Fabrication, mechanical, thermal, and electrical characterization of epoxy/silica composites for high-voltage insulation

Overcoming the physical limits of silicon, silicon carbide shows a high potential for making high voltage thyristors. After a simulation based optimization of the main thyristor parameters, including JTE protection and a SiO2 layer passivation, 4H-SiC GTO thyristors were realized and characterized. Designed for a theoretical blocking capability of nearly 6 kV, the electrical characterization of all device structures revealed a maximum blocking voltage of 3.5 kV. Comparing simulation and measurement suggests that a negative oxide charge density of ~ 2×1012 cm-2 causes the decrease in electrical strength.

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Electrical Characterization of High Voltage Polymer Tantalum Capacitors

Journal of The Electrochemical Society ◽

10.1149/2.036210jes ◽

2012 ◽

Vol 159 (10) ◽

pp. A1646-A1651 ◽

Cited By ~ 15

Author(s):

Y. Freeman ◽

G. F. Alapatt ◽

W. R. Harrell ◽

P. Lessner

Keyword(s):

High Voltage ◽

Electrical Characterization

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Electrical Characterization of High-Voltage 4H-SiC Diodes on High-Temperature CVD-Grown Epitaxial Layers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.389-393.1285 ◽

2002 ◽

Vol 389-393 ◽

pp. 1285-1288 ◽

Cited By ~ 2

Author(s):

Uwe Zimmermann ◽

John Österman ◽

Jie Zhang ◽

Anne Henry ◽

Anders Hallén

Keyword(s):

High Temperature ◽

High Voltage ◽

Electrical Characterization ◽

Epitaxial Layers

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A Complex Permittivity Based Sensor for the Electrical Characterization of High-Voltage Transformer Oils

Sensors ◽

10.3390/s5040302 ◽

2005 ◽

Vol 5 (4) ◽

pp. 302-316 ◽

Cited By ~ 10

Author(s):

Constantine Dervos ◽

Christos Paraskevas ◽

Panayotis Skafidas ◽

Panayota Vassiliou

Keyword(s):

High Voltage ◽

Complex Permittivity ◽

Electrical Characterization ◽

Voltage Transformer ◽

High Voltage Transformer ◽

Transformer Oils

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Electrical Characterization of a New Crosslinked Copolymer Blend for DC Cable Insulation

Energies ◽

10.3390/en13061434 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1434 ◽

Cited By ~ 1

Author(s):

Sarath Kumara ◽

Xiangdong Xu ◽

Thomas Hammarström ◽

Yingwei Ouyang ◽

Amir Masoud Pourrahimi ◽

...

Keyword(s):

Electrical Properties ◽

Electric Field ◽

Surface Potential ◽

High Voltage ◽

Direct Current ◽

Electrical Characterization ◽

Copolymer Blend ◽

New Material ◽

Potential Decay

To design reliable high voltage cables, clean materials with superior insulating properties capable of operating at high electric field levels at elevated temperatures are required. This study aims at the electrical characterization of a byproduct-free crosslinked copolymer blend, which is seen as a promising alternative to conventional peroxide crosslinked polyethylene currently used for high voltage direct current cable insulation. The characterization entails direct current (DC) conductivity, dielectric response and surface potential decay measurements at different temperatures and electric field levels. In order to quantify the insulating performance of the new material, the electrical properties of the copolymer blend are compared with those of two reference materials; i.e., low-density polyethylene (LDPE) and peroxide crosslinked polyethylene (XLPE). It is found that, for electric fields of 10–50 kV/mm and temperatures varying from 30 °C to 70 °C, the DC conductivity of the copolymer blend is in the range of 10−17–10−13 S/m, which is close to the conductivity of crosslinked polyethylene. Furthermore, the loss tangent of the copolymer blend is about three to four times lower than that of crosslinked polyethylene and its magnitude is on the level of 0.01 at 50 °C and 0.12 at 70 °C (measured at 0.1 mHz and 6.66 kV/mm). The apparent conductivity and trap density distributions deduced from surface potential decay measurements also confirmed that the new material has electrical properties at least as good as currently used insulation materials based on XLPE (not byproduct-free). Thus, the proposed byproduct-free crosslinked copolymer blend has a high potential as a prospective insulation medium for extruded high voltage DC cables.

