Effect of Thermal Aging on DC Conductivity of NANO-CB/XLPE Insulating Composites

Suo, Changyou; Qin, Yao; Li, Zhonghua

doi:10.1109/ichve.2018.8641859

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…With the extension of aging time, the crystallization is destroyed, the conductivity increases, and the electrical performance decreases obviously. 14 Fothergill and co-workers used dielectric spectroscopy to study the properties of XLPE insulating materials after 60 days of accelerated thermal aging at 135 C. The results show that thermal aging can improve the low frequency conductivity, dielectric constant, discharge current, and dielectric loss of XLPE insulating materials. 15 The research shows that the safety of high-voltage cable is not only related to the insulation layer, but also closely related to the inner semi-conductive shielding layer (referred to as: shielding layer).…”

Section: Introductionmentioning

confidence: 99%

“…The results show that the properties of insulating materials have little change in the early aging period. With the extension of aging time, the crystallization is destroyed, the conductivity increases, and the electrical performance decreases obviously 14 . Fothergill and co‐workers used dielectric spectroscopy to study the properties of XLPE insulating materials after 60 days of accelerated thermal aging at 135°C.…”

Section: Introductionmentioning

confidence: 99%

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Effect and mechanism analysis of matrix resin type on thermal aging characteristics of semi‐conductive shielding material for high voltage cable

Liu,

et al. 2024

J of Applied Polymer Sci

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The type of matrix resin of the semi‐conductive shielding layer directly affects the thermal aging characteristics of the semi‐conductive shielding layer and the high‐voltage cable. In this paper, ethylene vinyl acetate (EVA), ethylene ethyl acrylate (EEA), and ethylene butyl acrylate (EBA) resins were used as matrix to prepare carbon black (CB) + EVA, CB + EEA, and CB + EBA shielding materials. The law of physicochemical, electrical, and mechanical properties of different matrix resin shielding materials with aging time was studied, and the influence mechanism of matrix resin on the aging characteristics of shielding materials was analyzed. The results show: with the increase of aging time, the crystallization area and the number of functional groups of the three shielding materials decreased to varying degrees. The number of functional groups in CB + EBA shielding materials decreased evenly with aging time, but that of CB + EVA and CB + EEA shielding materials changed significantly after 7 days of aging. After 60 days of aging, the crystallization area of CB + EBA shielding material changed slightly, but that of CB + EVA and CB + EEA shielding material decrease significantly. The electrical properties of the three shielding materials showed different decreasing trend with aging time. When the aging time is 7 days, the positive temperature coefficient (PTC) effect of CB + EEA shielding material decreases obviously. When the aging time is 30 days, the resistivity of CB + EVA and CB + EEA shielding material increases slowly (9 Ω cm–12 Ω cm) with the increase of temperature. When the aging time is 60 days, the resistivity of CB + EBA shielding material decreases obviously, and the PTC effect weakens obviously. Taking the mechanical properties of the shielding material as reference, the rapid deterioration stage of the mechanical properties of the three shielding materials is different. The CB + EVA and CB + EEA shielding material rapid deterioration time is 0–7 days, and the tensile strength and elongation of the shielding material are greatly reduced. The rapid deterioration stage of CB + EBA shielding material is 7–30 days, and the tensile strength and elongation decrease from 24.38 MPa and 499.5% to 14 MPa and 155.7%, respectively. This work can provide data support for the selection of matrix resin of shielding material and the fault analysis of shielding layer of high voltage cable.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect and mechanism analysis of matrix resin type on thermal aging characteristics of semi‐conductive shielding material for high voltage cable

Liu,

et al. 2024

J of Applied Polymer Sci

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“…Under normal service conditions, the operating temperature of cable insulation is around 90 °C due to the large ampacity. Sometimes the maximum temperature caused by short circuit or overload can reach 150 °C in a short time [ 7 , 8 ]. Therefore, thermal degradation is still one of the most severe factors that causes cable failure during its service life [ 9 ].…”

Section: Introductionmentioning

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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“…In brief, the aging performance change in polymer-based insulation materials can be categorised into four main categories: physical, chemical, thermal, and electrical [ 7 , 8 , 20 , 22 , 23 , 24 ]. The physical performance includes deformation, fracture, roughness, colour, hydrophobicity, hardness, and tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Degradation and Lifetime Prediction of Epoxy Composite Insulation Materials under High Relative Humidity

Yang

Wang

et al. 2023

Polymers

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Insulation failure of composite epoxy insulation materials in distribution switchgear under the stress of heat and humidity is one of the leading causes of damage to switchgear components. This work prepared composite epoxy insulation materials by casting and curing a diglycidyl ether of bisphenol A (DGEBA)/anhydride/wollastonite composite system, and performed material accelerated aging experiments under three conditions: 75 °C and 95% relative humidity (RH), 85 °C and 95% RH, and 95 °C and 95% RH. Material, mechanical, thermal, chemical, and microstructural properties were investigated. Based on the IEC 60216-2 standard and our data, tensile strength and ester carbonyl bond (C=O) absorption in infrared spectra were chosen as failure criteria. At the failure points, the ester C=O absorption decreased to ~28% and the tensile strength decreased to 50%. Accordingly, a lifetime prediction model was established to estimate material lifetime at 25 °C and 95% RH to be 33.16 years. The material degradation mechanism was attributed to the hydrolysis of epoxy resin ester bonds into organic acids and alcohols under heat and humidity stresses. Organic acids reacted with calcium ions (Ca2+) of fillers to form carboxylate, which destroyed the resin-filler interface, resulting in a hydrophilic surface and a decrease in mechanical strength.

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Effect of Thermal Aging on DC Conductivity of NANO-CB/XLPE Insulating Composites

Cited by 7 publications

References 7 publications

Effect and mechanism analysis of matrix resin type on thermal aging characteristics of semi‐conductive shielding material for high voltage cable

Effect and mechanism analysis of matrix resin type on thermal aging characteristics of semi‐conductive shielding material for high voltage cable

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

Degradation and Lifetime Prediction of Epoxy Composite Insulation Materials under High Relative Humidity

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