Electric Field Distribution Considering the Byproducts Inhomogeneity of Crosslinking Insulation in HVDC Cable

Li, Fēi; Zhong, Lisheng; Li, Wenpeng; Tao, Hexiang; Yu, Qinxue; Feng, Chao; Qing-wu, LI

doi:10.1109/icpadm49635.2021.9493889

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…It is found that the content of by-products in XLPE insulation decrease after degassing, which reduces impurity defects and hetero-charge in XLPE and improves the DC breakdown strength of XLPE ( Liu et al, 2017 ; Tu et al, 2018 ; Su et al, 2020 ), whereas the distribution of residual byproducts is radially inhomogeneous after degassing, which means the non-uniform conductivity of the cable insulation ( Hjerrild et al, 2002 ; Vissouvanadin et al, 2011 ; Sonerud et al, 2014 ). The results of the electric field simulation indicate that the non-uniform conductivity enlarges the distortion of the electric field in cable insulation and conversely raises the risk of breakdown ( Ren et al, 2020 ; Li et al, 2021 ). However, these investigations are case studies based on specific cables and lack generality.…”

Section: Introductionmentioning

confidence: 99%

Phase Field Modeling on By-Product Migration in Crosslinking Polymers for HVDC Cable Insulation Applications

Jiang

et al. 2022

Front. Chem.

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Cross-linking by-products has been considered as one of the crucial factors for dielectric properties of cross-linked polyethylene, which plays an important role in the insulation performance of high voltage direct current (HVDC) cables. It migrates across cable insulation incorporating space charge effect, temperature variation of conductivity, etc., which makes it a long-standing puzzle of manipulating the electric field distribution for HVDC cable insulation, especially with the increasing voltage level. Nevertheless, there still lacks a theoretical model describing the migration of the by-products, especially for cable insulation with sizeable dimensions. In this article, a phase field model is established to simulate the migration of acetophenone (i.e., one of the by-products) through calculating the free energy landscape considering the competition between the diffusion driven by concentration gradient and the uphill diffusion caused by by-product aggregation. The results show that the time-dependence migration during degassing leads to an uneven distribution of acetophenone across the cable insulation, which is in good coincidence with the measured results for a full-size cable. Accordingly, the distortion of the electric field in HVDC cable insulation due to the radial distribution variation of acetophenone has been estimated regarding the relationship between by-product content and conductivity, and a method of manipulating the distribution of acetophenone is proposed to optimize the distribution of the electric field in cable insulation. Our work provides a numerical approach for the simulation of by-product migration in crosslinked polymers for insulation applications.

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Section: Introductionmentioning

confidence: 99%

Phase Field Modeling on By-Product Migration in Crosslinking Polymers for HVDC Cable Insulation Applications

Jiang

et al. 2022

Front. Chem.

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“…A variety kinds of additives such as metal chelates or phenolic compounds have been widely used as efficient flame retardants or UV stabilizer of the PP [33][34][35]. However, the presence of additives in polymers sometimes act as impurities and trigger the inhomogeneity in electrical field under HV, causing electrical breakdown as well as water and electrical trees, resulting in seriously decreasing the electrical durability [36,37].…”

Section: Introductionmentioning

confidence: 99%

Influence of phosphorus-based flame retardants on polypropylene insulation for high-voltage power cable applications

Kim¹,

Lee²,

Hong³

et al. 2022

Funct. Compos. Struct.

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For high voltage (HV) power cable applications, various studies have been performed to improve the mechanical and electrical properties of polypropylene (PP)-based insulation materials to replace crosslinked polyethylene (XLPE). However, studies on the effect of additives to yield additional PP properties are still lacking. Herein, we prepared PP blends by melt-mixing widely used commercial flame retardants for PP with isotactic PP (iPP) and investigated their electrical breakdown, flame retardancy behaviors, and UV stability. Among the five kinds of flame retardants employed, aluminum hypophosphite (AHP), aluminum diethyl phosphinate (ADP), melamine pyrophosphate (MP), ammonium polyphosphate (APP), and APP treated with silane (SAPP), AHP was very effective in minimizing the decrease of the direct current (DC) breakdown strength (BDS) of iPP at both 25 and 110 °C in the range of 5–20 phr. Particularly, only AHP afforded V-2 grade flame retardancy to iPP, and the flame retardancy was maintained even when the content was reduced to 3 phr. Furthermore, upon exposure to ultraviolet (UV) rays for 5 days, the tensile strength of pristine iPP decreased by approximately 44%, while that of a blend with 3 phr AHP decreased by only 10%. The study results will contribute to the optimization of power cable products through the use of appropriate flame retardants in the design of high-performance PP-based HV insulation materials.

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Study on the Influence of Crosslinking By-Products on XLPE Breakdown Performance in XLPE Cables Based on the First-Principles and Band Gap Theory

Zhao,

Liu,

You

et al. 2023

Lecture Notes in Electrical Engineering

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Electric Field Distribution Considering the Byproducts Inhomogeneity of Crosslinking Insulation in HVDC Cable

Cited by 6 publications

References 7 publications

Phase Field Modeling on By-Product Migration in Crosslinking Polymers for HVDC Cable Insulation Applications

Phase Field Modeling on By-Product Migration in Crosslinking Polymers for HVDC Cable Insulation Applications

Influence of phosphorus-based flame retardants on polypropylene insulation for high-voltage power cable applications

Study on the Influence of Crosslinking By-Products on XLPE Breakdown Performance in XLPE Cables Based on the First-Principles and Band Gap Theory

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