Use of Grafted Voltage Stabilizer to Enhance Dielectric Strength of Cross-Linked Polyethylene

Dong, Wei; Wang, Xuan; Tian, Bo; Liu, Yuguang; Zhu, Jiang; Li, Zhigang; Zhou, Wei

doi:10.3390/polym11010176

Cited by 21 publications

(10 citation statements)

References 31 publications

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“…A commercial voltage breakdown tester (DDJ-100 kV, Guance Precision Electric Instrument Equipment Co. Ltd., Beijing, China) was used to measure the dielectric breakdown strength of XLPE/α-Al 2 O 3 [31]. As shown in Figure 2, two spherical copper electrodes with diameters of 200 mm were used as the high-voltage electrode and grounding electrode, with silicone oil as the medium.…”

Section: Voltage Breakdown Testingmentioning

confidence: 99%

Investigation of the Space Charge and DC Breakdown Behavior of XLPE/α-Al2O3 Nanocomposites

Guo

Xing²,

Zhao

et al. 2020

Materials

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This paper describes the effects of α-Al2O3 nanosheets on the direct current voltage breakdown strength and space charge accumulation in crosslinked polyethylene/α-Al2O3 nanocomposites. The α-Al2O3 nanosheets with a uniform size and high aspect ratio were synthesized, surface-modified, and characterized. The α-Al2O3 nanosheets were uniformly distributed into a crosslinked polyethylene matrix by mechanical blending and hot-press crosslinking. Direct current breakdown testing, electrical conductivity tests, and measurements of space charge indicated that the addition of α-Al2O3 nanosheets introduced a large number of deep traps, blocked the charge injection, and decreased the charge carrier mobility, thereby significantly reducing the conductivity (from 3.25 × 10−13 S/m to 1.04 × 10−13 S/m), improving the direct current breakdown strength (from 220 to 320 kV/mm) and suppressing the space charge accumulation in the crosslinked polyethylene matrix. Besides, the results of direct current breakdown testing and electrical conductivity tests also showed that the surface modification of α-Al2O3 nanosheets effectively improved the direct current breakdown strength and reduced the conductivity of crosslinked polyethylene/α-Al2O3 nanocomposites.

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Section: Voltage Breakdown Testingmentioning

confidence: 99%

Investigation of the Space Charge and DC Breakdown Behavior of XLPE/α-Al2O3 Nanocomposites

Guo

Xing²,

Zhao

et al. 2020

Materials

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“…However, most of the voltage stabilizers are small molecular compounds, which can only be blended with XLPE and are easily migrated, and their long‐term effect is difficult to be guaranteed. Dong et al 30 found that grafting voltage stabilizer onto polymer molecular chains can effectively inhibit its migration and improve the thermal stability of composites. Li et al 31 proposed grafting benzophenone voltage stabilizer 4‐allyloxy‐2‐hydroxybenzophenone (AHOBP) onto XLPE molecular chains.…”

Section: Introductionmentioning

confidence: 99%

Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Ren

Deng

et al. 2022

J of Applied Polymer Sci

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With the popular application of alternating current/direct current (AC/DC) hybrid power grid, ultra-high-voltage (UHV) AC/DC cables of long-distance and largecapacity transmission systems have been strongly demanded. Voltage stabilizers are widely used to resist AC electrical tree of cross-linked polyethylene (XLPE) insulation materials, but poor compatibility with polymer matrix limited improvement of DC insulation performance. In this research, the maleic anhydride-modified 2,4-dihydroxybenzophenone as a novel voltage stabilizer 4-(4-benzoyl-3-hydroxyphenoxy)-4-oxobut-2-enoic acid (MDVS) was synthesized to improve the electrical properties of XLPE. The XLPE-g-MDVS with different contents of MDVS was prepared, and both AC electrical properties and DC electrical properties were tested.The results indicate that the modified XLPE retain the characteristic of voltage stabilizer to resist AC electrical tree and improve breakdown strength, and to exhibit excellent DC insulation performance in a wide temperature range. In the comparison with the pristine XLPE, the graft of MDVS can significantly suppress space charge accumulation and decrease DC conductivity. At 70 C, the maximum amount of space charge density of XLPE-g-1.2wt%MDVS is 56.2% lower than that of XLPE, and the DC conductivity decreases by nearly two orders of magnitude. Furthermore, the DC breakdown strength of XLPE-g-1.2wt%MDVS materials exhibit higher than that of the pristine XLPE. In addition to the self-excited energy dissipation of the voltage stabilizer, quantum chemical calculations demonstrated that the improvement of DC performance attributed to the deep traps introduced by MDVS.

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“…Zhang et al [25,26] found through theoretical calculations that acetophenone and its derivatives can undergo a keto-enol exchange isomerization reaction after absorbing energy, and acetophenone grafting to polyethylene chains can also improve the electrical strength of polyethylene. Dong et al [27] synthesized a grafted voltage stabilizer that can be grafted onto XLPE molecule chains during the crosslinking process. It can improve the breakdown strength and suppress the migration of voltage stabilizers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Acetylated SEBS/PP for Potential HVDC Cable Insulation

Zhang

Wang

et al. 2021

Materials

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Blending thermoplastic elastomers into polypropylene (PP) can make it have great potential for high-voltage direct current (HVDC) cable insulation by improving its toughness. However, when a large amount of thermoplastic elastomer is blended, the electrical strength of PP will be decreased consequently, which cannot meet the electrical requirements of HVDC cables. To solve this problem, in this paper, the inherent structure of thermoplastic elastomer SEBS was used to construct acetophenone structural units on its benzene ring through Friedel–Crafts acylation, making it a voltage stabilizer that can enhance the electrical strength of the polymer. The DC electrical insulation properties and mechanical properties of acetylated SEBS (Ac-SEBS)/PP were investigated in this paper. The results showed that by doping 30% Ac-SEBS into PP, the acetophenone structural unit on Ac-SEBS remarkably increased the DC breakdown field strength of SEBS/PP by absorbing high-energy electrons. When the degree of acetylation reached 4.6%, the DC breakdown field strength of Ac-SEBS/ PP increased by 22.4% and was a little higher than that of PP. Ac-SEBS, with high electron affinity, is also able to reduce carrier mobility through electron capture, resulting in lower conductivity currents in SEBS/PP and suppressing space charge accumulation to a certain extent, which enhances the insulation properties. Besides, the highly flexible Ac-SEBS can maintain the toughening effect of SEBS, resulting in a remarkable increase in the tensile strength and elongation at the break of PP. Therefore, Ac-SEBS/PP blends possess excellent insulation properties and mechanical properties simultaneously, which are promising as insulation materials for HVDC cables.

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Use of Grafted Voltage Stabilizer to Enhance Dielectric Strength of Cross-Linked Polyethylene

Cited by 21 publications

References 31 publications

Investigation of the Space Charge and DC Breakdown Behavior of XLPE/α-Al2O3 Nanocomposites

Investigation of the Space Charge and DC Breakdown Behavior of XLPE/α-Al2O3 Nanocomposites

Graftable voltage stabilizer for enhancing insulation performance of crosslinked polyethylene

Effect of Acetylated SEBS/PP for Potential HVDC Cable Insulation

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