Chemical Structure and Breakdown Behaviors of a New AC 500kV XLPE Submarine Cable Insulation with Different Thermal Aging Conditions

Wang, Xiaojian; Gao, Z.; Liu, Zhiqian; Zhu, Zhigang; Li, Shiqiang; Hao, Jian; Ma, Zhipeng

doi:10.1109/ceidp.2018.8544797

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…High-voltage alternating-current (HVAC) submarine cables play a vital role in the cross-sea interconnection project, which transmits the power between the mainland, islands and offshore platforms [1][2][3][4]. The repair joint is a crucial component of the cable and has a significant effect on the rapid maintenance and emergency repair, ensuring the reliability of the operation, especially for submarine cables [5].…”

Section: Introductionmentioning

confidence: 99%

Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations

Zhang¹,

Wang

et al. 2020

High Voltage

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The repair joints of high‐voltage cables play a significant role in the urgent cable maintenance, by recovering cable conductor, insulation, shielding layer and waterproof layer especially for submarine cables. However, the molecule diffusion and permeation processes from waterproof sealant into the cable joint insulation occur, leading to the insulation ageing and deterioration. In this article, the molecule diffusion behaviours of six typical molecules from the asphalt‐based and polyurethane‐based waterproof sealants into silicone rubber insulation are investigated. The results show that the order of diffusion coefficients is as follows, phenanthrene > fluoranthene > pyrene > benzo [k] fluoranthene > indeno [1,2,3‐cd] pyrene > polyurethane (PU). The relative molecular mass and binding energy are pivotal factors affecting the diffusion behaviour, while there is a linear relationship between the logarithm of the diffusion coefficient and the ratio of binding energy to relative molecular mass. Besides, the rising ambient temperature increases the fraction of free volume of silicone rubber and decreases the binding energy, thus resulting in a higher diffusion coefficient and an enhanced permeation process of the asphalt‐based sealant. In summary, the PU‐based waterproof sealant, with a much lower permeability than the asphalt‐based material, has a potential application in the waterproof layer for high‐voltage submarine cable repair joints.

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Section: Introductionmentioning

confidence: 99%

Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations

Zhang¹,

Wang

et al. 2020

High Voltage

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“…Cross-linked polyethylene (XLPE) has outstanding physical and chemical properties [1]. The AC 500 kV power interconnection project in Zhoushan, Zhejiang province of China is…”

Section: Introductionmentioning

confidence: 99%

“…In terms of thermal performance analysis, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) X-ray diffractometry (XRD) and fourier-transform infra-red (FTIR) spectroscopy has been used [6], [7]. It was found that the crystallinity of the XLPE material decreases significantly and a large amount of carbonyl groups (-C = O-) were produced [1], [8]- [10]. The breakdown strength and endurance life under multi-stress also showed a downward trend with the development of thermal aging [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

Morphological, Structural, and Dielectric Properties of Thermally Aged AC 500 kV XLPE Submarine Cable Insulation Material and Its Deterioration Condition Assessment

et al. 2019

Self Cite

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Cross-linked polyethylene (XLPE) has been widely used as insulation material for cables. In 2019, the highest voltage level AC 500 kV XLPE submarine cable has been operated in Zhoushan, China. The irreversible degradation poses a safety hazard to the operation of submarine cable. Therefore, it is necessary to investigate the physical, chemical and electrical properties of XLPE submarine cable insulation under aging condition and explore the method for its deterioration degree assessment. In this paper, the AC 500 kV XLPE submarine cable insulation material was thermally aged at 130 • C. The deterioration characteristics of materials were analyzed based on morphology, chemical structure, mechanical property, thermal property and dielectric properties. Multiple characteristic parameters were extracted and new deterioration condition assessment model was established. Results show that the physicochemical characteristic parameters including retention rate of elongation at break, carbonyl index (CI) based on FTIR, full-width at half-maximum (FWHM) of the diffraction peak based on XRD, melting enthalpy based on DSC analysis, and the dielectric characteristic parameters including modified Cole-Cole model parameter χ sα and AC breakdown strength are sensitive to deterioration condition of XLPE material. According to the change of elongation retention at break, the deterioration condition of XLPE sample was divided into enhanced stage, wear-out stage and disposal stage. The new multi-factor deterioration condition assessment model including six characteristic parameters (retention rate of elongation at break, CI, FWHM, melting enthalpy, modified Cole-Cole model parameter χ sα , AC breakdown strength) was successfully established by grey correlation analysis. The new model can reflect the property of mechanical, chemical, thermal and dielectric property and has prominent effect in differentiating deterioration degree of the AC 500 kV XLPE submarine cable insulation material. INDEX TERMS Cross-linked polyethylene (XLPE), thermal aging, physicochemical properties, dielectric properties, condition assessment.

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Aging Mechanism and Characterization of EPR Cable under Nonlinear Torsion Effect

et al. 2023

2023 IEEE 4th International Conference on Electrical Materials and Power Equipment (ICEMPE)

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Chemical Structure and Breakdown Behaviors of a New AC 500kV XLPE Submarine Cable Insulation with Different Thermal Aging Conditions

Cited by 3 publications

References 5 publications

Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations

Molecule diffusion behaviours of waterproof sealants into silicone rubber insulation for submarine cable joint based on molecular dynamics simulations

Morphological, Structural, and Dielectric Properties of Thermally Aged AC 500 kV XLPE Submarine Cable Insulation Material and Its Deterioration Condition Assessment

Aging Mechanism and Characterization of EPR Cable under Nonlinear Torsion Effect

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