Study on the electric-field characteristics of water tree region on the dry or wet condition in XLPE cables

Wei, Tao; Song, Shuyong; Zhang, Yue; Wu, Hao; Zhou, Kai; Li, Tianhua; Huang, Ming

doi:10.1109/ichve.2016.7800763

Cited by 13 publications

(2 citation statements)

References 8 publications

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“…Water trees are likely to grow in the cross-linked polyethylene (XLPE) insulation of medium voltage (MV) power cables installed in wet environment [1,2]. Water treeing can degrade the insulation, and under certain electrical stress cause electrical trees which can lead to the insulation breakdown [3,4].…”

Section: Introductionmentioning

confidence: 99%

Reflection characteristics of water treeing insulation in medium voltage cables

2023

Phys. Scr.

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This paper presents an analytical model based on wave reflection of dual interfaces for studying the reflection due to water treeing in the cross-linked polyethylene (XLPE) insulation of medium voltage cables. The model is expected to predict the reflection characteristics more accurately than that only considering reflection of a single interface. Experiments on a cable sample with mimic water trees are conducted to confirm the effectiveness of the presented model. The model can potentially be used to relate time-domain reflectometry (TDR) measurement results with characteristics of water treeing insulation in the cables.

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Section: Introductionmentioning

confidence: 99%

Reflection characteristics of water treeing insulation in medium voltage cables

2023

Phys. Scr.

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“…The treeing process caused by the air cavities in XLPE is given in [8], [9], while the treeing caused by water seepage that enters the XLPE material are given in [10], [11]. The breakdown of XLPE material due to impulse voltage is given in [12], [13]. In addition to these issues, at some locations in Indonesia, it was found that the protection relay did not detect the burn-down of AAAC-S.…”

Section: Introductionmentioning

confidence: 99%

Covered Conductor Burn-Down Phenomena in Indonesia without Protection Relay Operation

Pramana

Kusuma

Priambodo

et al. 2018

Int. J. Adv. Sci. Eng. Inf. Technol.

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All Aluminium Alloy Conductor-Shielded (AAAC-S) which is covered conductor is widely used as the temporary solution to mitigate the earth fault problem during application of bare conductor in Indonesia distribution system. However, the burn-down phenomenon of AAAC-S is often found in some cases, and the protection schemes that have been installed on the distribution line is unable to detect any fault during the phenomenon. Due to no tripping order from protection relay, this phenomenon will lead some part of the conductor to remain hanging in the air and still in energized condition. This condition may cause a potential hazard to the surrounding environment. Therefore, this study was performed to determine the cause of AAAC-S burn-down, and the reason of protective equipment cannot work properly. Field investigation, modeling and simulation, and laboratory testing have been performed in this study to represent the condition in the field. The results show that the burn-down phenomenon of AAAC-S occurred due to many sequences of events. It started with insulation material breakdown that creates pinhole; then during overvoltage phenomenon, there will be an earth fault condition through the pinhole. Finally, if the short circuit energy at a specific mechanical tensile exceeds the critical energy of AAAC-S, then the burn-down phenomenon occurred. In this condition, the protection relay is unable to detect the fault due to the working time of protection relay is greater than the critical burn-down time of AAAC-S, where it is being influenced by the location of an earth fault, the cross-sectional area of AAAC-S, and grounding resistance of the pole.

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