Time-evolution phenomena of electrical tree partial discharges in Magnesia, Silica and Alumina epoxy nanocomposites

Nyamupangedengu, Cuthbert; Cornish, D. R.

doi:10.1109/tdei.2015.005055

Cited by 18 publications

(7 citation statements)

References 25 publications

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“…An in-depth understanding of the chemical processes accompanying interfacial tracking (and electrical tree formation into the bulk) is therefore increasingly important for the development of insulator materials with enhanced resistance to breakdown. 4,5,6,7,8 Despite numerous efforts to characterise polymeric degradation by electrical discharge however, the mechanisms involved remain poorly defined. Previously, electron spin resonance (ESR) measurements have been used to demonstrate that radical species are active during electrical tree formation in bulk polyethylene.…”

Section: Introductionmentioning

confidence: 99%

AFM-IR insights into the chemistry of interfacial tracking

2017

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Section: Introductionmentioning

confidence: 99%

AFM-IR insights into the chemistry of interfacial tracking

2017

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“…POLYMER nanocomposite materials, i.e., host polymer materials with guest nano-sized inorganic particles, have attracted much attention for their superior insulating performances, such as the improvement of the intrinsic breakdown strength [1,2], the suppression of the electrical tree propagation [3,4] and the enhancement of partial discharge (PD) resistance [5]. Previous researches have shown that the dielectric and the insulation properties of nanocomposites are strongly influenced not only by the material of the particles but also by the volume content (or weight percent) of nanoparticles [6,7] and the particle dispersion condition [8].…”

Section: Introductionmentioning

confidence: 99%

“…There are three typical insulation defects: metallic protrusions, metallic particles, and enclosed voids. The metallic protrusion and the particle can be modeled as a needle electrode, and the effectiveness of nanocomposites in improving the breakdown strength initiated from the tip of the needle has been clarified by many previous studies [3,4,7]. Although the insulation lifetime properties of nanocomposites with the metallic protrusions or particles are important and should be investigated in our future work, these contaminations can be removed to some extent by improving the manufacturing process.…”

Section: Introductionmentioning

confidence: 99%

Critical Agglomerate Size for Electrical Insulation Lifetime Extension of Epoxy/TiO₂ Nanocomposite with a Void Defect

Umemoto

Yoshida

Muto

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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This study investigates the time to breakdown of epoxy/TiO 2 nanocomposites with a void defect. In the tests, partial discharge (PD) is continuously monitored to clarify the degradation of the nanocomposites. In evaluating the dependence of the maximum agglomerate size and the volume fractions of the TiO 2 particles, it is found that the agglomerate size, rather than the volume fractions, dominates the electrical insulation lifetime of the nanocomposites. Furthermore, the lifetime increases drastically when the agglomerate size exceeds a critical value. The continuous PD signal monitoring reveals that the lifetime extension of the nanocomposites is achieved due to delaying the electrical tree propagation in the nanocomposite, rather than extensions of the times required for the transition from the void discharges to the tree initiation.

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“…Alapati and Thomas [16] have reported significant reduction in PD magnitude and repetition rate of LDPE nanocomposites than unfilled one from the electrical tree initiation to breakdown. Nyamupangedengu and Cornish [17] have shown distinct classes of PRPD pattern as the electrical tree growth reaches breakdown in epoxy nanocomposites and they have also reported less PD magnitude in nanocomposites than unfilled one.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Tree Growth of XLPE Nano Composites using Time–Frequency Map and Clustering Analysis of PD Signals

Purushotham¹,

Chandrasekar²,

Montanari

2020

J. Electr. Eng. Technol.

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Failure of underground cables due to electrical treeing phenomena, i.e. formation of electrical discharges in the imperfections of cable insulation, is a major problem faced by electrical utilities. Many research works on nanocomposites are being carried out to improve the electrical treeing resistance of the XLPE cable insulation material. Technological advancements in communication and data analytic systems have shown the way for implementing online continuous partial discharge (PD) monitoring systems for high voltage apparatus. Hence collection of PD database of XLPE nanocomposites in the laboratory during entire electrical tree growth process is important for implementing efficient condition monitoring systems and relatively little work has been published in this area. In this work, PD characteristics of XLPE nanocomposites with 1, 3, 5 and 10 wt% silica were investigated. Electrical tree growth and corresponding phase resolved PD (PRPD) pattern were analysed with respect to time. Cluster analysis of equivalent time-frequency mapping of PD signals was carried out with respect to tree growth time period. Statistical analysis was performed for the entire set of PD data. Results show that cluster analysis of T-F map of PD data is useful in estimating early failure of insulating material due to treeing. Addition of silica nano fillers in the range of 3-5 wt% concentration significantly improves the PD resistance and breakdown time of XLPE material.

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Time-evolution phenomena of electrical tree partial discharges in Magnesia, Silica and Alumina epoxy nanocomposites

Cited by 18 publications

References 25 publications

AFM-IR insights into the chemistry of interfacial tracking

AFM-IR insights into the chemistry of interfacial tracking

Critical Agglomerate Size for Electrical Insulation Lifetime Extension of Epoxy/TiO₂ Nanocomposite with a Void Defect

Investigation of Electrical Tree Growth of XLPE Nano Composites using Time–Frequency Map and Clustering Analysis of PD Signals

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Time-evolution phenomena of electrical tree partial discharges in Magnesia, Silica and Alumina epoxy nanocomposites

Cited by 18 publications

References 25 publications

AFM-IR insights into the chemistry of interfacial tracking

AFM-IR insights into the chemistry of interfacial tracking

Critical Agglomerate Size for Electrical Insulation Lifetime Extension of Epoxy/TiO2 Nanocomposite with a Void Defect

Investigation of Electrical Tree Growth of XLPE Nano Composites using Time–Frequency Map and Clustering Analysis of PD Signals

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Product

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Critical Agglomerate Size for Electrical Insulation Lifetime Extension of Epoxy/TiO₂ Nanocomposite with a Void Defect