Degradation distribution in insulation materials of cables by accelerated thermal and radiation ageing

Shimada, Akihiko; Sugimoto, Masaki; Kudoh, Hisaaki; Tamura, Kiyotoshi; Seguchi, Tadao

doi:10.1109/tdei.2013.6678859

Cited by 59 publications

(52 citation statements)

References 8 publications

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“…In our previous studies, the mechanical properties and chemical reactions were investigated for EPR and XLPE by the accelerated ageing using various experimental techniques [10][11][12][13][14]. The same technique was applied to SiR insulation material and the degradation mechanism was elucidated.…”

Section: Introductionmentioning

confidence: 99%

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

Shimada

Sugimoto

Kudoh

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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The degradation behavior of SiR for the cable insulation by accelerated thermal and radiation ageing was studied and the degradation mechanism was proposed. The degradation was observed by the change of tensile properties, the distribution of crosslinking, and the change of weight. The chemical reaction under the both ageing in oxidation conditions was crosslinking and the oxidation mechanism was found to be the same between thermal and radiation ageing. The yield of crosslinking was proportional to the ageing time and also the dose. The effect of irradiation temperature on oxidation was accelerated with an increase of temperature above around 120 0 C, which might be due to the specific radiation chemical reactions. Therefore, the degradation by simultaneous ageing at higher temperatures above 155 0 C was much higher than that for sequential ageing, such as irradiation followed by thermal ageing or thermal ageing followed irradiation. At a high temperature, the degradation by thermal ageing under vacuum (without oxidation) was more progressed than that for the ageing in air (with oxidation). The reason was assumed to be the thermal decomposition of crosslinks between SiR molecules formed by the chemical crosslinking agent. The hardness (Shore hardness) reflected well the degradation of the SiR material for any ageing conditions.

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Section: Introductionmentioning

confidence: 99%

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

Shimada

Sugimoto

Kudoh

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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“…The peaks at 1194 and 920 cm -1 indicated the formation of PPy in its doped state [9,10]. The characteristic bands of LDPE at 2942-2844, 1467, 1373, 724 cm -1 assigned to -CH 2 -vibration peaks were observed [11]. The typical characteristic peaks of PPy and LDPE appeared in FTIR spectra of LDPE/PPy nanocomposites, although some peaks for PPy were not distinguished due to the low doping amount.…”

Section: Resultsmentioning

confidence: 98%

Preparation of polypyrrole nanobowls and their effect for improving direct current dielectric properties of polyethylene

Zhang

et al. 2016

Polymer Testing

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Polypyrrole (PPy) nanobowls were successfully prepared through a reactive self-degraded template polymerization and the morphology of PPy nanobowls was characterized by scanning electron microscopy (SEM). The nanobowls were uniform with diameters of about 100 nm. The low density polyethylene/polypyrrole (LDPE/PPy) nanocomposites were obtained by melt blending method. The structures of PPy nanobowls and the nanocomposites were studied by Fourier transform infrared spectrometer (FT-IR). Space charge distributions in LDPE/PPy nanocomposites with different PPy nanobowls contents were measured using the pulsed electroacoustic (PEA) method. The results indicated that PPy nanobowls doping with a small quantity exhibited excellent suppression performance of space charge accumulation in LDPE and the nanocomposites showed improved direct current (DC) electrical conductivity and breakdown characteristics.

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“…7, which was measured in the as-received sample. As listed in Table I, the two absorption peaks at 2917 and 2848 cm −1 are, respectively, attributable to the asymmetric and symmetric stretch of CH 2 , while a characteristic peak of carbonyl groups appears at 1711 cm −1 [11].…”

Section: Ft-mir Spectroscopy Multiple Peaks Arementioning

confidence: 99%

Aging behavior of flame‐retardant cross‐linked polyethylene in nuclear power plant environments

Yang

Kaneko

Hirai

et al. 2019

IEEJ Transactions Elec Engng

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Sheets of flame‐retardant cross‐linked polyethylene (FR‐XLPE) were aged thermally at 80, 100, 135, and 155 °C for various periods from 100 to 800 h. They were also aged concurrently by heat and gamma rays at the same temperatures for the same periods at a dose rate of 100 Gy/h. For these sheets, we measured indenter modulus, elongation at break, complex permittivity, and absorption spectra at midinfrared and THz frequencies. As a result, it has become clear that the aging at 135 °C makes FR‐XLPE hard regardless of the presence of concurrent irradiation of gamma rays. This makes the transport of charge carriers difficult. Therefore, both the real and the imaginary parts of complex permittivity decrease, which is significant if the measurement frequency is low. However, this tendency becomes opposite as the samples were aged at 155 °C by heat or concurrently by heat and radiation. Using indenter modulus as an indicator, it has become clear that the aging progress is composed of two different stages, which could be a good clue to the explanation of these opposite changes in complex permittivity. On the other hand, the samples aged at 155 °C concurrently by heat and radiation show larger values in the indenter modulus and in two parts of complex permittivity than the samples aged at the same temperature only by heat. This is probably due to the oxidative degradation induced by the cooperative reaction of heat and radiation. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Degradation distribution in insulation materials of cables by accelerated thermal and radiation ageing

Cited by 59 publications

References 8 publications

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

Degradation mechanisms of silicone rubber (SiR) by accelerated ageing for cables of nuclear power plant

Preparation of polypyrrole nanobowls and their effect for improving direct current dielectric properties of polyethylene

Aging behavior of flame‐retardant cross‐linked polyethylene in nuclear power plant environments

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