Comparing the Performance of γ-Alumina Nanofiller and Titanium Tetraisopropoxide Catalyst in the Rejuvenation of Water Tree Degraded XLPE Cables

Shirazi, Amir Hossein Merati; Hosseini, Seyedmohsen

doi:10.1007/s11664-019-07402-4

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…A strong stretching vibration peak of carbonyl (C=O) appears near 1700–1750 cm −1 . These results indicate that ketones, aldehydes, and esters are generated [25]. In the water‐tree area, the peak of hydroxyl stretching vibration ν OH and the peak of hydroxyl bending vibration δ OH of the sample continue to increase and widen, indicating that the hydroxyl content produced by hydro ionisation further increased.…”

Section: Resultsmentioning

confidence: 99%

“…The free radicals react with oxygen to form hydrogen peroxide radicals, which combine with the hydrogen atoms of other polymers to generate hydrogen peroxide and additional free radicals. Hydrogen peroxide continues to decompose, and the free radicals then react with oxygen to produce a large number of carbonyl groups and complete a free radical chain reaction [25]. This process is repeated to gradually deepen the ageing degradation in the local defect area of the sample.…”

Section: Resultsmentioning

confidence: 99%

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Study on the water‐tree ageing characteristics of polyethylene/organic montmorillonite and crosslinked polyethylene/organic montmorillonite nanocomposites

Yang²,

Wang

et al. 2022

High Voltage

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The dispersion state of nanoparticles affects the properties of composites, and the crosslinking process of polymers affects the dispersion state of nanoparticles. In order to investigate the effects of crosslinking behaviour on the water-tree ageing characteristics of nanocomposite dielectrics at the molecular level, polyethylene/organic-montmorillonite (PE/organic montmorillonite (OMMT)) and crosslinked polyethylene/organic-montmorillonite (XLPE/OMMT) nanocomposites were prepared by the melt blending method, after which the accelerated water-tree ageing experiments were conducted using a needle electrode. Fourier transform infrared spectroscopy, differential scanning calorimetry, successive self-nucleation annealing and scanning electron microscope (SEM) tests were conducted to characterise the properties of the samples before and after watertree ageing. The results indicate that the initiation probability and the length of water trees in XLPE/OMMT are less than those in PE/OMMT. The carbonyl index in the watertree area of the two nanocomposites increases, indicating that the water-tree ageing is the result of electrochemical degradation. The crystallisability of the water-tree area degrades, decreasing the crystallinity and the lamellar thickness. The growth of water trees destroys molecular chains and crystal structures, which results in local cracks. There are many holes for the water tree growth in the PE/OMMT specimen. However, the crosslinked meshwork not only restricts the movement of macromolecular chains but also increases the stability of the lamellar barrier effect of OMMT. The combination of the two effects significantly improves the water-tree resistance of the XLPE/OMMT nanocomposite.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Study on the water‐tree ageing characteristics of polyethylene/organic montmorillonite and crosslinked polyethylene/organic montmorillonite nanocomposites

Yang²,

Wang

et al. 2022

High Voltage

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“…In injection cable rejuvenation technology, the selection of an appropriate rejuvenation fluid formula is a critical factor influencing the effectiveness of rejuvenation. Currently, commonly used rejuvenation IOP Publishing doi:10.1088/1742-6596/2731/1/012013 2 fluid formulations include Phenylmethyldimethoxysilane (PMDMS) [2], and Diphenyldimethoxysilane (DPDMS) proposed by Hirazi A and Hosseini S H [3], McCary J L et al proposed Tolylethylmethyldimethoxysilane (TEM) and Cyanoalkylmethyldimethoxysilane (CAM) [4], as well as Trimethylmethoxysilane (TMMS) that can be used to improve the diffusion performance of rejuvenation fluids [5].…”

Section: Introductionmentioning

confidence: 99%

Study on the Selection of Power Cable Rejuvenation Fluids Based on Relative Diffusion Coefficients

Tao,

Deng,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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The present work presents and formulates a method for calculating the relative diffusion coefficient of rejuvenation fluid in injection cable rejuvenation technology, and the permeability characteristics of rejuvenation fluid in polyethylene insulation materials are calculated and compared. The main components of the rejuvenation fluid such as (Phenylmethyl-dimethoxysilane) PMDMS, (Diphenyldimethoxysilane) DPDMS and (Trimethylmethoxysilane) TMMS, and the catalysts such as (Tetra-isopropyl titanate) TIPT and (Tetra-isobutyl titanate) TIBT were analysed in depth. The article uses theoretical calculation method, combined with Helmroth and Limm-Hollifield models, to calculate the diffusion coefficients and relative diffusion coefficients of these compounds in polyethylene. Through comparative analysis of theoretical calculations, the optimal parameters for evaluating the permeability characteristics of rejuvenation fluids were determined. The research results show that TMMS has the best permeability characteristics in polyethylene, followed by PMDMS and DPDMS. In the catalyst, TIPT has better permeability characteristics than TIBT. And when selecting the composite formula for cable rejuvenation fluid, it is more convenient to use the relative diffusion coefficient as an index of diffusion characteristics. This research provides important theoretical basis and practical guidance for the formulation selection of cable rejuvenation fluids.

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Potential Applications of XLPE Nanocomposites in the Field of Cable Insulation

Rajendran

Vidya

Joseph

et al. 2021

Materials Horizons: From Nature to Nanomaterials

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Comparing the Performance of γ-Alumina Nanofiller and Titanium Tetraisopropoxide Catalyst in the Rejuvenation of Water Tree Degraded XLPE Cables

Cited by 7 publications

References 17 publications

Study on the water‐tree ageing characteristics of polyethylene/organic montmorillonite and crosslinked polyethylene/organic montmorillonite nanocomposites

Study on the water‐tree ageing characteristics of polyethylene/organic montmorillonite and crosslinked polyethylene/organic montmorillonite nanocomposites

Study on the Selection of Power Cable Rejuvenation Fluids Based on Relative Diffusion Coefficients

Potential Applications of XLPE Nanocomposites in the Field of Cable Insulation

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