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.

Resistivity and Dielectric Measurements of Pb(Mn0.5 W0.5)O3 Ceramics with Guard Ring Electrode

2012 ◽  
Vol 602-604 ◽  
pp. 495-498
Author(s):  
Maung Maung Yin ◽  
Than Win Than ◽  
Yee Thein Pwint ◽  
Kyaw Soe Ko Ko
Keyword(s):  
Volume Resistivity ◽  
Ring Electrode ◽  
Small Sample ◽  
Surface Resistivity ◽  
Guard Ring ◽  
Dielectric Measurements ◽  
Reaction Route ◽  
Insulating Material ◽  
Tan Δ ◽  
Parallel Resistance

Polycrystalline Pb(Mn0.5W0.5)O3, PMW, a ferroelectric oxide was prepared by high temperature solid state reaction route. In order to reduce the measurement error caused by edge capacitance, laboratory-made three-terminal ring electrode (including a guard terminal) was constructed. A guard ring electrode eliminated parallel resistance paths that could cause errors in materials resistance measurements. Guard ring electrodes were useful devices which enable accurate dielectric measurements to be made on small sample of insulating material. The dielectric constant (ε′) and loss tangent (tan δ) of PMW ceramics were measured as a function of frequency ( 1 kHz- 100 kHz ). The volume resistivity and surface resistivity of PMW ceramics were also investigated. The smallest value of volume and surface resistivity were found to be 1.6 × 10-4 MΩ and 0.1281 MΩ, respectively.

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.

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.

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.

scholarly journals Dielectric Breakdown Strength and Energy Storage Density of CCTO-ZBS Electroceramic

2020 ◽  
Vol 596 ◽  
pp. 012006
Author(s):  
Muhammad Qusyairie Saari ◽  
Julie Juliewatty Mohamed ◽  
Muhammad Azwadi Sulaiman ◽  
Mohd Fariz Abd Rahman ◽  
Zainal Arifin Ahmad ◽  
...  
Keyword(s):  
Energy Storage ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Energy Storage Density ◽  
Dielectric Breakdown Strength ◽  
Storage Density

scholarly journals Construction of a Three-Dimensional BaTiO3 Network for Enhanced Permittivity and Energy Storage of PVDF Composites

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3585
Author(s):  
Xueqing Bi ◽  
Lujia Yang ◽  
Zhen Wang ◽  
Yanhu Zhan ◽  
Shuangshuang Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Polyvinylidene Fluoride ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Sol Gel ◽  
Three Dimensional ◽  
Low Dielectric ◽  
Energy Storage Properties ◽  
Discharge Energy Density ◽  
Pure Pvdf

Three-dimensional BaTiO3 (3D BT)/polyvinylidene fluoride (PVDF) composite dielectrics were fabricated by inversely introducing PVDF solution into a continuous 3D BT network, which was simply constructed via the sol-gel method using a cleanroom wiper as a template. The effect of the 3D BT microstructure and content on the dielectric and energy storage properties of the composites were explored. The results showed that 3D BT with a well-connected continuous network and moderate grain sizes could be easily obtained by calcining a barium source containing a wiper template at 1100 °C for 3 h. The as-fabricated 3D BT/PVDF composites with 21.1 wt% content of 3D BT (3DBT–2) exhibited the best comprehensive dielectric and energy storage performances. An enhanced dielectric constant of 25.3 at 100 Hz, which was 2.8 times higher than that of pure PVDF and 1.4 times superior to the conventional nano–BT/PVDF 25 wt% system, was achieved in addition with a low dielectric loss of 0.057 and a moderate dielectric breakdown strength of 73.8 kV·mm−1. In addition, the composite of 3DBT–2 exhibited the highest discharge energy density of 1.6 × 10−3 J·cm−3 under 3 kV·mm−1, which was nearly 4.5 times higher than that of neat PVDF.

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