Superiority of dielectric properties of LDPE/MgO nanocomposites over microcomposites

Ishimoto, Kazuyuki; Kanegae, Etsu; Ohki, Yoshimichi; Tanaka, Toshikatsu; Sekiguchi, Y.; Murata, Y.; Reddy, C. C.

doi:10.1109/tdei.2009.5361597

Cited by 78 publications

(49 citation statements)

References 18 publications

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“…Figure 3 is the dielectric properties of neat LDPE and LDPE/MgO nanocomposites before and after stretching. It is obvious that the values of permittivity of nanocomposites increase with the increase of concentration of nanoparticles, which is the same as the research of Ishimoto et al [35]. Additionally, after stretching, the values of permittivity of all samples increase with different increasing amplitudes, in which neat LDPE has the smallest increasing amplitude but nanocomposite with concentration of 3 wt% has the largest.…”

Section: Space Charge Behaviorsupporting

confidence: 82%

“…On the other hand, the values of permittivity of nanocomposites may also increase after adding nanoparticles because of the large value of permittivity of MgO nanoparticles [35].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…It is noted that the carriers are probably to be captured by traps at the interface between polymer matrix and nanoparticles in LDPE/MgO nanocomposites, decreasing the carrier mobility [35]. According to Eq.…”

Section: Volume Resistivitymentioning

confidence: 99%

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Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

Wang¹,

Wang²

2017

Properties and Applications of Polymer Dielectrics

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Pulsed electroacoustic (PEA) method, dielectric analyzer, and high resistance meter were used to research the DC breakdown, space charge behavior, permittivity, loss tangent, and volume resistivity of neat low density polyethylene (LDPE) and LDPE/MgO nanocomposites with concentration of 1, 3, and 5 wt% with and without the elongation ratio of 1.1. Results indicate that the DC breakdown strengths of neat LDPE and nanocomposites decrease after stretching. The heterocharges near electrodes in neat LDPE change to homocharges after stretching and a large amount of positive and negative charges accumulated in samples with concentration of 3 and 5 wt%. Meanwhile, homocharges near cathode electrode in nanocomposite with concentration of 1 wt% decrease a little and a small amount of positive charges were observed in the samples after stretching. Furthermore, there are different increases in amplitudes of permittivity in all the samples after stretching, as well as the loss of tangents especially in the frequency domain from 10 −1 to 10 2 Hz. The results of volume resistivity show that comparing with the nanocomposite with the concentration of 1 wt% whose volume resistivity decrease after stretching, larger volume resistivity is observed in neat LDPE and nanocomposites with the concentration of 3 and 5 wt%.

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Section: Space Charge Behaviorsupporting

confidence: 82%

“…On the other hand, the values of permittivity of nanocomposites may also increase after adding nanoparticles because of the large value of permittivity of MgO nanoparticles [35].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

Wang¹,

Wang²

2017

Properties and Applications of Polymer Dielectrics

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“…Cross-linked polyethylene (XLPE) insulation with nano fillers is preferred for extra high voltage dc power cables, since it exhibited better dc dielectric performance than simple XLPE insulation [4]. In this regard, various dielectric properties of low density polyethylene (LDPE) with nano fillers such as MgO nano fillers have been intensively investigated as fundamental study [5] [6]. It is especially characteristic that LDPE/MgO nanocomposite exhibits much reduction in space charge formed inside insulation as compared to neat LDPE [7], resulting in avoiding dielectric failure due to the accumulation of space charge that usually appears in LDPE and XLPE insulation.…”

Section: Introductionmentioning

confidence: 99%

Tree initiation and growth in LDPE/MgO nanocomposites and roles of nano fillers

Tanaka

Iizuka

Sekiguchi

et al. 2009

2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena

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Processes of tree initiation and growth in LDPE/MgO nanocomposites were investigated by using optical and partial discharge (PD) detection methods. They can be divided into three stages depending on tree length. The first stage corresponds to the initial growth of about 10 m and might be subtly affected by the filler content up to 1 phr. This might be influenced by Coulombic field formed around nano fillers. The second stage is interpreted as tree growth around 100 m, and is suppressed by nano fillers up to 2 phr, where trees grow by colliding with nano fillers. The third stage leads to final breakdown at which tree lengths are of 1 mm order, and are retarded by nano fillers up to 10 phr, where PD erosion processes are involved.

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“…Despite its excellent properties it suffers from the problem of packet charge formation at higher fields [1][2][3][4][5][6][7]. Therefore understanding this complex phenomenon is very important in the design of cable insulation for higher fields.…”

Section: Introductionmentioning

confidence: 99%

Space charge dynamics in LDPE

Chahal

Reddy

2015

2015 International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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Now a days HVDC cables with polymeric insulation such as LDPE (Low Density Polyethylene), XLPE (Cross Linked Polyethylene) are widely used as compared to conventional oil impregnated HVDC cables. The polymeric insulation, despite its numerous advantages, suffers from the space charge effects whenever it is subjected to high DC voltage. It is believed that space charge causes pre-mature breakdown of cable insulation. Therefore measurement of space charge in cable insulation is considered very important in view of it's use in HVDC transmission. The Pulsed Electroacoustic (PEA) method is generally used in the measurement of space charge in polymeric insulation. All the experiments were performed using PEA system developed in authors' lab. In the present work authors have investigated the effect of history of voltage application on the formation of space charge in the LDPE (Low Density Polyethylene). The experiments were performed repeatedly on various film samples (100µm) taken from same lot, charge profile for all samples were similar.

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Superiority of dielectric properties of LDPE/MgO nanocomposites over microcomposites

Cited by 78 publications

References 18 publications

Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

Effect of Stretching on Electrical Properties of Low Density Polyethylene/MgO Nanocomposites

Tree initiation and growth in LDPE/MgO nanocomposites and roles of nano fillers

Space charge dynamics in LDPE

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