Flame Retardancy and Excellent Electrical Insulation Performance of RTV Silicone Rubber

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2854
Author(s):  
Muhammad Tariq Nazir ◽  
Arslan Khalid ◽  
Imrana Kabir ◽  
Cheng Wang ◽  
Juan-Carlos Baena ◽  
...  
Keyword(s):  
Flame Retardancy ◽  
Silicone Rubber ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Volume Resistivity ◽  
Electrical Insulation ◽  
Outdoor Insulation ◽  
Power Frequency ◽  
A Minor ◽  
Rtv Silicone Rubber

Room temperature vulcanized (RTV) silicone rubber filled with aluminum trihydrate (ATH) is substantially engaged in electrical outdoor insulation applications. The pristine silicone rubber is highly combustible. ATH filled silicone rubber offers excellent electrical insulation but lacks in providing adequate flame retardancy. This short communication reports the novel results on improved flame retardancy of pristine and ATH filled silicone rubber whilst retaining the electrical insulation properties to a great extent. Results suggest that the presence of only one percent of graphene nanoplatelets with ATH sharply reduces the heat release rate and rate of smoke release. A minor reduction in dielectric breakdown strength and volume resistivity is noticed. Furthermore, permittivity and dielectric loss at power frequency suggest that a marginal 1% concentration of nanoplatelet with ATH is an excellent approach to fabricate flame retardant silicone rubber with an acceptable electrical insulation level.

Electrical Insulation Property of Silicone Rubber Tube in High Elevations

2012 ◽  
Vol 503-504 ◽  
pp. 1006-1009
Author(s):  
Guo Min Li ◽  
Chuan Li ◽  
Yun Shui Xu ◽  
Qing Hua Yan ◽  
Shao Quan Zhang ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
High Potential ◽  
Electrical Insulation ◽  
Chain Molecule ◽  
Rubber Tube ◽  
Insulation Property ◽  
Power Frequency ◽  
Test Voltage ◽  
High Elevations ◽  
Potential Test

Silicone rubber is a polymer with the chain molecule structure of Si-O bond [1]. At the environment of 1970 m elevation, the power frequency withstand voltage and condensation experiments will be tested by using two silicone rubber tubes with length of 300mm and 330mm, which lasts one minute, under 85kV. In the high potential test, the silicone rubber tube does not appear the flashover when the surface of tubes weren’t polluted. However, the test voltage increases to 70kV and the surface of the silicone rubber tube will appear flashover, when the tubes are plated in the condensation conditions. The high potential experiments indicate that the electrical insulation property of silicone rubber tube is seriously debated in the humidity environment.

scholarly journals Volume and Surface Resistivity Measurement of Insulating Materials Using Guard-Ring Terminal Electrodes

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2811
Author(s):  
Heon-Gyeong Lee ◽  
Jin-Gyu Kim
Keyword(s):  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Resistivity Measurement ◽  
Volume Resistivity ◽  
Surface Resistivity ◽  
International Standards ◽  
Guard Ring ◽  
International Electrotechnical Commission ◽  
Renewable Energy Resources ◽  
Insulating Materials

Recently, eco-friendly energy conversion policies have been being promoted through de-nuclearization and de-coal. For this purpose, a super grid should be built to optimize sustainable renewable energy resources such as solar and wind power. Accordingly, considering the various problems such as technology and cost, a system for efficient energy transmission is required. Hence, research is being actively conducted to apply it, owing to the development of the high voltage direct current (HVDC) system. Among HVDC systems, the cable system is extremely important, in addition to the measurement of the dielectric breakdown strength, space charge, and volume resistivity of insulating materials. The existing resistivity measurement method measures both the volume and surface resistivity using a three-terminal electrode that is used in the international standards of American Society for Testing and Materials (ASTM) D 257 and International Electrotechnical Commission (IEC) 60093. However, the circuit configuration differs depending on the measurement of the volume and surface resistivity; moreover, when a DC voltage is applied to the insulator, a charging current flows and there are multiple samples to be measured, which takes a considerable amount of time. Therefore, in this study, we proposed a new type of resistivity measurement system that is based on the existing three-terminal electrode system. Furthermore, we produced a system capable of simultaneously measuring the volume and surface resistivity. Finally, using this system, we compared and analyzed the volume and surface resistivity of five insulating materials.

scholarly journals Enhanced Insulation Performances of Crosslinked Polyethylene Modified by Chemically Grafting Chloroacetic Acid Allyl Ester

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 592 ◽  
Author(s):  
Xin-Dong Zhao ◽  
Wei-Feng Sun ◽  
Hong Zhao
Keyword(s):  
Space Charge ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Chloroacetic Acid ◽  
Dielectric Materials ◽  
Electrical Insulation ◽  
Polar Group ◽  
Charge Accumulation ◽  
Allyl Ester ◽  
Electrical Insulation Properties

Modified crosslinked polyethylene (XLPE) with appreciably enhanced DC electrical insulation properties has been developed by chemical modification of grafting chloroacetic acid allyl ester (CAAE), exploring the trapping mechanism of charge transport inhibition. The bound state traps deriving from grafted molecule are analyzed by first-principles calculations, in combination with the electrical DC conductivity and dielectric breakdown strength experiments to study the underlying mechanism of improving the electrical insulation properties. In contrast to pure XLPE, the XLPE-graft-CAAE represents significantly suppressed space charge accumulation, increased breakdown strength, and reduced conductivity. The substantial deep traps are generated in XLPE-graft-CAAE molecules by polar group of grafted CAAE and accordingly decrease charge mobility and raise charge injection barrier, consequently suppressing space charge accumulation and charge carrier transport. The well agreement of experiments and quantum mechanics calculations suggests a prospective material modification strategy for achieving high-voltage polymer dielectric materials without nanotechnology difficulties as for nanodielectrics.