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Temperature-dependent electrical characterization of high-voltage AlGaN/GaN-on-Si HEMTs with Schottky and ohmic drain contacts

Solid-State Electronics ◽

10.1016/j.sse.2015.04.001 ◽

2015 ◽

Vol 111 ◽

pp. 12-17 ◽

Cited By ~ 14

Author(s):

Andrzej Taube ◽

Jakub Kaczmarski ◽

Renata Kruszka ◽

Jakub Grochowski ◽

Kamil Kosiel ◽

...

Keyword(s):

High Voltage ◽

Electrical Characterization ◽

Temperature Dependent ◽

Gan On Si

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Fabrication and electrical characterization of High-Voltage silicon JFETs

Journal of Instrumentation ◽

10.1088/1748-0221/14/05/p05007 ◽

2019 ◽

Vol 14 (05) ◽

pp. P05007-P05007 ◽

Cited By ~ 2

Author(s):

G. Giacomini ◽

W. Chen ◽

D. Lynn

Keyword(s):

High Voltage ◽

Electrical Characterization

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Fabrication, mechanical, thermal, and electrical characterization of epoxy/silica composites for high-voltage insulation

Science and Engineering of Composite Materials ◽

10.1515/secm-2015-0445 ◽

2018 ◽

Vol 25 (4) ◽

pp. 753-759 ◽

Cited By ~ 6

Author(s):

Muhammad Amin ◽

Muhammad Ali ◽

Abraiz Khattak

Keyword(s):

Electrical Properties ◽

High Voltage ◽

Electrical Characterization ◽

Volume Resistivity ◽

Dielectric Strength ◽

Ceramic Materials ◽

Neat Epoxy ◽

Hardness Tests ◽

High Voltage Insulation ◽

Improved Performance

AbstractFor improved performance of epoxy, its composites were studied for high-voltage insulation. Epoxy composites may offer several advantages over neat epoxy and ceramic materials. We fabricated nano- and microepoxy/silica composites with 5 wt% nanosilica and 20 wt% microsilica, respectively. The composites and neat epoxy were studied for thermal, mechanical, and electrical properties. A thermogravimetric analyzer was used for analyzing wt% loss with temperature. Tensile and hardness tests were performed according to DIN 53504/ASTM D412 and DIN 53505/ASTM D2240 standards, respectively. Electrical properties such as dielectric strength and resistivity were tested according to IEC-60243-1 and ASTM D257/IEC 60093 standards, respectively. Neat epoxy, microcomposite, and nanocomposite showed 50% weight loss at 392°C, 410°C, and 421°C, respectively. At 550°C, nanocomposite remained at 20% of its initial weight whereas neat epoxy and microcomposite remained at 10% of their initial weights. Microcomposite and nanocomposite showed tensile strengths of 65.7 Mpa and 69.3 Mpa, respectively. Enhancements of 8% and 19% in dielectric strength were recorded for microcomposites and nanocomposites, respectively. Nanosilica greatly improved surface and volume resistivity whereas microsilica showed negligible effect on resistivity.

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Preparation and characterization of EPDM-silica nano/micro composites for high voltage insulation applications

Materials Science-Poland ◽

10.1515/msp-2015-0002 ◽

2015 ◽

Vol 33 (1) ◽

pp. 213-219 ◽

Cited By ~ 9

Author(s):

Muhammad Ali ◽

Muhammad Ahmad Choudhry

Keyword(s):

Electrical Properties ◽

High Voltage ◽

Dielectric Strength ◽

Mechanical And Thermal Properties ◽

Roll Mill ◽

Thermal And Electrical Properties ◽

High Voltage Insulation ◽

Polymer Insulators ◽

The Comparative Study

AbstractThe rising market for substitute materials in high voltage insulation components is stimulated largely by the need to reduce overall costs. In this respect, polymer insulators offer significant advantages over old traditional materials. In the present research, efforts have been made to quantify the effect of silica (having different particle size nano, micro and hybrid) loading on the mechanical and thermal behaviors of Ethylene-Propylene-Diene Monomer (EPDM) based high voltage electrical insulations. The fabricated composites were subjected to mechanical, thermal and electrical properties measurements. The results of dielectric strength, surface and volume resistivities showed that all composites had insulator properties, while their mechanical and thermal properties improved considerably. EPDM was compounded with different types of silica in a two roll mill using sulphur cure system. The outcome achieved from the comparative study revealed that the EPDM nanocomposites had enhanced mechanical, thermal and electrical properties even at 5 % loadings.

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