Surface Flashover Characteristics of Nano-Composite Dielectric Materials Under DC and Pulsed Signals in Partial Vacuum

Serkan, M.; Kirkici, H.; Koppisetty, K.

doi:10.1109/modsym.2006.365188

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…It is useful to improve the flashover voltage of dielectric material. Some works have been done in epoxy resin (EP) [42][43][44][45][46][47][48][49][50].…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

“…Nanofillers can introduce deep traps into material whereas mircofillers bring shallow traps [49][50]52].That is to say, theoretically, it can improve the surface flashover voltage by optimizing the proportion of micro and nano particles co-doped. The [42,43], ◄ from [42,43], ★ from [42,43], ◆ from [44], ▲ from [45], ■ from [46], 〇 from [45,47], untreated;…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

See 1 more Smart Citation

Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

299

172

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Nanodielectrics, which are concentrated in polymer matrix incorporating nanofillers, have received considerable attention due to their potential benefits as dielectrics. In this paper, short-term breakdown and long-term failure properties of nanodielectrics have been reviewed. The characteristics of polymer matrix, types of nanoparticle and its content, and waveforms of the applied voltage are fully evaluated. In order to effectively comment on the published experimental data, a ratio k has been proposed to compare the electric properties of the nanodielectrics with the matrix and assess the effect for nanoparticles doping. There is evidence that the short-term breakdown properties of nanodielectrics show a strong dependence on the applied voltage waveforms. The polarity and the cohesive energy density (CED) of polymer matrix have a dramatic influence on the properties of nanodielectrics. Nanoparticle doped composites show a positive effect on the long-term failure properties, such as ageing resistance and partial discharge (PD) properties of nanocomposites are superior than microcomposites and the matrix. The larger the dielectric constant and CED of the matrix become, the more significant improvements in long-term performance appear. Based on the reported experimental results, we also present our understandings and propose some suggestions for further work.

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“…It is useful to improve the flashover voltage of dielectric material. Some works have been done in epoxy resin (EP) [42][43][44][45][46][47][48][49][50].…”

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

Section: Surface Flashover Characteristics Of Nanodielectric In Vacuummentioning

confidence: 99%

Short-term breakdown and long-term failure in nanodielectrics: a review

Yin

Chen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

299

172

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show abstract

“…When the concentration of SiO 2 -COOH continues to increase, the surface flashover voltage decreases slightly. The rationale is that by coating nanoparticles on the fiber surface, many deep traps will be introduced into the composite, allowing them to collect electrons and inhibit secondary electron emission on the surface, which will ultimately enhance the flashover voltage [25,26]. When the concentration of nano materials is too high to form aggregates, the adsorption capacity of aggregates to carriers is weakened, resulting in the increase in carrier mobility and the decrease in surface flashover voltage [27].…”

Section: Surface Flashover Voltagementioning

confidence: 99%

Effect of Nano-SiO2 Modification on Mechanical and Insulation Properties of Basalt Fiber Reinforced Composites

Liu

Sun

et al. 2022

Polymers

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Basalt fiber (BF) has high mechanical strength, good insulation performance and low cost. It is suitable to be used as reinforcement material in the manufacture of electrical equipment. However, the large surface inertia of basalt fiber makes it difficult to combine with the matrix material, which seriously limits its service life and application scenarios. In addition, the serious vacancy in the research of insulation properties also limits its production and application in the electrical field. Therefore, in order to solve the problem of difficult bonding between basalt fiber and resin matrix and make up for the research blank of basalt fiber composites in insulation performance, this paper provides a basalt fiber modification method—SiO2 coating, and tests the insulation and mechanical properties of the modified composite. We used nano-SiO2 coating solution to modify basalt fiber, and manufactured BF/resin composite (BFRP) by hand lay-up and hot-pressing technology, and experimentally analyzed the influence of nano-SiO2 content on the mechanical and insulation properties of the modified composite. Fourier transform infrared spectrum and scanning electron microscope analysis showed that nano-SiO2 was successfully coated on basalt fibers. Through the microdroplet debonding test, it was found that the IFSS of fiber/resin was improved by 35.15%, 72.97 and 18.9%, respectively, after the modification of the coating solution with SiO2 concentration of 0.5%, 1% and 1.5%, showing better interface properties; the single fiber tensile test found that the tensile strength of the modified fiber increased slightly. Among all composites, 1 wt% SiO2 coating modified composites showed the best comprehensive properties. The surface flashover voltage and breakdown field strength reached 13.12 kV and 33 kV/mm, respectively, which were 34.6% and 83% higher than unmodified composite. The dielectric loss is reduced to 1.43%, which is 33.8% lower than the dielectric loss (2.16%) of the untreated composite, showing better insulation ability; the tensile strength, bending strength and interlaminar shear strength were increased to 618.22 MPa, 834.74 MPa and 16.29 MPa, respectively, which were increased by 53%, 42.4% and 59.7%, compared with untreated composites. DMA and glass transition temperature showed that the modified composite had better heat resistance. TGA experiments showed that the resin content of the modified composite increased, and the internal structure of the composite became denser.

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“…Recently, polymer nanodielectrics have attracted considerable interest, since they exhibit not only favorable bulk electrical properties, e.g., good dielectric response, [22][23][24] high breakdown strength, [23][24][25] and reduced space charge accumulation, 26 but also present some favorable surface properties, such as reduced surface erosion, tracking failure 27 and surface flashover. [28][29][30][31] It should be noted that incorporation of nanofillers into a polymer or its micro composites is a potential choice likely to enhance surface flashover strength.…”

Section: Introductionmentioning

confidence: 99%

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Wang

Min

2016

AIP Advances

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This work studies the correlation between secondary electron emission (SEE) characteristics and impulse surface flashover in polyethylene nanodielectrics both theoretically and experimentally, and illustrates the enhancement of flashover voltage in low-density polyethylene (LDPE) through incorporating Al2O3 nanoparticles. SEE characteristics play key roles in surface charging and gas desorption during surface flashover. This work demonstrates that the presence of Al2O3 nanoparticles decreases the SEE coefficient of LDPE and enhances the impact energy at the equilibrium state of surface charging. These changes can be explained by the increase of surface roughness and of surface ionization energy, and the strong interaction between nanoparticles and the polymer dielectric matrix. The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive surface charges are reduced near the cathode triple point, while the presence of more nanoparticles in high loading samples enhances the gas desorption. Consequently, the surface flashover performance of LDPE/Al2O3 nanodielectrics is improved.

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Surface Flashover Characteristics of Nano-Composite Dielectric Materials Under DC and Pulsed Signals in Partial Vacuum

Cited by 6 publications

References 5 publications

Short-term breakdown and long-term failure in nanodielectrics: a review

Short-term breakdown and long-term failure in nanodielectrics: a review

Effect of Nano-SiO2 Modification on Mechanical and Insulation Properties of Basalt Fiber Reinforced Composites

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

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