Characteristics of electrical tree defect during the growth period in high‐voltage DC cable under stepped DC voltage

Zhu, Xi; Wu, Jiandong; Wang, Yalin; Yin, Yi

doi:10.1049/iet-gtd.2019.0078

Cited by 15 publications

(11 citation statements)

References 22 publications

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“…The growth of the trees becomes slow, and a stable situation is maintained. The trees develop continuously by the increase of space charge in the local high field area [59].…”

Section: Failure Analysis and Discussionmentioning

confidence: 99%

“…Due to the trapping and detrapping processes of the charge transport model, the energy release would break the molecular chains, resulting in the low‐density region. The trees can develop more quickly in the low‐density region forming a rapidly increasing stage of treeing [59]. In the case of long tree growth, the trapped charges around the tree tip are small restricting the growth of the trees by the weak discharges.…”

Section: Failure Analysis and Discussionmentioning

confidence: 99%

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Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

Wang

Yan

et al. 2021

IET Generation Trans & Dist

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This study reviews the failure of high-voltage submarine cables used in offshore power transmission and provides highlights of their failure characteristic, mechanisms, key issues and prospects. High-voltage submarine cables are designed and applied according to the high-voltage alternating current and high-voltage direct current requirements. Inevitably, the fault occurs in HV submarine cables that is different from that of an underground cable. External aggression remains the primary cause of faults, such as fishing and anchors. Most faults continue to occur at a shallow depth (300 m). The optical fiber inside the submarine cables plays a substantial role in the temperature and stress-strain monitoring and diagnosis. However, it is regarded as a weak point for electrical fault. Insulation breakdown is the leading reason for the short fault. The failure mechanism is complicated when associated with marine conditions. Some defects of insulation and extensive voids, water treeing, mechanical stress, partial discharges, overheating, and electrochemical erosion contribute to the insulation breakdown. Several key issues, including anchoring damage, treeing, defects, and thermal-electric ageing, are proposed. Prospects and new methods related to the cable failure, especially for insulation ageing by treeing and electrothermal effects, are also discussed. INTRODUCTIONSubmarine cables are widely used for new energy power systems in marine environments, such as offshore wind, wave, and solar power transmission applications, and as a power supply to remote areas [1-2]. High-voltage alternating current (HVAC) and high-voltage direct current (HVDC) are the main types of power transmissions by submarine cables [1,3]. Currently, submarine cables with long distances and high voltage carry high electric power between countries and offshore installations, such as oil/gas platforms and offshore wind farms [4][5][6]. Three-core submarine cable or three single submarine cables are employed for HVAC transmission. HVAC technology is simple and has high availability, but it lacks power control and requires reactive compensation [3,7]. Besides, it has a limited distance for high power transmission with high effi-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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“…The growth of the trees becomes slow, and a stable situation is maintained. The trees develop continuously by the increase of space charge in the local high field area [59].…”

Section: Failure Analysis and Discussionmentioning

confidence: 99%

Section: Failure Analysis and Discussionmentioning

confidence: 99%

Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

Wang

Yan

et al. 2021

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…However, studies have found that electrical trees are easily caused inside the insulation material [6][7]. Electrical treeing is a kind of pre-breakdown phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage

Wang

Huang

Zhang

et al. 2022

IET Science Measure & Tech

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To study the influence of the arrangement of glass fibres on the growth morphology of electric dendrites, this paper conducted experiments on the initiation and cultivation of electric dendrites on insulation specimens with different glass fibre arrangements. The experimental results show that when the electric field is parallel to the glass fibres, the electric dendrites show linear growth with multiple branches; when the electric field is perpendicular to the glass fibres, the electric dendrites show aggregated growth. The analysis suggests that when the applied electric field is parallel to the glass fibre, to release the discharge energy in the main channel of the dendrite, the discharge in the track of the electric dendrite will drive the electric dendrite to grow along the interface area between the glass fibre and the epoxy resin. When the externally applied electric field is perpendicular to the glass fibre, the discharge within the electric dendrite discharge channel is high. To release the energy in the electrical tree channel, the blast in the electrical tree track induces the electrical tree branch to grow along the interface area and forward.

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“…Recent research works indicated that PD characteristics are related to the charge transportation and the trap distribution of oil paper insulation [11]. Muhammad et al [12,13] reported that the shallow traps produced by the aluminum oxide (Al 2 O 3 ) nanoparticles in oil paper insulation contribute to the enhancement of creeping flashover voltage.…”

Section: Introductionmentioning

confidence: 99%

Charge migration of multilayer oil paper on the process of partial discharge under AC voltage

Gao

Liu

et al. 2021

IET Generation Trans & Dist

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As one of the main reasons for the deterioration of Nomex paper and charge migration, partial discharge (PD) plays a critical role during PD degradation. In this study, the PD characteristics of multilayer oil paper are focused on. In order to explore the characteristics of charge migration, the experiments of the relative permittivity, conductivity, isothermal surface potential decay, scanning electron microscopy and Fourier infrared spectroscopy have been carried out. The results show that the discharge branches of the second layer are two and three times longer than those in the first layer. In addition, the trap level of the first layer for PD degradation samples increases with the degree of PD degradation. The charges captured by deep traps provide seed charges for PD on the surface of the first layer. The charge transportation will accelerate the formation of shallow traps. The charge distribution and shallow traps contribute to the expansion of discharge branches. 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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Characteristics of electrical tree defect during the growth period in high‐voltage DC cable under stepped DC voltage

Cited by 15 publications

References 22 publications

Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

Failure of submarine cables used in high‐voltage power transmission: Characteristics, mechanisms, key issues and prospects

Characteristics of electrical tree morphological in glass fibre reinforced epoxy resin under power frequency voltage

Charge migration of multilayer oil paper on the process of partial discharge under AC voltage

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