AC and DC pre-stressed electrical trees in LDPE and its aluminum oxide nanocomposites

Chen, Xiangrong; Murdany, Deni; Liu, Dongming; Andersson, Mattias; Gubanski, Stanislaw; Gedde, Ulf W.; Suwarno, &

doi:10.1109/tdei.2016.005622

Cited by 24 publications

(17 citation statements)

References 28 publications

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“…For high voltage and ultra-high voltage polyethylene cables, electrical tree is the main factor leading to insulation failure [41]. In the electric field, contaminants (impurities) and defective structures (such as protrusions and voids) in polyethylene cables can distort the electric field, resulting in electrical damage, such as PD and electrical tree.…”

Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

“…In the electric field, contaminants (impurities) and defective structures (such as protrusions and voids) in polyethylene cables can distort the electric field, resulting in electrical damage, such as PD and electrical tree. Electric tree is a degradation process, which can cause irreversible structural damage of microns and above, and directly threaten the insulation strength of polyethylene [41,42]. Therefore, the self-healing of electrical tree can greatly improve the insulation performance and service life of polyethylene, but there are still few reports about it.…”

Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

“…Due to the large size of the electrical tree, the repair agent cannot completely repair the tubules of the electrical tree. However, the temperature and electric field coexist in the actual operation of polyethylene insulating material, and the propagation time of the actual electrical tree is longer [33,41], which provides a good opportunity for the repair behavior of the microcapsule. In other words, the repair agent in the microcapsule can begin to repair the electrical tree at the early stages of its propagation.…”

Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

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Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Wang

Zhang

et al. 2019

Applied Sciences

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Polyethylene cables, as important transmission equipment of modern power grid, would inevitably be slightly damaged, which seriously threatens the safety of the power supply. This paper has pioneered the preparation and typical performances of a self-healing polyethylene insulating composite. The self-healing performance to structural damage was verified by tests of electrical and mechanical damage. The effect mechanism of doping microcapsules on the electrical performance of polyethylene was emphatically analyzed. The results show that in appropriate conditions (such as 60 • C/30 min), the composite can not only repair the electrical tree and scratches, but also restore the insulation strength of damaged area. The effect of doping microcapsules on the electrical performances of polyethylene, such as breakdown strength, volumetric resistivity, dielectric properties, and space charge characteristics, are mainly related to impurity and the interface of microcapsule. Polarization and ionization of impurities can reduce the electrical performance of polyethylene. The interface not only improves the microstructure of polyethylene (such as how the heterogeneous nucleation effect increases the number of crystal regions, and the anchoring effect enhances the stability of amorphous regions), but also increases the charge traps. Moreover, the microstructure and charge trap can affect the characteristics of carrier transport, material polarization, and space charge accumulation, thus improving the electrical performance of polyethylene. In addition, the important electrical performance of the composite can meet the basic application requirements of polyethylene insulating material, which has good application prospects.

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Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

Section: Repair Effect Of Electrical Damagementioning

confidence: 99%

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Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Wang

Zhang

et al. 2019

Applied Sciences

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“…It is generally believed that a large number of homo-polar space charges will be injected into the insulation under DC pre-stress to form a space-charge shielding layer. Regarding extremely inhomogeneous electric fields, such as needle-plate electrode systems, space charges of the same polarity will homogenize the electric field at the tip of the needle, resulting in a significant increase of electrical tree initiation voltage [9], [10]. However, once stimulated by the surrounding environment, such as temperature increase, radiation, and sudden short-circuit grounding of the needle tip, the trapped space charge will de-trap quickly, releasing a large amount of mechanical electrical energy, and even lead to material breakdown [11].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

Liu

Liu³

et al. 2020

IEEE Access

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Space charge is one of the main causes of electrical tree initiation in high-voltage cable insulation. To investigate the influence of DC pre-stress on the space-charge distribution of cross-linked polyethylene (XLPE), a two-dimensional needle-plate electrode model is established in this study. Based on the bipolar charge-transport model, the space-charge distribution characteristics of the needle-plate electrode model under DC pre-stress are simulated and analyzed. The space-charge distribution characteristics are compared with that of the grounded DC electrical tree initiation properties. The work in this study illustrates that the pre-stress time and value affect the space-charge distribution characteristics. There is a certain relationship between space-charge distribution characteristics and electrical tree initiation characteristics. The distribution range of the DC grounded electrical tree is very similar to that of space charge. Both have a similar distribution shape and increased trend under different pre-stress times, and both have an obvious polarity effect. INDEX TERMS DC pre-stress, Grounded electrical tree, Space charge simulation, XLPE.

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“…As soon as the electrical tree is initiated, the electrical tree will grow continuously because of the partial discharge and thermodynamic effect. As a result, insulating materials will gradually age and ultimately break down, which reduces the lifespan of power equipment and power cables …”

Section: Introductionmentioning

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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AC and DC pre-stressed electrical trees in LDPE and its aluminum oxide nanocomposites

Cited by 24 publications

References 28 publications

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

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

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AC and DC pre-stressed electrical trees in LDPE and its aluminum oxide nanocomposites

Cited by 24 publications

References 28 publications

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Effect of Doping Microcapsules on Typical Electrical Performances of Self-Healing Polyethylene Insulating Composite

Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

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

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