scholarly journals Improved thermal conductivity and AC dielectric breakdown strength of silicone rubber/BN composites

2020 ◽  
Vol 2 ◽  
pp. 100023
Author(s):  
Maryam Sarkarat ◽  
Michael Lanagan ◽  
Dipankar Ghosh ◽  
Andrew Lottes ◽  
Kent Budd ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicone Rubber ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Dielectric Breakdown Strength

Mechanical and dielectric properties of epoxy composites filled with hybrid aluminum particles with binary size distribution

2017 ◽  
Vol 31 (1) ◽  
pp. 124-134 ◽  
Author(s):  
Ying Gong ◽  
Wenying Zhou ◽  
Xuezhen Sui ◽  
Yujia Kou ◽  
Li Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Size Distribution ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Relative Weight ◽  
Volume Resistivity ◽  
Epoxy Composites ◽  
Hybrid Particles ◽  
Hybrid Filler

Epoxy composites incorporated with three kinds of hybrid aluminum (Al) particles with binary size distribution, that is, [1 μm/45 μm], [1 μm/18 μm], and [18 μm/45 μm], respectively, were prepared, and the mechanical and dielectric properties of the hybrid Al/epoxy composites were investigated as a function of relative weight fraction of smaller-size Al ( Ws) of hybrid Al particles at a total filler content of 50 wt%. The mechanical and electrical properties of the hybrid Al/epoxy composites are found to mainly depend on the type of hybrid filler and the Ws and can be tuned by changing the Ws. The maximum tensile strength and elongation at break of the composites appear at an optimal Ws. Furthermore, the dielectric permittivity, dielectric breakdown strength, and volume resistivity of the hybrid Al/epoxy composites also exhibit the similar variations as the mechanical properties with the Ws. The obvious enhancements in the physical properties can be ascribed to the synergistic effect of hybrid particles in the matrix at the optimal Ws, which endows the composites with better mechanical and dielectric properties. So, the results give a facile strategy to enhance the dielectric and mechanical properties of the composites by choosing a proper Ws at a fixed total filler loading.

Round Robin Testing of RTV Silicone Rubber Coatings for Outdoor Insulation

1996 ◽  
Vol 16 (10) ◽  
pp. 59-60 ◽  
Author(s):  
S. Gorur ◽  
E. Cherney ◽  
C. de Tourreil ◽  
D. Dumora ◽  
R. Hackam ◽  
...  
Keyword(s):  
Silicone Rubber ◽  
Round Robin ◽  
Outdoor Insulation ◽  
Rubber Coatings ◽  
Rtv Silicone Rubber

scholarly journals Significantly Enhanced Electrical Performances of Eco-Friendly Dielectric Liquids for Harsh Conditions with Fullerene

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 989 ◽  
Author(s):  
Zhengyong Huang ◽  
Feipeng Wang ◽  
Qiang Wang ◽  
Wei Yao ◽  
Kai Sun ◽  
...  
Keyword(s):  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Volume Resistivity ◽  
Dissipation Factor ◽  
Potential Method ◽  
Dielectric Liquid ◽  
Dielectric Liquids ◽  
Performance Deterioration ◽  
Insulating Liquid ◽  
Harsh Conditions

The eco-friendly vegetable liquid is increasingly used because of the growing demand for environmentally friendly dielectric liquid. A vegetable liquid/fullerene nanofluid was fabricated via ultrasonic processing with good dispersion of the fullerene nanoparticles. It was observed that a small amount of fullerene (~100 mg/L) can significantly improve the electrical properties of vegetable insulating liquid (dissipation factor decreased by 20.1%, volume resistivity increased by 23.3%, and Alternating Current (AC) dielectric breakdown strength increased by 8.6%). Meanwhile, the trace amount of fullerene is also able to improve the electrical performances (i.e., dissipation factor and electrical resistivity) of the vegetable nanofluid under harsh conditions of long-term thermal aging compared with the blank contrast. The reduced acid values (25%) and dissolved decomposition gases (58.2% for hydrogen) in the aged vegetable nanofluid indicate the inhibition of molecule decomposition of vegetable liquid with fullerene. The improved electrical performances and thermal resistance of the vegetable nanofluid contribute to the electron affinity of fullerene proved by calculation of electron density distribution on the surface. The thermogravimetric analysis of the nanofluid under different atmospheres interprets that the oxygen absorbed inevitably in the fullerene contributes to the performance deterioration of the nanofluids during the initial aging. This work provides a potential method towards eco-friendly dielectric liquid with great electrical performances for harsh environments.

Electrical insulation properties of silicone rubber under accelerated corona and thermal aging

2020 ◽  
Author(s):  
El Hadi Belhiteche ◽  
Sébastien Rondot ◽  
Mustapha Moudoud ◽  
Philippe Dony ◽  
Omar Jbara
Keyword(s):  
Silicone Rubber ◽  
Thermal Aging ◽  
Electrical Insulation ◽  
Electrical Insulation Properties
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