High Temperature Insulation Materials for DC Cable Insulation — Part III: Degradation and Surface Breakdown

Li, Chuanyang; Shahsavarian, Tohid; Baferani, Mohamadreza Arab; Wang, Ningzhen; Ronzello, JoAnne; Cao, Yang

doi:10.1109/tdei.2020.009165

Cited by 17 publications

(7 citation statements)

References 21 publications

(22 reference statements)

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“…But such power resources involved long-distance power transmission cables [1][2][3]. These transmissions involve high voltages and can only be achieved through a reliable moisture-proof and anti-corrosion insulation system [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen evolution and electromigration in the corrosion of aluminium metal sheath inside high‐voltage cables

et al. 2021

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The urgent need for power transmission is the reason for leading research on the safer operation of high-voltage cables. These high-voltage cables are emerging as an efficient technology for underground power transmission. However, the electrochemical corrosion of aluminium (Al) metal sheaths in these cables is a common and challenging degradation process. Herein, the corrosion mechanisms and electrochemical analysis are investigated by using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS) and laboratory-designed electrochemical characterisation techniques. In the corrosion experiments, the authors evaluated the corrosion rate by measuring the release rate of hydrogen gas and explored the different roles of sodium polyacrylate (NaPA) during the corrosion process. It is found that the complexation reactions between NaPA and Al inhibited corrosion while increased the resistance of the buffer layer. The proposed mechanisms of corrosion in this study can improve the lifespan and sustainability of high-voltage power transmission.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

Hydrogen evolution and electromigration in the corrosion of aluminium metal sheath inside high‐voltage cables

et al. 2021

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“…The experimental samples are PEEK and XLPE square films with a thickness of 100 μm and a side length of 25 mm. The chemical composition, density, and the operating temperature of samples are shown in Table 1 [23]. Before surface fluorination, samples were treated by ultrasonic processing in absolute ethyl alcohol and distilled water for 60 min, and then dried in a vacuum oven for 30 min at 70 °C.…”

Section: Experimental Setup 21 Sample Preparationmentioning

confidence: 99%

Fluorinated PEEK and XLPE as Promising Insulation Candidates for the Propulsion System of All-electric Aircraft

Xing

Chen

Yang

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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This article investigates the surface electrical properties of PEEK and XLPE before and after the fluorination modification. The samples are tested for surface conductivity, surface morphology, and surface anti-aging characteristics. The samples are also tested for flashover voltage with ramping voltage under 100 kPa, 20 kPa and 10 kPa. The results showed that the surfaces of PEEK and XLPE become slightly smoother with the increase of fluorination time, and the conductivity increased with the increase of fluorination time. After fluorination, the surface of PEEK shows significant hydrophilicity, while the surface hydrophobicity of XLPE is slightly reduced after fluorination, and there is a trend of recovery with the extension of fluorination time. After fluorination, the surface anti-aging performance is significantly improved. Compared with the untreated samples, the fluorinated PEEK has a higher flashover voltage at 100 kPa, and the flashover voltage is slightly increased at 10 kPa and 20 kPa, while the flashover voltage of XLPE after fluorination shows a downward trend especially under low pressures. This study provides a reference for fluorinated polymers as promising candidates for the insulation systems for all-electric aircraft.

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“…Different electrical properties of high temperature insulation materials including conductivity, space charge characteristic, surface flashover, surface anti-erosion properties and partial discharge behaviour at pressure variation have been thoroughly investigated and explained in our previous research works [13][14][15]. As explained in Section 1, conductivity is one of the influencing factors which can determine PD behaviour at DC voltage.…”

Section: Conductivitymentioning

confidence: 99%

“…Authors have already studied the PD behaviour of fluoropolymer-based insulated wires under AC and DC voltage at ambient and low pressure [12]. In addition, comprehensive investigations of the electrical properties of high-temperature materials including PI, PTFE, PEEK, FEP and ETFE have been thoroughly conducted and presented [13][14][15]. The non-linear conductivity dependency of these materials discussed in our previous work [13], however, characteristic of PDs initiated on the insulation surface due to non-uniform electric field intensity, as well as the temperature effect on this phenomenon, remain to be investigated thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Temperature‐dependent partial discharge characteristics of high temperature materials at DC voltage for hybrid propulsion systems

Shahsavarian

Lents

et al. 2021

High Voltage

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The safe and reliable operation of insulation material used in key high voltage components under extreme environmental conditions represents the major concerns for manufacturers and operators of More Electric Aircrafts (MEA). Surface discharge occurring in high current carrying components in DC power system diminishes the insulation material's performance and life, especially at high-temperature conditions. Here, the surface discharge behaviour of two commonly used high-temperature insulation materials, ethylene-tetrafluoroethylene (ETFE) and polyetheretherketone (PEEK) is studied at different temperatures under ramp and DC voltages. Extracted partial discharge (PD) features are presented and the impact of voltage polarity on surface discharge propagation is discussed. Our studies reveal that, while both materials exhibit non-linear PD behaviour with respect to their electrical conductivity, ETFE generally shows PDs with higher intensity at high temperature above 100°C with a higher possibility of surface discharge due to its lower permittivity. Overall, the PD mechanism in high-temperature, DC voltage applications is explored, and a basis for the selection of high-temperature PD suppressing materials is developed.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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High Temperature Insulation Materials for DC Cable Insulation — Part III: Degradation and Surface Breakdown

Cited by 17 publications

References 21 publications

Hydrogen evolution and electromigration in the corrosion of aluminium metal sheath inside high‐voltage cables

Hydrogen evolution and electromigration in the corrosion of aluminium metal sheath inside high‐voltage cables

Fluorinated PEEK and XLPE as Promising Insulation Candidates for the Propulsion System of All-electric Aircraft

Temperature‐dependent partial discharge characteristics of high temperature materials at DC voltage for hybrid propulsion systems

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