Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene

Li, Zhonglei; Su, Jingang; Hou, Zhende; Han, Chong

doi:10.3390/nano8110956

Cited by 18 publications

(10 citation statements)

References 29 publications

(41 reference statements)

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“…The science and technology of nanodielectrics, which are considered to be the next generation of insulating materials, have developed rapidly since the proposal of "Nanometric Dielectric" by Lewis [10], in 1994, and the redefinition of the term "Nanodielectric", by Frechette [11] in 2001. Remarkable thermal, mechanical, and dielectric properties have been achieved in nanodielectrics, due to the induced interfaces between the nanofillers and the polymer matrix [7-9, [12][13][14][15][16][17][18]. Improved tracking resistance has also been achieved in nanodielectrics, by enhancing thermal conductivity [9,19], stability of the chains [7], surface charge dissipation [20], etc.…”

Section: Introductionmentioning

confidence: 99%

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Xing

Zhang

et al. 2019

Applied Sciences

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Surface tracking has been one of the challenges for outdoor organic insulations, in electronic and electrical devices. In this paper, surface tracking behavior of nano-MgO/epoxy composite samples were measured according to the standard IEC 60112. Improved tracking resistance was obtained in nanocomposites with an 18.75% uplift in the comparative tracking index, and a decrease of 58.20% in the surface ablation area at a fixed 425 V. It was observed that the tracking resistance and surface hydrophobicity shared the same tendency—both, the comparative tracking index and surface contact angle increased with an increase of the nanofiller content. Samples with better hydrophobicity exhibited a higher tracking resistance. It could be the case that the conductive pathway of contamination was harder to form, as a result there were fewer discharging processes. With the development of surface tracking, the surface contact angle abruptly decreased, at first, and tended to be constant, which was also accomplished with the failure of samples. In addition, reduced surface resistivity was also found in the nanocomposites, which was beneficial for releasing surface charges and inhibiting distortions in the electric fields.

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Section: Introductionmentioning

confidence: 99%

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Xing

Zhang

et al. 2019

Applied Sciences

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“…In the case of nanocomposites, the trapping-detrapping process is similar to what occurs in undoped SIR. When the electrons are injected into the sample, they will be captured by the traps around needle tip induced by the interface between SIR and graphene [26,34]. However, with graphene contents lower than 0.007 wt %, the trap levels of graphene/SIR nanocomposites are higher than undoped SIR.…”

Section: Discussionmentioning

confidence: 99%

“…However, the shorter distance between graphene nanoplatelets in samples at 0.010 wt % lower the trap levels, as shown in Figure 6. This indicates that the trapped electrons need lower energy to escape and gain sufficient energy [26,34]. As a result, there is a lower inception voltage in nanocomposites at 0.010 wt %.…”

Section: Discussionmentioning

confidence: 99%

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Inhibition Effect of Graphene Nanoplatelets on Electrical Degradation in Silicone Rubber

Han

et al. 2019

Polymers

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Silicone rubber (SIR) is widely used as an insulation material in high voltage cable accessories. Electrical tree is a typical electrical degradation and is easily initiated because of the distorted electric field. In this study, graphene nanoplatelets at contents of 0.001–0.010 wt % (0.00044–0.00436 vol %) were added into SIR to improve the electrical tree inhibiting ability. Scanning electron microscopy, conductivity and surface potential decay tests were conducted to analyze the characteristics of graphene/SIR nanocomposites. The typical electrical treeing experiment was employed to observe the electrical tree inhibition of graphene in SIR. The results show that graphene nanoplatelets were well dispersed in SIR. The conductivity was higher after the addition of graphene nanoplatelets, and the trap distribution was affected by graphene nanoplatelets. The tree was changed from a bush-branch structure to a bush structure after the addition of graphene. Tree inception voltage improved and reached the highest mean value at 0.003 wt %. The tree length was inhibited at 0.001 to 0.007 wt % and the lowest tree length occurred at 0.005 wt %.

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“…Space charge accumulation can distort electric field distribution, which may lead to potential breakdown of insulation. However, not all kinds of charge accumulation can have a significant impact on breakdown while this impact can become larger at high temperatures [18,19]. In this part, the relation between space charge accumulation and electric field distortion under temperature rise and TG is discussed.…”

Section: Space Charge and Electric Field Distortionmentioning

confidence: 98%

High Temperature Insulation Materials for DC Cable Insulation — Part I: Space Charge and Conduction

Baferani

Shahsavarian

et al. 2021

IEEE Trans. Dielect. Electr. Insul.

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Fundamental studies of potential candidates for DC electric power transmission in high temperature environment, including ETFE, FEP, PTFE, PI and PEEK, are carried out and presented in form of the series papers containing space charge and conduction as part I, partial discharge as part II, and the degradation and surface breakdown as part III. In this part, the space charge at 20kV/mm was measured at 25 °C and with a thermal gradient at 50 °C. The electrical conductivity was measured at electric fields ranging from 10kV/mm to 30kV/mm in temperatures ranging from 25 °C to 200 °C. The experimental results showed that considering the effect of thermal condition and electric field, FEP has the lowest total amount of space charge accumulation and electric field distortion among these materials at the measured conditions. PI and PEEK have the lowest amount of trap-controlled mobility at 25 °C due to deeper average trap level because of the aromatic rings in the structure. PTFE and PI have the lowest amount of thermal activation energy and temperature-dependent electrical conductivity due to the more uniform morphological phase comparing to ETFE, FEP, and PEEK. The outcomes of this paper serve as a benchmark for the fundamental researches over high temperature materials for DC applications and lay a basis for Part II and Part III.

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Inhibition Effect of Graphene on Space Charge Injection and Accumulation in Low-Density Polyethylene

Cited by 18 publications

References 29 publications

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Surface Tracking of MgO/Epoxy Nanocomposites: Effect of Surface Hydrophobicity

Inhibition Effect of Graphene Nanoplatelets on Electrical Degradation in Silicone Rubber

High Temperature Insulation Materials for DC Cable Insulation — Part I: Space Charge and Conduction

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