Life estimation and analysis of dielectric strength, hydrocarbon backbone and oxidation of high voltage multi stressed EPDM composites

2018 ◽  
Vol 5 (2) ◽  
pp. 025003 ◽  
Author(s):  
Abraiz Khattak ◽  
Muhammad Amin ◽  
Muhammad Iqbal ◽  
Naveed Abbas
Keyword(s):  
High Voltage ◽  
Dielectric Strength ◽  
Life Estimation

scholarly journals Evaluation of Tanzania local ceramic raw materials for high voltage porcelain insulators production

Cerâmica ◽  
2018 ◽  
Vol 64 (372) ◽  
pp. 570-576
Author(s):  
B. Ngayakamo ◽  
S. E. Park
Keyword(s):  
High Voltage ◽  
Bending Strength ◽  
Raw Materials ◽  
Microstructural Characterization ◽  
Dielectric Strength ◽  
Pressing Method ◽  
X Ray ◽  
Mineral Phases ◽  
Porcelain Insulators ◽  
High Voltage Porcelain

Abstract This study evaluated the potential of locally sourced-ceramic raw materials in Tanzania, Pugu kaolin, Same clay, vermiculite and feldspar, for production of high voltage porcelain insulators. The chemical, mineral phases and microstructural characterization of raw materials and porcelain samples were carried out using the X-ray fluorescence, X-ray diffraction, and scanning electron microscopy techniques, respectively. The mineral phases of the fired porcelain sample identified were mullite and quartz. The porcelain bodies were fabricated using the dry pressing method by varying the composition of the selected ceramic raw materials. The physical-mechanical properties and dielectric strength were measured for each porcelain sample. The sample with the composition of 20% Pugu kaolin, 20% Same clay, 20% vermiculite and 40% feldspar was found to have the dielectric strength of 50.8 kV.mm-1, bending strength of 20 MPa and water absorption of 0.46%, which satisfies the main requisite properties for high voltage porcelain insulators.

Laser-Based Instrument for Electric Dichroism Spectroscopy of Small Molecules

1986 ◽  
Vol 40 (4) ◽  
pp. 483-486 ◽  
Author(s):  
K. L. Jansen ◽  
J. M. Harris
Keyword(s):  
Small Molecules ◽  
High Voltage ◽  
Electronic Structures ◽  
Dielectric Strength ◽  
Voltage Source ◽  
Chemical Information ◽  
Beam Laser ◽  
Double Beam ◽  
Electric Dichroism ◽  
High Voltage Source

While the chemical information provided by electric dichroism spectroscopy can be useful for studying the conformation and electronic structures of molecules in solution, the dichroism signals produced at fields approaching the dielectric strength of organic solvents are extremely small and difficult to detect. A double-beam, laser-based instrument for electric dichroism measurements is described which allows detection of dichroism signals corresponding to changes in absorbance of less than 10−6 with only a 1.2-kV high-voltage source.

Effect of hybrid-SiO2 particles on characterization of EPDM and silicone rubber composites for outdoor high-voltage insulations

2017 ◽  
Vol 37 (7) ◽  
pp. 671-680 ◽  
Author(s):  
Hidayatullah Khan ◽  
Muhammad Amin ◽  
Muhammad Yasin ◽  
Muhammad Ali ◽  
Ayaz Ahmad
Keyword(s):  
High Voltage ◽  
Silicone Rubber ◽  
Hybrid Composites ◽  
Standard Procedure ◽  
Research Work ◽  
Dielectric Strength ◽  
Hybrid Silica ◽  
Roll Mill ◽  
Thermal And Electrical Properties

Abstract Ethylene propylene diene monomer (EPDM) and silicone rubber (SiR) are well-known polymers for high-voltage (HV) outdoor applications. In this research work, the effect of hybrid SiO2 (a mixture of 15% microsized and 5% nanosized silica) has been investigated on the mechanical, thermal, and electrical properties of EPDM and SiR composites. Using the ASTM standard procedure, the EPDM and SiR composites filled with hybrid silica were compounded by two roll mill and simple blending techniques, respectively. It was observed that with the addition of hybrid SiO2, the composites exhibited improved tensile strength of ~2500 kPa, reduced elongation at break, and enhanced hardness. The samples filled with SiR hybrid silica showed higher thermal stability and volume/surface resistivities relative to EPDM hybrid composites. However, EPDM hybrid composites showed higher dielectric strength of ~23.4 kV/mm as compared with SiR composites. From these characterization results, it can be suggested that SiR hybrid composites are more suitable for outdoor HV insulation applications.

scholarly journals Impact of Shape and Total of Particle to Characteristics of Partial Discharge and Breakdown Voltage on Oil Insulation in Uniform Field

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Daniar Fahmi ◽  
I Made Yulistya Negara ◽  
R. Wahyudi ◽  
Dimas Anton Asfani ◽  
Made Yudhi Setyawan ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
High Voltage ◽  
Partial Discharge ◽  
Dielectric Strength ◽  
Solid Particles ◽  
Uniform Field ◽  
Negative Corona

Oil insulation is one of the insulation medium types commonly used in high voltage apparatus. This insulation is to separate between the conductive part and non-conductive part. However, oil insulation can experience decreasing of dielectric strength. It may be caused by the presence of solid particles. Therefore, the testing was conducted to obtain the effect of solid particles to characteristics of partial discharge and breakdown voltage of oil insulation. The results generally proved that the existence of solid particles can reduce the breakdown voltage value of oil insulation. In addition, the solid particles led to two types of corona on oil insulation, namely positive and negative corona.

scholarly journals Arcing Behaviors in the Large-capacity HV SF6 Gas-blast Interrupters

2019 ◽  
Vol 6 (2) ◽  
pp. 140-143 ◽  
Author(s):  
S. A. Averyanova ◽  
E. Tonkonogov
Keyword(s):  
High Voltage ◽  
Short Circuit ◽  
Dielectric Strength ◽  
Numerical Results ◽  
Circuit Breakers ◽  
Large Capacity ◽  
Recovery Processes ◽  
Strength Recovery ◽  
Turbulence Effects ◽  
Short Circuit Currents

A comprehension of the dielectric strength recovery processes during the interruption of short-circuit currents in the high-voltage SF<sub>6</sub> gas-blast circuit breakers is necessary for their modernisation in order to increase the rated voltage and short circuit breaking current per one break. This paper presents numerical results of the turbulence effects on the interruption ability in the SF<sub>6</sub> extinguishing arc chamber.

Application of Unheated Cathode Thyratrons for High-Voltage High Current Pulse Series Formation

2008 ◽  
Vol 3 (4) ◽  
pp. 68-73
Author(s):  
Aleksandr V. Akimov ◽  
Petr A. Bak ◽  
Andrey A. Korepanov ◽  
Pavel V. Logachev ◽  
Viktor D. Bochkov ◽  
...  
Keyword(s):  
Current Pulse ◽  
Pulse Duration ◽  
High Voltage ◽  
Anode Voltage ◽  
Dielectric Strength ◽  
Pulse Mode ◽  
Resistive Load ◽  
Anode Current ◽  
High Current ◽  
Strength Recovery

The circuit of modulator, serving to supply inductive-resistive load in double-pulse mode with currents up to 10 kA and pulse duration of 300 ns, is described. As switching components unheated cathode thyratrons (pseudospark switches) TPI1-10k/50 and TPI5-10k/50 with anode voltage up to 50 kV have been used. The results of tests, confirming possibility of the thyratron reverse dielectric strength recovery within some microseconds after switching of 10 kA forward anode current, are presented.

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