Dynamic characteristics analysis on interface polarization and depolarization of nonlinear double-layered dielectrics

Suo, Changyou; Li, Zhonghua; Zheng, Huan; Sun, Yunlong

doi:10.1109/tdei.2017.006202

Cited by 7 publications

(8 citation statements)

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“…The maximum of the relaxation strength locates at 70 °C, which is close to the glass transition temperature ( T g ). The influence of interfacial polarization strength is attributed to the difference of conductivity and permittivity between fillers and matrix [ 19 ]. The phase change of epoxy resin takes place near the T g , leading to the drastic increasing of conductivity and permittivity.…”

Section: Resultsmentioning

confidence: 99%

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

et al. 2020

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Utilizing liquid rubber to toughen epoxy resin is one of the most mature and promising methods. However, the dielectric relaxation characteristics of the epoxy/liquid rubber composites have not been studied systematically, while the relaxation behaviours are a critical factor for both micro and macro properties. In this paper, hydroxyl-terminated liquid nitrile rubber (HTBN) is employed to reinforce a kind of room-temperature-cured epoxy resin. The dielectric spectrum is measured and analysed. Results show that two relaxation processes are introduced in the binary composites. The α relaxation of HTBN shows a similar temperature dependence with the β relaxation of epoxy resin. The interfacial polarization leads to an increase of complex permittivity, which reaches its maximum at 70 °C. In addition, affected by interfacial polarization, the thermionic polarization is inhibited, and the samples with filler ratios of 15% and 25% show lower DC-conductivity below 150 °C. In addition, the α relaxation and thermionic polarization of epoxy resin obey the Vogel‒Fulcher‒Tammann law, while the interfacial polarization and DC-conductivity satisfy with the Arrhenius law. Furthermore, the fitting results of the Vogel temperature of α relaxation, glass transition temperature, apparent activation energy of interfacial polarization and DC-conductivity all decline with HTBN content. These results can provide a reference and theoretical guidance for the assessment of dielectric properties and the improvement of the formulation of liquid-rubber-toughened epoxy resin.

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Section: Resultsmentioning

confidence: 99%

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

et al. 2020

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“…The voltage distribution in OPCI under ramp DC voltage is described with the proposed model (see Figure 7). When the positive DC voltage increases linearly at a rate of 500 V/s, the distribution voltages in both oil ( u o ) and OIP ( u p ) should satisfy () [22]

\{\begin{matrix} right leftthickmathspace.5em \\ C_{o} \frac{normald u_{o}}{normald t} + \frac{u_{normalo}}{R_{normalo}} + {false\sum}_{j = 1}^{m} (][, \frac{u_{normalo}}{R_{o j}} - \frac{e^{- (t / R_{normalo j} C_{normalo j})} \int u_{normalo} {normale}^{t / R_{o j} C_{o j}} d t}{R_{normalo j}^{2} C_{normalo j}}) = i_{o} \\ C_{p} \frac{normald u_{p}}{normald t} + \frac{u_{normalp}}{R_{normalp}} + {false\sum}_{k = 1}^{n} (][, \frac{u_{normalp}}{R_{p k}} - \frac{e^{- (t / R_{normalp k} C_{normalp k})} \int u_{normalp} e^{t / R_{p k} C_{p k}} d t}{R_{normalp k}^{2}}) \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

Section: Voltage Distribution and Breakdown Strengthmentioning

confidence: 99%

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Enhanced voltage distribution and breakdown strength performances of oil‐paper composite insulation by adding TiO ₂ nanoparticles

et al. 2020

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Oil-paper composite insulation (OPCI) is used as the main insulation material in the converter transformer. However, the dielectric properties of insulating oil and oil-impregnated paper are markedly mismatched under direct current (DC) voltage, resulting in an unbalanced distribution of voltage, which is considered to be a major cause of large insulation margin but frequent failures. Therefore, it is necessary to adjust the voltage distribution in OPCI to enhance its breakdown strength. In this work, surface-treated TiO 2 nanoparticles were employed to modify OPCI. The polarisation current tests revealed that by changing the additive amount of nanoparticles, the polarisation intensities of both oil and oil-impregnated paper could be adjusted. Based on this, a model taking relaxation polarisations into full consideration was established to analyse the voltage distribution in OPCI and predict the optimal concentration. The prepared OPCI with the concentration of 0.02 g/L has desired balanced voltage distribution due to the influence of nanoparticles on interface charge, and therefore high breakdown strengths under both DC voltage and polarity reversal voltage, which can be increased by 22.6% at most. This work puts forward a novel idea to improve insulation property of OPCI and provides a reference for broader application of nanomaterial in power equipment. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Theoretical analysis of Maxwell–Wagner polarisation based on linear double‐layered dielectrics under step voltage is derived based on the electromagnetic theory, and the analytical expression of the transient electric field intensity and the interfacial charge density is recorded in classical books [33]. Theoretical study of the interfacial polarisation for non‐linear double‐layer dielectrics under step voltage was also reported [34]. However, the classical theory of Maxwell–Wagner polarisation cannot be directly applied to the transient electric field analysis of the composite insulation structure under the PPSW voltage.…”

Section: Introductionmentioning

confidence: 99%

Transient electric field of the combined insulation structure under positive periodic square waveform voltage: Analytical analysis and application

Wen

Cui

et al. 2022

High Voltage

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The working voltage of the high‐voltage high‐power electronic devices is the positive periodic square waveform (PPSW) voltage, which is much different from the conventional AC or DC voltage. For the composite insulation structure of devices, it is important to analyse the transient electric field under the PPSW voltage. However, the existing investigations are often conducted under the electrostatic field due to the high frequency of the PPSW voltage. Thus, the transient characteristics of the electric field are missed. To obtain some qualitative conclusions, this paper focusses on the theoretical analysis of the transient characteristics of electric field for the composite insulation structure under the PPSW voltage. First, the formula of the electric field intensity and the interfacial charge density are derived analytically. Second, the influence of the cycle and the duty cycle on the transient characteristics are investigated. Third, the maximum of the electric field intensity and the interfacial charge density in the positive square waveform steady‐state are discussed in detail. Besides, the engineering calculation methods for obtaining these maximum values are also suggested. Lastly, an actual model is employed to testify the validity of the analytical analysis. This work is significant for the numerical calculation of the transient electric field of composite insulation structure under the PPSW voltage in engineering.

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Dynamic characteristics analysis on interface polarization and depolarization of nonlinear double-layered dielectrics

Cited by 7 publications

References 23 publications

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

Enhanced voltage distribution and breakdown strength performances of oil‐paper composite insulation by adding TiO ₂ nanoparticles

Transient electric field of the combined insulation structure under positive periodic square waveform voltage: Analytical analysis and application

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Dynamic characteristics analysis on interface polarization and depolarization of nonlinear double-layered dielectrics

Cited by 7 publications

References 23 publications

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

Dielectric Relaxation Characteristics of Epoxy Resin Modified with Hydroxyl-Terminated Nitrile Rubber

Enhanced voltage distribution and breakdown strength performances of oil‐paper composite insulation by adding TiO 2 nanoparticles

Transient electric field of the combined insulation structure under positive periodic square waveform voltage: Analytical analysis and application

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Enhanced voltage distribution and breakdown strength performances of oil‐paper composite insulation by adding TiO ₂ nanoparticles