High improvement in trap level density and direct current breakdown strength of block polypropylene by doping with a β-nucleating agent

2018 ◽  
Vol 112 (9) ◽  
pp. 091902 ◽  
Author(s):  
Chong Zhang ◽  
Jun-Wei Zha ◽  
Hong-Da Yan ◽  
Wei-Kang Li ◽  
Zhi-Min Dang
Keyword(s):  
Direct Current ◽  
Breakdown Strength ◽  
Level Density ◽  
Nucleating Agent ◽  
Trap Level

Filler concentration effect on breakdown strength and trap level of epoxy resin–Al2O3 nanocomposites

2020 ◽  
Author(s):  
Muhammad Zeeshan khan ◽  
Feipeng Wang ◽  
Aashir Waleed ◽  
Zhengyong Huang ◽  
Muhammad Arshad Shehzad Hassan ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Breakdown Strength ◽  
Concentration Effect ◽  
Filler Concentration ◽  
Trap Level

Trap Property and Charge Transmission in PE

2020 ◽  
pp. 129-155
Keyword(s):  
Charge Transfer ◽  
Electrical Properties ◽  
Space Charge ◽  
Transfer Process ◽  
Breakdown Strength ◽  
Electrical Performance ◽  
Trap Level ◽  
Charge Transfer Process ◽  
Direct Current Conductivity ◽  
Trapping Process

The electrical properties of the dielectric are achieved by affecting the charge transfer process. The trap characteristics have an important influence on the electrical properties of the dielectric by affecting the charge transfer process. Aggregation and trap level characteristics of nanographene on low density polyethylene (LDPE). The direct current conductivity, breakdown strength, trap level distribution, space charge distribution, and charge mobility of nanocomposites were investigated. The experimental results show that the interface region between graphene and polymer introduces many deep traps in the forbidden band of nanocomposites, which can reduce the trapping process of charge and inhibit the accumulation of space charge. This indicates that the addition of nanoscale graphene has a significant improvement in the electrical performance of high voltage DC cables, which will provide a reference for production and application.

scholarly journals Dielectric and Thermal Conductivity of Epoxy Resin Impregnated Nano-h-BN Modified Insulating Paper

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1359 ◽  
Author(s):  
Hongda Yang ◽  
Qingguo Chen ◽  
Xinyu Wang ◽  
Minghe Chi ◽  
Heqian Liu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Dielectric Properties ◽  
Space Charge ◽  
Epoxy Resin ◽  
Direct Current ◽  
Heat Conductivity ◽  
Power Transmission ◽  
Breakdown Strength ◽  
Hexagonal Boron Nitride ◽  
Insulating Paper

Epoxy resin-impregnated insulation paper (RIP) composites are used as the inner insulation of dry condenser bushing in the ultra-high voltage direct current (UHVDC) power transmission system. To improve the dielectric properties and heat conductivity of RIP, hexagonal boron nitride (h-BN) nano-flakes are added to the insulation paper at concentrations of 0–50 wt % before impregnation with pure epoxy resin. X-ray diffraction (XRD), scanning electron microscopy (SEM) observations, thermal conductivity as well as the typical dielectric properties of direct current (DC) volume conductivity. DC breakdown strength and space charge characteristics were obtained. The maximum of nano-h-BN modified heat conductivity reach 0.478 W/(m·K), increased by 139% compared with unmodified RIP. The DC breakdown electric field strength of the nano-h-BN modified RIP does not reduce much. The conductivity of nano-h-BN modified is less sensitive to temperature. As well, the space charge is suppressed when the content is 50 wt %. Therefore, the nano-h-BN modified RIP is potentially useful in practical dry DC bushing application.

Enhanced direct‐current breakdown strength of Al 2 O 3 /epoxy resin composites through plasma fluoridation of fillers interface

2021 ◽  
Author(s):  
Fang‐cheng Lü ◽  
Jing‐xuan Song ◽  
Hao‐ou Ruan ◽  
Mei‐ying Zhu ◽  
Shuang‐shuang Wang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Direct Current ◽  
Breakdown Strength ◽  
Resin Composites ◽  
Epoxy Resin Composites

Collection of Breakdown and Discharge Research on Advanced Materials

2021 ◽  
pp. 1505-1538
Keyword(s):  
Surface Charge ◽  
Epoxy Resin ◽  
Breakdown Strength ◽  
Advanced Materials ◽  
Surface Discharge ◽  
Trap Level ◽  
Mass Fractions ◽  
New Material ◽  
Application Potential ◽  
Discharge Behavior

Epoxy resins are widely used to build insulators in GIL. Epoxy/AlN nanocomposite can be produced by adding AlN nanoparticals to the epoxy resin. By studying the surface discharge behavior of the nanocomposites under different operating temperature, it is helpful to improve the creeping voltage of epoxy resin. Polypropylene is a kind of material which is usually chosen to build film capacitors. The effects of voltage form on surface charge and discharge behavior were studied. Furthermore, a modification method of a polypropylene film which can suppress surface charge accumulation is proposed. Polypropylene also has great application potential in HVDC cable insulation, provided that its toughness is to be overcome. Different mass fractions of ULDPE and graphene were added to polypropylen to improve mechanical and insulating properties, respectively. Studies on the DC conductivity, space charge behavior, trap level distribution, and breakdown strength of the new material were carried out.

scholarly journals Enhanced High-Temperature DC Dielectric Performance of Crosslinked Polyethylene with a Polystyrene Pinning Structure

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1234 ◽  
Author(s):  
Liang Cao ◽  
Lisheng Zhong ◽  
Yinge Li ◽  
Kai Zhang ◽  
Jinghui Gao ◽  
...  
Keyword(s):  
High Temperature ◽  
Direct Current ◽  
Elevated Temperatures ◽  
Breakdown Strength ◽  
Crosslinking Agent ◽  
Special Design ◽  
Insulation Materials ◽  
High Voltage Direct Current ◽  
Dielectric Performance ◽  
Test Temperature Range

In this paper, we propose a method on improving direct current (DC) dielectric performance by designing a polystyrene (PS) pinning crosslinked polyethylene (XLPE) for the application of insulation materials on high voltage direct current (HVDC) extruded cable. Electrical experimental results show that the addition of PS (1–5 phr, parts per hundreds of resin) can significantly reduce DC conductivity and increase DC breakdown strength of XLPE in the test temperature range of 30–90 °C. Microstructure investigation shows PS distributed as particles could participate in the formation of a crosslinking network with the help of a crosslinking agent, thus forming a polymer pinning structure at the interface between XLPE and PS. It is believed that such a special design strengthens the structure of XLPE, which leads to the improved DC dielectric performance at elevated temperatures. Our findings may contribute a new solution for developing HVDC cable insulation materials.

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