Effects of magnetic field on cable sheath corrosion

Korzhov, A. V.

doi:10.1016/j.engfailanal.2020.104749

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…The obtained curve is more illustrative of the distribution of the magnetic induction intensity inside the cable, as shown in Figure 3. Research on the simulation and analysis of the magnetic field of cables already exists, and simulation result patterns are consistent with this paper, which qualitatively verifies the accuracy of the simulation in this paper [20][21][22].…”

Section: The Magnetic Field Of Cable Accessories In Good Conditionsupporting

confidence: 87%

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Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Sun

et al. 2023

Coatings

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Dampness is one of the most important factors leading to the degradation of the insulation performance of cable accessories; it may easily lead to interface defects of composite insulation. In this paper, an electromagnetic field defect model of the cable composite insulation interface is established, and the effects of the defect degree and the defect type on the magnetic flux and the harmonic current are studied. The results show that the magnetic field is uniformly distributed with a decreasing trend when the cable is in good condition, and the grounding current has no obvious harmonic component. For different defects, the magnetic field changes at the defect location are notably different; for water droplets and the water film, the magnetic field distortion is obvious at the location of the defect and sheath, and for water tree defects, the distortion of the magnetic field is significant. In addition, the degree of distortion caused by the same defect at different positions is also different, and the magnetic field contrast is not obvious at different degrees of moisture exposure. The distortion of the grounding current caused by the water tree is higher than that of the water droplet and the water film, and the characteristics of the harmonic components of the grounding current caused by different defects have obvious distinctions. The type of cable defect can be judged by the proportion of harmonic components. This work can be used as a reference for the assessment of the cable insulation defect status.

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Section: The Magnetic Field Of Cable Accessories In Good Conditionsupporting

confidence: 87%

“…The simulation of the magnetic field of the cable in the presence of water droplets and the magnetic field distribution at t = 15 ms for different defect degrees are shown in Figures 4 and 5. this paper, which qualitatively verifies the accuracy of the simulation in this paper [20][21][22].…”

Section: Effect Of Water Droplet Defects On the Magnetic Fluxsupporting

confidence: 81%

Effect of Interface Defects on the Harmonic Currents in Distribution Cable Accessories under Damp Conditions

Sun

et al. 2023

Coatings

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“…The corrosion of aluminium sheath severely affects the lifespan and sustainability of the high‐voltage cable [22]. Therefore, there exist an urgent need to fully investigate the corrosion rate of aluminium sheath in various corrosive environment.…”

Section: Introductionmentioning

confidence: 99%

Analysis for metal sheath corrosion rate in AC high voltage power cable

Lai

Liu³

et al. 2022

IET Generation Trans & Dist

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Reliable power transmission requires the safe operation of high-voltage cable. A number of high-voltage cable failures caused by aluminium sheath corrosion has been reported these years. However, neither discussion on factors influencing corrosion rate nor specification describing corrosion inhibiting method has been presented. Thus, it is crucial to address the research gap in evaluating corrosion rate of aluminium sheath in various corrosive environments. Here, the effect of chlorides on aluminium sheath corrosion is analyzed. Using scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), the corroded surface is investigated. Titration experiment is performed to quantify the chlorides content in buffer layer of cable. Polarization curves are employed to analyze the corrosion rate of aluminium sheath in different chlorides content environment. Surface analysis result shows that chlorine-rich phase can be observed on the corroded surface. Titration experiment result reveals that buffer layer used in high voltage cable is one of the sources of chlorides content which varies from 0.7 to 4.2 wt%. Finally, polarization curve shows that when chloride content increases from 0.6 to 1.8 wt%, the pitting potential left shifts from −0.689 to −0.742 V. The corrosion resistance of aluminium sheath deteriorates significantly with the increase of chlorides content.

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