Tree characteristics in silicone rubber/SiO&lt;sub&gt;2&lt;/sub&gt; nanocomposites under low temperature

Du, B. X.; Han, Tao; Su, Jingang

doi:10.1109/tdei.2013.004140

Cited by 52 publications

(20 citation statements)

References 32 publications

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“…The continuous development of polymers and elastomers helps heat-shrinkable components to cover all cable technologies in low and medium voltage applications [5,6]. Together with the cables in the power network, the requirements of the heat-shrinkable accessories are similar with regard to service life and functionality [7][8][9]. According to the operation characteristics of the DC transmission system, insulating materials usually run under polarity reversal voltage [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of ambient temperature on surface charge and flashover of heat-shrinkable polymer under polarity reversal voltage

2016

IEEE Trans. Dielect. Electr. Insul.

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DC transmission helps to solve the decentralization of distributed wind power generation and other renewable power sources to enhance system performance. But the existence of surface charges by the corona makes earlier insulation failure and plays an important role during the development of the surface flashover. The influences of the ambient temperature and the polarity reversal voltage on the surface charge and the flashover of the heat-shrinkable polymer are not completely clear. In this paper, the carrier mobility and the volume conductivity were employed to explain the temperature dependent surface charge decay results. The initial surface charge density and decay rates served for analyzing the effects of polarity reversal voltage. Furthermore, the flashover experiments of the samples charged by the polarity reversal voltage at different ambient temperatures were conducted. Obtained results show that the descending speed of the surface charge becomes faster at higher temperature. An obvious temperature dependence of the carrier mobility and the volume conductivity is observed. Moreover, the surface charges of the samples charged by the voltage with shorter reversal time decay more rapidly. The flashover voltage increases with the increasing ambient temperature because of less accumulated surface charges in this condition. Considering the accelerated surface charge decay by the increasing temperature and easier charge accumulation during the steady negative period, attentions should be paid to the design of DC insulation and the security of operation.Index Terms -DC transmission and distribution equipment, ambient temperature, corona discharge, heat-shrinkable polymer, polarity reversal voltage, surface charge, flashover voltage.

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Section: Introductionmentioning

confidence: 99%

Effects of ambient temperature on surface charge and flashover of heat-shrinkable polymer under polarity reversal voltage

2016

IEEE Trans. Dielect. Electr. Insul.

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“…It could be concluded that the influence of aggregative state on aging processes was less obvious at cryogenic environment than that at room temperature [30]. It was revealed in our previous research that low temperature, frequency, and nanoparticles were important factors of the treeing process in Silicon Rubber (SiR) [31][32]. However, electrical tree behavior under repetitive pulse voltage and low temperature in the XLPE has not been studied.…”

Section: Introductionmentioning

confidence: 95%

Electrical tree characteristics of XLPE under repetitive pulse voltage in low temperature

Zhu

2015

IEEE Trans. Dielect. Electr. Insul.

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Cross-linked polyethylene (XLPE) may be operated under repetitive pulse voltage and low temperature environment. In recent years, many influencing factors to the treeing process, which is a main reason for the aging of XLPE have been researched. However, the tree behavior under repetitive pulse voltage and low temperature in XLPE is still not clear. In this paper, the tree behavior under repetitive pulse voltage and low temperature was investigated and analyzed. A positive pulse voltage with the amplitude of 12 kV and the frequency of 300 and 400 Hz was applied on the needle-plate electrodes. The experimental temperature was set to 30, -30, -90 and -196 °C. Four typical morphologies of the electrical trees are observed, including bush, branch, branch-pine and stagnated tree. It is revealed that low temperature has an obvious effect on tree structures and it can reduce the tree growth rate and extend the time to breakdown. It is also revealed that the tree inception probability becomes lower with the decrease of temperature. With the increase of pulse frequency, the tree growth rate, the fractal dimension and the number of tree channels increases and the tree inception probability becomes higher, but the morphologies of electrical trees stay the same.Index Terms -XLPE, repetitive pulse voltage, low temperature, electrical tree, tree inception, tree length, fractal dimension, dielectric breakdown.

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“…In order to analyze the mechanism, nanocomposites with different nanoparticles and different polymer matrixes were prepared, such as LDPE/ZnO nanocomposites, LDPE/SiO 2 nanocomposites, Epoxy/TiO 2 nanocomposites, Epoxy/POSS nanocomposites, and so on [7][8][9][10][11][12]. According to the research, it is concluded that the interface between nanoparticles and polymer matrix can dominate the characteristics of polymerbased nanocomposites [13][14][15][16][17][18]. On this basis, some interface models such as multicore model and space charge model have been proposed [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

Wang¹,

Wang²

2017

Properties and Applications of Polymer Dielectrics

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Pulsed electroacoustic (PEA) method, dielectric analyzer, and high resistance meter were used to research the DC breakdown, space charge behavior, permittivity, loss tangent, and volume resistivity of neat low density polyethylene (LDPE) and LDPE/MgO nanocomposites with concentration of 1, 3, and 5 wt% with and without the elongation ratio of 1.1. Results indicate that the DC breakdown strengths of neat LDPE and nanocomposites decrease after stretching. The heterocharges near electrodes in neat LDPE change to homocharges after stretching and a large amount of positive and negative charges accumulated in samples with concentration of 3 and 5 wt%. Meanwhile, homocharges near cathode electrode in nanocomposite with concentration of 1 wt% decrease a little and a small amount of positive charges were observed in the samples after stretching. Furthermore, there are different increases in amplitudes of permittivity in all the samples after stretching, as well as the loss of tangents especially in the frequency domain from 10 −1 to 10 2 Hz. The results of volume resistivity show that comparing with the nanocomposite with the concentration of 1 wt% whose volume resistivity decrease after stretching, larger volume resistivity is observed in neat LDPE and nanocomposites with the concentration of 3 and 5 wt%.

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Tree characteristics in silicone rubber/SiO<sub>2</sub> nanocomposites under low temperature

Cited by 52 publications

References 32 publications

Effects of ambient temperature on surface charge and flashover of heat-shrinkable polymer under polarity reversal voltage

Effects of ambient temperature on surface charge and flashover of heat-shrinkable polymer under polarity reversal voltage

Electrical tree characteristics of XLPE under repetitive pulse voltage in low temperature

Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

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