Investigation on electrical tree propagation in polyethylene based on etching method

Shi, Zexiang; Zhang, Xiaohong; Wang, Kun; Gao, Junguo; Guo, Ning

doi:10.1063/1.4994941

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…LDPE is typical of semicrystalline polymers, and the electrical tree growth characteristics are influenced by the complex nonuniform state of the aggregation structure in LDPE, such as crystallinity, crystal morphology, and crystal size . The crystals in the semicrystalline polymer materials hinder the development path of the electrical tree because of their characteristics of compact structure, purity, and brittleness.…”

Section: Resultsmentioning

confidence: 99%

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites

Zhang

Shi

et al. 2019

J of Applied Polymer Sci

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Montmorillonite (MMT)/low-density polyethylene (LDPE) nanocomposites have excellent partial discharge resistance and electrical tree resistance compared with pure LDPE. However, the MMT/LDPE nanocomposites have low breakdown strength due to the poor compatibility between nano-MMT and LDPE. In order to improve the breakdown strength of the MMT/LDPE composites without changing the LDPE matrix, an MMT/SiO 2 /LDPE multielement composite was prepared by melt blending, and its breakdown strength and electrical tree resistance properties were investigated. The results show that the MMT/SiO 2 /LDPE multielement composite has excellent breakdown strength and electrical tree resistance properties compared with the MMT/LDPE composite. The reasons for the excellent insulation properties of the MMT/SiO 2 /LDPE multielement composites were analyzed by exploring the effects of MMT and SiO 2 on the microstructure and trap characteristics of LDPE.

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Section: Resultsmentioning

confidence: 99%

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites

Zhang

Shi

et al. 2019

J of Applied Polymer Sci

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“…The breakdown strength is higher in the case of a small difference in density between crystalline lamellae and amorphous parts [16]. Improving the crystal structure of LDPE and the stacking density of lamellae in spherulites is an effective method to inhibit the growth of electrical tree [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Crystalline Morphology on Electrical Tree Growth Characteristics of High-Density and Low-Density Polyethylene Blend Insulation

Zhou

Fan

et al. 2020

IEEE Access

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The electrical tree initiation and propagation behaviors are a key issue for the polyethylenebased cable insulation. This paper focuses on the effect of crystalline morphology on electrical tree growth characteristics of high-density and low-density polyethylene (HDPE/LDPE) blend insulation. In this paper, the electrical tree growth characteristics of HDPE/LDPE blends with HDPE mass fractions of 0, 10, 15, 20 wt% are investigated under repetitive impulse voltage at 40, 60, 80 °C. It is found that with the rise of HDPE content from 0 to 15 wt%, the growth rate and accumulated damage of electrical tree decreases, with the morphology of electrical tree tending to bush tree. The increasing of voltage amplitude improves the energy of injected charge while the temperature rise leads to the relaxation of molecular chain, which both result in the promotion of collision ionization, thus increasing the density of electrical tree. Compared with branch tree, bush tree illustrates better inhibition of discharge tracks due to uniform electric field at the end of branches. The crystalline characteristics of HDPE/LDPE blends indicate that the crystallinity increases with the addition of HDPE, and the blend comprising 15 wt% HDPE in an LDPE matrix apparently reduces the average size of spherulites and improves the distribution of spherulites evenly. The upsurge of crystalamorphous interface leads to the increase of deep trap energy level density and the decrease of carrier mobility. Carrier injection and migration at the interface between crystalline and amorphous regions are restrained, thus inhibiting the growth of electrical tree. It is concluded that the crystalline morphology modified by polymer blending has a significant effect on the electrical tree growth characteristics.

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Effect of nucleating agents on the electrical properties of cross‐linked polyethylene under tensile stress

Xing,

Liu,

et al. 2023

High Voltage

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During the operation of high‐voltage cables, external stress and residual stress can affect the aggregated structure of insulating materials and lead to significant deterioration in their electrical performance. To investigate the evolution characteristics of the electrical properties of cross‐linked polyethylene (XLPE) under mechanical stress, this paper explains the relationship between the aggregated structure of XLPE and its electrical properties and proposes a method for improving insulation performance under mechanical stress. The results show that metallocene polyethylene used as a nucleating agent can promote crystallisation through heterogeneous nucleation and increase Young's modulus by non‐uniform nucleation, increasing crystallinity and reducing interplanar spacing, resulting in more complete crystal forms and reduced damage to the aggregated structure during the tensile process. After nucleating agent modification, the XLPE crystallisation becomes more uniform, and interfacial adhesion forces increase. The weakened interface damage process between the amorphous and crystalline regions under tensile stress effectively inhibits the process of molecular chain polarisation turning and reduces trap density. The modified XLPE crystal structure shows a tendency towards densification and enhanced molecular chain interactions, which can reduce the damage to the aggregated structure under tensile stress, while the reduced free volume inside the material and the shortened average free path of carriers can weaken the damage of high‐energy electrons to molecular chains, thereby inhibiting the process of electrical tree degradation. The results show that nucleating agents have great potential for maintaining the stable operation of XLPE cables under mechanical stress.

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Investigation on electrical tree propagation in polyethylene based on etching method

Cited by 4 publications

References 12 publications

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites

Effect of Crystalline Morphology on Electrical Tree Growth Characteristics of High-Density and Low-Density Polyethylene Blend Insulation

Effect of nucleating agents on the electrical properties of cross‐linked polyethylene under tensile stress

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Investigation on electrical tree propagation in polyethylene based on etching method

Cited by 4 publications

References 12 publications

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO2/LDPE multielement composites

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO2/LDPE multielement composites

Effect of Crystalline Morphology on Electrical Tree Growth Characteristics of High-Density and Low-Density Polyethylene Blend Insulation

Effect of nucleating agents on the electrical properties of cross‐linked polyethylene under tensile stress

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Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites

Enhanced breakdown strength and electrical tree resistance properties of MMT/SiO₂/LDPE multielement composites