Comparison of partial discharge resistance among several biodegradable polymers

Miyata, Kazuhiro; Fujita, Shinsaku; Ohki, Yoshimichi; Tanaka, Toshikatsu

doi:10.1109/tdei.2007.4401230

Cited by 18 publications

(7 citation statements)

References 2 publications

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“…We have carried out many researches on the PD resistance of several biodegradable polymers under a constant voltage application and under different voltages adjusted to induce similar amounts of PD charge to all samples, and have compared the results with the PD resistance of low density polyethylene. As a result, we have found that PLLA has a PD resistance similar to that of polyethylene [6,7]. In this study, the effects of temperature and crystallinity (χ c ) on the PD resistance of PLLA are reported.…”

Section: Introductionmentioning

confidence: 81%

Effects of Temperature and Crystallinity on Partial Discharge Resistance of Poly‐L‐lactic Acid

Ohki

Miyata

2010

IEEJ Transactions Elec Engng

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Partial discharge (PD) resistance of biodegradable poly-L-lactic acid (PLLA) was examined at temperatures between room temperature and 70 • C, namely at around the glass transition temperature of 57 • C. The PD activity becomes more pronounced at temperatures above 60 • C, reflecting that the permittivity increases in the rubber state. Furthermore, we have changed the crystallinity of PLLA by drawing or annealing thermally, and have examined its effect on the PD resistance. Although the depth eroded by a fixed period of PD degradation becomes shallower when the sample was crystallized by the drawing or the heat treatment, its reduction ratio is almost equal to the reduction ratio of PD activities due to the decrease in permittivity. Therefore, it is hard to assume that crystallization of PLLA improves its PD resistance to a unit amount of charge. 

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Section: Introductionmentioning

confidence: 81%

Effects of Temperature and Crystallinity on Partial Discharge Resistance of Poly‐L‐lactic Acid

Ohki

Miyata

2010

IEEJ Transactions Elec Engng

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“…Therefore, the PD resistance is an important factor in determining the lifetime of many pieces of electrical apparatus such as cables. We have carried out researches on the PD resistance of several biodegradable polymers in comparison to that of low density polyethylene under a constant voltage application and also on the PD resistance to a unit amount of charge, and have found that PLLA has a PD resistance similar to that of polyethylene [6,7]. In this paper, the effect of crystallinity ( c ) on the PD resistance of PLLA is reported.…”

Section: Introductionmentioning

confidence: 92%

Effect of crystallinity on the partial discharge resistance of poly-L-lactide

Ohki

Miyata

2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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We have changed the crystallinity of biodegradable poly-L-lactide (PLLA) by drawing or by annealing thermally, and have examined its effect on the partial discharge (PD) resistance. Although the depth eroded by a fixed period of PD degradation becomes shallower when the sample was crystallized by the drawing or by the heat treatment, its reduction ratio is almost equal to the reduction ratio of PD activities due to the decrease in permittivity. Therefore, it is hard to assume that crystallization of PLLA improves its PD resistance to a unit amount of charge.

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“…Space charge is comparatively easier to accumulate in PLA than low-density PE (LDPE), and the PLA is more susceptible to photodegradation by ultraviolet photons [14]. Ohki et al have conducted a series of investigation on the electrical properties of several biodegradable polymers such as poly-L-lactic acid, polycaprolactone butylene succinate, PE terephthalate succinate, and polybutylene succinate: (i) their degradation affected by the water temperature and ultraviolet photon irradiation [18,19]; (ii) the comparison of their dielectric properties by analyzing the relative permittivity, the dielectric loss factors, the conduction current, the breakdown strength, and the partial discharge resistance [20][21][22][23][24]; and (iii) the effects of material properties including endothermic reaction, blending, glass temperature, and crystallinity on the dielectric properties [25][26][27][28][29][30]. Ohki et al have conducted a series of investigation on the electrical properties of several biodegradable polymers such as poly-L-lactic acid, polycaprolactone butylene succinate, PE terephthalate succinate, and polybutylene succinate: (i) their degradation affected by the water temperature and ultraviolet photon irradiation [18,19]; (ii) the comparison of their dielectric properties by analyzing the relative permittivity, the dielectric loss factors, the conduction current, the breakdown strength, and the partial discharge resistance [20][21][22][23][24]; and (iii) the effects of material properties including endothermic reaction, blending, glass temperature, and crystallinity on the dielectric properties [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…Matsushita et al have pointed that several biodegradable polymers have relatively low conductivity at room temperature but show rapid increase in the conduction current around their glass transition temperatures [15][16][17]. Ohki et al have conducted a series of investigation on the electrical properties of several biodegradable polymers such as poly-L-lactic acid, polycaprolactone butylene succinate, PE terephthalate succinate, and polybutylene succinate: (i) their degradation affected by the water temperature and ultraviolet photon irradiation [18,19]; (ii) the comparison of their dielectric properties by analyzing the relative permittivity, the dielectric loss factors, the conduction current, the breakdown strength, and the partial discharge resistance [20][21][22][23][24]; and (iii) the effects of material properties including endothermic reaction, blending, glass temperature, and crystallinity on the dielectric properties [25][26][27][28][29][30]. Meanwhile, on the basis of the basic investigation on the insulating properties, a biodegradable polymer-insulated cable has been experimentally manufactured and measured to obtain good performance [31].…”

Section: Introductionmentioning

confidence: 99%

Pattern analysis on dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field

Liu

2011

Int. Trans. Electr. Energ. Syst.

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SUMMARY This article presents pattern analysis to identify the dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field affected by the contaminated conditions, with low‐density polyethylene (LDPE) film as the reference. When the specimens were immersed in the electrolyte for different periods, their degradation was observed and the breakdown experiments were carried out by the needle‐plane electrode pattern with the air gap of 10 mm. The breakdown voltage was measured to determine the discharge and breakdown mechanism in the air/film gap under the nonuniform electric field. Meanwhile, the breakdown phenomena were captured by a monocular‐video‐zoom microscope, and the related breakdown characteristics were quantitatively analyzed through the methods of image processing and fractal dimension to establish the relationship between the pattern characteristics of breakdown craters and the dielectric properties. It is found that the morphology of breakdown region and the distribution of discharge profile in relationship with the contaminated levels can provide an optical evaluation method for the insulating materials. Compared with LDPE, biodegradable polyethylene shows the better breakdown endurance. By increasing the electrolyte conductivity and the immersion time, the breakdown voltage, the breakdown area, and the box dimension of the breakdown crater decrease. The breakdown voltage is higher than that of LDPE, whereas the breakdown area and the box dimension are lower. The results obtained indicate that the image–pattern identification technique is fairly well to quantify the breakdown phenomena of polymer films. Both breakdown area and box dimension reasonably give a scale to identify the dielectric properties for further investigation on feasibility of using biodegradable polymers. Copyright © 2011 John Wiley & Sons, Ltd.

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Comparison of partial discharge resistance among several biodegradable polymers

Cited by 18 publications

References 2 publications

Effects of Temperature and Crystallinity on Partial Discharge Resistance of Poly‐L‐lactic Acid

Effects of Temperature and Crystallinity on Partial Discharge Resistance of Poly‐L‐lactic Acid

Effect of crystallinity on the partial discharge resistance of poly-L-lactide

Pattern analysis on dielectric breakdown characteristics of biodegradable polyethylene film under nonuniform electric field

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