Influence of Water on the Electric Breakdown of Polyethylene Terephthalate Films

Miyairi, Keiichi

doi:10.1143/jjap.20.2325

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…These impurities are ionised, especially in wet conditions or at high temperatures, and contribute to the electrical conduction. Extremely low electric strength, which is attributed to the increase in conductivity due to moisture, has been observed in moistened PET films (Miyairi 1981). The variation of tan 6 with time is shown in figure 3.…”

Section: Variation Of Tan 6 With Temperaturementioning

confidence: 96%

“…Ions often enhance the electric field near the blocking electrode, leading to dielectric breakdown. Measurements of a thermally stimulated current (TSC), a transient current with polarity reversal of the applied voltage or a current decay with DC voltage, have been made in order to know the behaviour of ions in polyethylene terephthalate (PET) (Miyairi andIeda 1976, Kaneko andHino 1981). The same method as described above has been applied to Nylon, in the investigation of the behaviour of ions near electrodes (Nakamura et a1 1981).…”

Section: Introductionmentioning

confidence: 99%

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Low-frequency dielectric response of polyethylene terephthalate (PET) films

Miyairi

1986

J. Phys. D: Appl. Phys.

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The Garton effect has been observed in PET films in the low-frequency range from 0.0003 to 0.1 Hz. The current wave manifests a remarkable deformation which depends on the temperature, the applied voltage, the frequency and the sample thickness. Tan delta evaluated from the power loss decreases with the increase in applied voltage. A model based on the electrode polarisation has been proposed to explain the experimental results such as the deformation of the current wave and the magnitude of tan delta . The activation energy of the mobility of carriers has been evaluated to be approximately 1.5 eV.

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Section: Variation Of Tan 6 With Temperaturementioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Low-frequency dielectric response of polyethylene terephthalate (PET) films

Miyairi

1986

J. Phys. D: Appl. Phys.

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“…While temperature effects in PET films have been extensively studied by means of BDS [3][4][5]9,11,12], comparatively little is known about the humidity effects. Miyairi found a minimum DC electric withstand strength of wet PET films around 0 °C which was explained by a conductivity increase due to adsorbed and/or absorbed water [13]. Further studies in the high-frequency region (> 0.1 kHz) showed an increase of dielectric permittivity and loss factor for wet PET films [5,14].…”

Section: Introductionmentioning

confidence: 93%

Humidity and Temperature Effects on the Dielectric Properties of PET Film

Küchler

Färber

Franck

2020

2020 IEEE Electrical Insulation Conference (EIC)

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The aim of the present manuscript is to contribute to the understanding of material performance of machine insulation film at high temperatures and changing relative humidity (RH). This represents a common stress under normal operation and may lower the material insulation performance. PET film is used as the example material and the complex dielectric permittivity is used as a marker to investigate changes in the dielectric properties. Measurements are carried out with a high precision dielectric spectrometer in a range of 10 -2 ..10 5 Hz at different temperatures (10..125 °C) and RH levels (0..80 %). In addition, evaluation of absorbed water at different RH levels (0..80 %) is done gravimetrically and exhibits a diffusion character according to Fick's law. Moreover, the proportionality of maximum absorption and RH level becomes apparent. Variation of temperature shows altered α and β loss mechanisms as well as changed DC conductivity proportions. The continuous permittivity increase during water absorption indicates the higher (moisture-induced) polar content in the polymer. However, a small portion of water seems to be bound to terminal -OH groups of PET, thus leading to an altered β relaxation. The observed increase of DC conductivity, not only with higher temperature but also with higher water content, points out the humidity-driven charge transport through the dielectric. A further, frequencydependent loss mechanism is only visible above a certain RH level that indicates pure water formation within the polymer. This study shows that even though the level of absorbed water for PET is below 0.4 %, the dielectric spectra reveal significant changes.

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Effect of humidity on the breakdown strength and diffusion characteristics of polymer film

Hossain

1993

Bull. Mater. Sci.

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Dielectric breakdown strength and diffusion characteristics were measured for polyimide and polyimide fluorocarbon polymer film at different weathering conditions. The dielectric breakdown strength and the diffusion coefficient were found to decrease in humid conditions. Different diffusion characteristics as well as breakdown mechanisms were observed on both sides in the PMF-1 polymer film. The permeation coefficient and diffusion coefficient decrease, thereby increasing the breakdown strength in more humid conditions that may be due to the formation of double potential well in the polymer film.

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Influence of Water on the Electric Breakdown of Polyethylene Terephthalate Films

Cited by 6 publications

References 2 publications

Low-frequency dielectric response of polyethylene terephthalate (PET) films

Low-frequency dielectric response of polyethylene terephthalate (PET) films

Humidity and Temperature Effects on the Dielectric Properties of PET Film

Effect of humidity on the breakdown strength and diffusion characteristics of polymer film

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