Generation mechanism of bow‐tie trees and development of their suppression method

Kuma, Shoji; Soma, Ken-ichiro; Sakaguchi, Harunori

doi:10.1002/eej.4391030504

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…It proved impossible to correlate BTT generation and progress with changes of water content in the XLPE before and after the tests. 4. We may assume that BTT generation and progress requires that inorganic contaminants (cations) in XLPE move directionally, and such motion is supported by the environment.…”

Section: Discussionmentioning

confidence: 99%

“…As regards the mechanisms of BTT generation and progress, assuming that BTT increase sharply in number when the water content of cross-linked polyethylene (XLPE) reaches saturation, a model based on water condensation and liquefaction has been proposed [4]. This model, also called the jet theory, suggests that gaseous moisture existing in XLPE as saturated vapor condenses and liquifies on the periphery of contaminants where the electric field is concentrated, and produces a high-pressure jet that leads to molecular chain cleavage [4]. In addition, oxidation products such as carbonyl compounds were observed recently around water trees, indicating a chemical mechanism: namely, XLPE oxidizes due to the catalytic action of metal ions (contaminants), which results in molecular chain cleavage [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Influence of water and ion diffusion on generation and progress of bow‐tie tree

Kumazawa

Nakagawa²,

Tsurumaru³

2007

Electrical Engineering Japan

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SUMMARYBow-tie tree (BTT) generated from contaminant, such as metal, carbon, amber (overcured resin) or void is a deterioration factor of XLPE cable. In particular, BTT in contact with inner or outer semiconductive shield could significantly lower residual AC breakdown voltage of HV power cables. To evaluate the influence of water and ion diffusion on generation and progress of BTT, we investigated the relationship between water content of XLPE and the generation of BTT under various accelerated aging conditions. The number of BTT in XLPE samples with accelerated aging under the open condition, involving evaporation of water in which samples were immersed, was very large compared with the closed condition. Furthermore, when samples were intermittently immersed in water, the number of BTT in samples was large compared with samples immersed continuously. In these experiments the generation of BTT seemed to have nothing to do with changes in water content before and after accelerated aging. Therefore, it was suggested that diffusion of ions rather than water in XLPE played an important role in the generation of BTT.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of water and ion diffusion on generation and progress of bow‐tie tree

Kumazawa

Nakagawa²,

Tsurumaru³

2007

Electrical Engineering Japan

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“…A number of explanations on the mechanism of this water tree phenomenon have been proposed [ 71 . Anong those many hypotheses, the following are the outline of our considerations [8].…”

Section: Idea Of Water Thee Suppiessionmentioning

confidence: 99%

Development of New Water Tree Suppressive XLPE Cable

Watanabe

Yagyu

Sekii

et al. 1986

IEEE Trans. Power Delivery

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With a view to develop a new water tree suppressive XLPE cable, the authors have investigated the effect of introducing polar groups into crosslinked polyethylene (XLPE) dielectrics.An aliphatic carboxylic acid derivative was found to be the best additive as a water tree suppressor.New cables insulated with XLPE dielectrics containing this aliphatic carboxylic acid derivative were developed. It was confirmed that the cables, having the same physical and electrical properties as those of conventional XLPE cables, showed an excellent water tree suppressive effect and long term performance. INTRWDUCTIONOwing to their excellent electrical and thermal properties, easy handling and maintenance, XLPE cables have been widely used in transmission and distribution systems. The system voltage of these cables has been rapidly increased, and nowadays even 275kV XLPE cables are in service.

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Water-tree property of cross-linked polyethylene-insulated cable under γ-ray irradiation

Yasuda

Yamazaki

Idesaki³

et al. 2011

Proceedings of 2011 International Symposium on Electrical Insulating Materials

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Generation mechanism of bow‐tie trees and development of their suppression method

Cited by 7 publications

References 3 publications

Influence of water and ion diffusion on generation and progress of bow‐tie tree

Influence of water and ion diffusion on generation and progress of bow‐tie tree

Development of New Water Tree Suppressive XLPE Cable

Water-tree property of cross-linked polyethylene-insulated cable under γ-ray irradiation

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Generation mechanism of bow‐tie trees and development of their suppression method

Cited by 7 publications

References 3 publications

Influence of water and ion diffusion on generation and progress of bow‐tie tree

Influence of water and ion diffusion on generation and progress of bow‐tie tree

Development of New Water Tree Suppressive XLPE Cable

Water-tree property of cross-linked polyethylene-insulated cable under &#x03B3;-ray irradiation

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Product

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Water-tree property of cross-linked polyethylene-insulated cable under γ-ray irradiation