong

doi:10.3390/ma10010090

Cited by 18 publications

(15 citation statements)

References 16 publications

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“…Specifically, the DC conductivity was inversely proportional to the trap charge and the breakdown strength was directly proportional to the trap level. Thus, the results of this study are in complete agreement with previous results [ 32 ]. In summary, SiC nanoparticles doping could improve the sensitive dependence of LSR to electric field stress and temperature changes while lowering the trap level and decreasing the number of carriers trapped.…”

Section: Resultssupporting

confidence: 93%

Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories

2018

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The conductivity mismatch in the composite insulation of high voltage direct current (HVDC) cable accessories causes electric field distribution distortion and even insulation breakdown. Therefore, a liquid silicone rubber (LSR) filled with SiC nanoparticles is prepared for the insulation of cable accessories. The micro-morphology of the SiC/LSR nanocomposites is observed by scanning electron microscopy, and their trap parameters are characterized using thermal stimulated current (TSC) tests. Moreover, the dielectric properties of SiC/LSR nanocomposites with different SiC concentrations are tested. The results show that the 3 wt % SiC/LSR sample has the best nonlinear conductivity, more than one order of magnitude higher than that of pure LSR with improved temperature and nonlinear conductivity coefficients. The relative permittivity increased 0.2 and dielectric loss factor increased 0.003, while its breakdown strength decreased 5 kV/mm compared to those of pure LSR. Moreover, the TSC results indicate the introduction of SiC nanoparticles reduced the trap level and trap density. Furthermore, the SiC nanoparticles filling significantly increased the sensitivity of LSR to electric field stress and temperature changes, enhancing the conductivity and electric field distribution within the HVDC cable accessories, thus improving the reliability of the HVDC cable accessories.

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Section: Resultssupporting

confidence: 93%

Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories

2018

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“…Furthermore, the nano-SiO 2 filling of the RIP affects the energy band structure of RIP. Based on our previous research, a simulated energy band structure for nano-modified pressboard is shown in Figure 14 [19]. The forbidden band of the RIP is wide and high, as shown in Figure 14a, which causes the low conductivity of non-modified RIP.…”

Section: Discussionmentioning

confidence: 99%

“…[14,15,16,17]. Chen et al found that nano-SiC particles induced obvious nonlinearity in the DC conductivity and DC electric field strength of oil-immersed insulated pressboard and that nano-Al 2 O 3 particles enhanced the AC and DC breakdown field strengths of oil-immersed insulated cardboard [18,19]. However, few studies have investigated nano-modified RIP composites.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Epoxy Resin Impregnated Nano-SiO2 Modified Insulating Paper

et al. 2019

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Epoxy resin-impregnated insulation paper (RIP) composites are used as the inner insulation of dry condenser bushing in the ultra-high voltage direct current (UHVDC) power transmission system. To improve the dielectric properties of RIP, nano-SiO2 is added to the insulation paper at concentrations of 0–4wt % before impregnation with pure epoxy resin. X-ray diffraction (XRD), scanning electron microscopy observations as well as the typical dielectric properties of relative permittivity, DC volume conductivity, DC breakdown strength, and thermally stimulated depolarization current (TSDC), were obtained. The effects of trap parameters on the breakdown field strength and volume conductivity were investigated. The DC breakdown electric field strength of the sample increased as the trap level increased. The maximum DC breakdown strength of nano-SiO2-modified RIP was increased by 10.6% the nano-SiO2 content of 2 wt %. The relative permittivity and DC volume conductivity were first decreased and then increased with increasing nano-SiO2 content. These changes occurred near the interfaces between nano-SiO2 and RIP. The increased DC breakdown strength was mainly attributed to the increased trap level.

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“…The range of frequency was 10 0 Hz–10 6 Hz. Before measuring conductivity, the dielectric spectrum, and breakdown of composites, samples needed to be short-circuited at 80 °C, which prevents the result of experiments from being affected by moisture and residual charge inside the sample [22,23,24]. …”

Section: Methodsmentioning

confidence: 99%

Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites

Zhao

Zhang

2018

Materials

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Researches of the theories and application of polymer composites with nonlinear conductivity are useful for dealing with the nonuniform electrical fields widely existing in the cable accessory insulation. In the present work, we fabricated CCTO (CaCu3Ti4O12)/EPDM (Ethylene Propylene Diene Monomer) composites and investigated their breakdown strength, dielectric and nonlinear conductivity properties in detail; the microstructures of fillers and composites were characterized by scanning electron microscopy (SEM) and X-ray diffraction. CCTO particles are uniformly dispersed in CCTO/EPDM composites, and the composites showed nonlinear conductivity with electric field changes. When the CCTO particle content is low, the conductivity of CCTO/EPDM composites does not present obvious nonlinearity. However, when CCTO content exceeds 2 vol %, the conductivity experiences a nonlinear change with increasing electric field strength and the threshold field (Eth) of nonlinear conductivity declines with the increase of CCTO contents. In addition, it can be found from experiment and simulation results that 8 vol % CCTO/EPDM exhibit significant nonlinear conductivity and dielectric properties as expected, and homogenizing the electrical field much more effectively. Therefore, this paper offers a preliminary discussion about the variation trend of nonlinear conductivity CCTO/EDPM composites, providing an effective reference to solve the application of nonlinear conductivity materials for cable accessories.

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Experimental Study on Influence of Trap Parameters on Dielectric Characteristics of Nano-Modified Insulation Pressboard

Cited by 18 publications

References 16 publications

Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories

Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories

Dielectric Properties of Epoxy Resin Impregnated Nano-SiO2 Modified Insulating Paper

Study on Nonlinear Conductivity of CCTO/EPDM Rubber Composites

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