Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique

Huang, Biao; Wang, Weiwang; Li, Shengtao; Li, Xinyuan; Nie, Yongjie; Deng, Yunkun; Jiang, Qihang

doi:10.1109/icempe51623.2021.9509116

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The samples were suspended vertically in the hot air-circulating ovens (TG220B, Chongqing Wuhuan Machine Co., Ltd., Chongqing, China) at the aging temperatures of 90 °C, 120 °C and 150 °C, respectively. Generally, 90 °C is the maximum working temperature of a power cable under normal working conditions, while 120 °C is the temperature allowed to operate for a period of time in the case of thermal overload, and 150 °C is the temperature at which XLPE can be allowed to work for periods under the condition of short circuit or overload [ 20 , 21 ]. As reported by Li, K. and Afia, R.S.A.…”

Section: Samples and Experimentsmentioning

confidence: 99%

Structural Changes and Very-Low-Frequency Nonlinear Dielectric Response of XLPE Cable Insulation under Thermal Aging

et al. 2023

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The structural changes and very-low-frequency (VLF) nonlinear dielectric responses are measured to evaluate the aging state of cross-linked polyethylene (XLPE) in power cables under various thermal aging conditions. For this purpose, the accelerated thermal aging experiments were performed on XLPE insulation materials at 90 °C, 120 °C and 150 °C with different durations of 240 h, 480 h and 720 h, respectively. The Fourier transform infrared spectrum (FTIR) characterization and differential scanning calorimeter (DSC) were tested to analyze the influence of different aging on physicochemical properties of XLPE insulation. Besides, the VLF dielectric spectra show that the permittivity and dielectric loss change significantly in the VLF range from 1 mHz to 0.2 Hz. A voltage–current (U–I) hysteresis curve referring to a standard sinusoidal voltage and the response current were introduced to characterize the nonlinear dielectric properties of XLPE insulation caused by thermal aging.

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Section: Samples and Experimentsmentioning

confidence: 99%

Structural Changes and Very-Low-Frequency Nonlinear Dielectric Response of XLPE Cable Insulation under Thermal Aging

et al. 2023

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“…Secondly, exploring the space charge characteristics of XLPE. Huang et al observed a gradual increase in dynamic charge ratio, dielectric constant, and conductivity of XLPE insulation with extended thermal aging time [ 18 ]. L. A. Disado et al conducted multiple stress life tests on flat specimens of polyethylene terephthalate (PET) at various temperatures and electrical stress levels.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

Yang,

Li,

et al. 2024

Polymers

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The aging of cable insulation presents a significant threat to the safe operation of cables, with space charge serving as a crucial factor influencing cable insulation degradation. However, the characteristics related to space charge and conduction current behavior during thermal aging remain unclear. This study focused on the thermal aging of cross-linked polyethylene (XLPE) material and utilizes a combined pulse electro-acoustic (PEA) and conduction current testing system to analyze the space charge and conduction current characteristics in the sample under varying electric fields and temperatures. The average charge density, short-circuit residual electric field, electric field distortion rate, and conduction current were studied. The findings indicate that the space charge in the samples following thermal aging is predominantly governed by the injected charge. The amorphous region of XLPE decreases, while the cross-linking degree increases after aging, thereby facilitating charge carrier migration within the sample and reducing the generation of charge carriers through thermal pyrolysis. The minimum temperature required for charge injection is reduced by thermal aging. Furthermore, modifications in conduction current, residual electric field, and average charge density indicate that thermal aging has the potential to alter the microstructure and trap characteristics of XLPE. This study provides empirical evidence to elucidate the underlying mechanism of cable insulation aging.

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Study on Insulation Performance of Thermal Aging XLPE Cables by Direct Current Integrated Charge Technique

Cited by 2 publications

References 6 publications

Structural Changes and Very-Low-Frequency Nonlinear Dielectric Response of XLPE Cable Insulation under Thermal Aging

Structural Changes and Very-Low-Frequency Nonlinear Dielectric Response of XLPE Cable Insulation under Thermal Aging

Influence of Thermal Aging on Space Charge Characteristics and Electrical Conduction Behavior of Cross-Linked Polyethylene Cable Insulation

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