Nonlinear conductivity and charge transport characteristics of silicone rubber/SiC composites under impulse superimposed on DC voltage

Kong, Xiaoxiao; Yang, Zhiduan; Li, Zhonglei; Li, J.

doi:10.1109/tdei.2018.007717

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…Therefore, this work uses positive‐to‐negative voltage as an example to illustrate the influence of ambient temperature on the charge transport characteristics. According to the previous research [18], it can be found that a lower initial surface potential occurs at 70°C than that at 30°C. At 90°C, the initial surface potential of the sample is further reduced.…”

Section: Resultsmentioning

confidence: 81%

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Effect of polarity‐reversal voltage on charge accumulation and carrier mobility in silicone rubber/silicon carbide composites

Han

Xiao

et al. 2021

IET Science Measure & Tech

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Polarity‐reversal voltage in high‐voltage direct current transmission system would cause serious electric field distortion, accelerating charge injection. The effect of polarity reversal on charge transport characteristics in silicone rubber (SiR)/silicon carbide (SiC) composites with nonlinear conductivity at different temperatures is studied. The charge transport characteristics of silicone rubber/silicon carbide composites under unipolarity voltage and polarity‐reversal voltage at 30°C, 70°C and 90°C are obtained by the isothermal surface potential decay method, and the carrier mobility and trap characteristics of the composites are further calculated. Studies have shown that a large amount of hetero‐charge remains in silicone rubber materials under polarity‐reversal voltage, which in turn leads to intensive charge neutralisation and severe electric field distortion. The silicon carbide doped composites exhibit excellent performance in suppressing the accumulation of residual charges and weakening the charge neutralisation under polarity‐reversal voltage. In addition, high temperature enhances the conductivity of silicone rubber/silicon carbide composites and reduces the accumulation of residual charges, which restrains the distortion of the local electric field under polarity‐reversal voltage. This research shows that the application of non‐linear conductivity material is an effective measure to solve the problem of cable insulation under polarity‐reversal voltage.

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Section: Resultsmentioning

confidence: 81%

“…The surface charge characteristics of the samples are measured by the surface charge measurement system shown in Figure 2(a) [18]. This work uses DC voltage sources with opposite polarities, and the voltage is increased to 5 kV with a ramp rate of 1 kV/s.…”

Section: Surface Potential Measurementmentioning

confidence: 99%

Effect of polarity‐reversal voltage on charge accumulation and carrier mobility in silicone rubber/silicon carbide composites

Han

Xiao

et al. 2021

IET Science Measure & Tech

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show abstract

“…As a result, they emphasized that superposition of DC voltage and impulse voltage may be a critical situation for HVDC GIL if free conductive particles are present. In addition to these studies, the behavior of electrical treeing [17][18][19][20][21] and electrical properties [22][23][24] in solid insulating materials has been observed in recent years under superimposed DC and impulse high voltage.…”

Section: Introductionmentioning

confidence: 99%

The Effect of DC Voltage Pre-Stress on the Breakdown Voltage of Air under Composite DC and LI Voltage and Test Circuit: Design and Application

et al. 2022

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The use of HVDC systems is increasing in number due to technological innovations, increasing power capacity and increasing customer demand. The characteristics of insulation systems under composite DC and LI voltage must be examined and clarified. In this study, firstly, experimental circuits were designed to generate and measure composite DC and LI high voltage using a simulation program. The coupling elements used were chosen according to simulation results. Afterward, experimental circuits were established in the laboratory according to the simulation results of the designed experimental circuit. Then, breakdown voltages under composite DC and LI voltage for less uniform and non-uniform electric fields were measured with four different electrode systems for positive and negative DC voltage pre-stresses with different amplitudes. The 50% breakdown voltage was calculated using the least-squares method. Finally, 3D models were created for the electrode systems used in the experiments using the finite element method. The efficiency factors of electrode systems calculated with the FEM results were correlated with the experimental breakdown voltage results. Thus, the breakdown behavior of air under bipolar and unipolar composite voltages (CV) was investigated. In conclusion, the experimental results showed that very fast polarity change in bipolar CV causes higher electrical stress compared to unipolar CV.

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Modulation of anti-corona properties by ZnO nanoparticles and SiO2 nanoparticles

Guo,

Dong,

Wang

et al. 2024

J Mater Sci: Mater Electron

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Nonlinear conductivity and charge transport characteristics of silicone rubber/SiC composites under impulse superimposed on DC voltage

Cited by 11 publications

References 22 publications

Effect of polarity‐reversal voltage on charge accumulation and carrier mobility in silicone rubber/silicon carbide composites

Effect of polarity‐reversal voltage on charge accumulation and carrier mobility in silicone rubber/silicon carbide composites

The Effect of DC Voltage Pre-Stress on the Breakdown Voltage of Air under Composite DC and LI Voltage and Test Circuit: Design and Application

Modulation of anti-corona properties by ZnO nanoparticles and SiO2 nanoparticles

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