Novel high voltage polymer insulators using computational and data-driven techniques

2021 ◽  
Vol 154 (17) ◽  
pp. 174906
Author(s):  
Deepak Kamal ◽  
Huan Tran ◽  
Chiho Kim ◽  
Yifei Wang ◽  
Lihua Chen ◽  
...  
Keyword(s):  
High Voltage ◽  
Data Driven ◽  
Polymer Insulators

scholarly journals Feasibility Study on Electrical Properties of 20 kV Polymeric Insulator Dry Test and Rainwater Test

2021 ◽  
Vol 17 (4) ◽  
Author(s):  
Abdul Syakur ◽  
A.I.W. Nugroho ◽  
Hermawan Hermawan
Keyword(s):  
Epoxy Resin ◽  
Leakage Current ◽  
High Voltage ◽  
Electric Power System ◽  
Insulation Resistance ◽  
Current Test ◽  
Polymer Insulator ◽  
Dry Conditions ◽  
Polymer Insulators ◽  
Ceramic Insulators

Insulator is a very important equipment in an electric power system. Ceramic insulators have been widely used to support conductors in 20 kV power lines. The problem of ceramic insulators is that they are heavy, easily contaminated on the surface and require a lot of energy in the manufacturing process. Therefore, polymer insulators were developed. This paper presents the design of an epoxy resin polymer insulator with Titanium Dioxide (TiO2) as a nanofiller. The leakage current test was carried out in a high voltage laboratory by applying an AC high voltage of 50 Hz to the insulator dry conditions and the insulator wetted by rainwater contaminants. The results of the leakage current test in dry conditions are 487.6 μA, rainwater contaminated conditions are 594.93 μA, insulation resistance in dry conditions is 2.07 G-Ohms, and contaminated conditions are 1.41 G-Ohms. Based on the test results show that the insulator leakage current increases up to 22% when the surface of the insulator is contaminated with rainwater. Meanwhile, the insulation resistance decreased by up to 32% in conditions contaminated with rainwater. The value of leakage current and insulation resistance indicates that the epoxy resin insulator with TiO2 as filler is electrically feasible to use.

scholarly journals Monitoring System of High Voltage Dielectric Equipment

2021 ◽  
Vol 288 ◽  
pp. 01088
Author(s):  
Aleksandr V. Golenishchev-Kutuzov ◽  
Vadim A. Golenishchev-Kutuzov ◽  
Dmitry A. Ivanov ◽  
Anton V. Semennikov ◽  
Tatyana G. Galieva
Keyword(s):  
High Voltage ◽  
Residual Life ◽  
Electrical Equipment ◽  
Partial Discharges ◽  
Premature Aging ◽  
Complex Method ◽  
Sufficient Degree ◽  
Polymer Insulators ◽  
Kinetics Of ◽  
Kinetics Of Reduction

Based on the research of the main causes of dielectric elements premature aging and electrical destruction of primary dielectric elements in high voltage electrical equipment the complex method for remote monitoring of said electrical equipment has been developed. The developed mobile diagnostic device is allowing detection and periodic control of the most dangerous defects. The set of diagnostic parameters of defects was experimentally obtained by using three physical methods (electromagnetic, optical, and acoustic), and allows to inspect the origin and development of defects, and to determine residual life of dielectric elements with a sufficient degree of reliability. The researched characteristics of the kinetics of reduction in operating parameters of polymer insulators permitted the development of the detection of accelerated increase in defects under the influence of ultra-large partial discharges.

scholarly journals Effect of partial discharges on the operating condition of high-voltage insulators

2019 ◽  
Vol 124 ◽  
pp. 03001 ◽  
Author(s):  
A. V. Golenishchev-Kutuzov ◽  
V. A. Golenishchev-Kutuzov ◽  
D. A. Ivanov ◽  
G. D. Mardanov ◽  
A. V. Semennikov ◽  
...  
Keyword(s):  
High Voltage ◽  
Partial Discharges ◽  
Complex Method ◽  
Physical Processes ◽  
Electric Field Gradients ◽  
Remote Diagnostics ◽  
Field Gradients ◽  
Measurement Results ◽  
Local Areas ◽  
Polymer Insulators

The features of the dielectric rod defects and the rod-electrod defects of polymer insulators were investigated by using the developed complex method of contactless remote diagnostics of high-voltage insulators health, which includes the initial detection of local areas with elevated electric field gradients as well as measurement of a set of partial discharges characteristics. The radiation of extra-large partial discharges was detected and partial discharges features were investigated. According to the measurement results, a diagram was constructed for the electro-physical processes that accompany the emission of extra-large partial discharges; and the reasons for their occurrence were established.

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

2015 ◽  
Vol 33 (1) ◽  
pp. 213-219 ◽  
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.

scholarly journals Remote testing for defects in service high-voltage insalators

2020 ◽  
Vol 22 (2) ◽  
pp. 117-127
Author(s):  
A. V. Golenishchev-Kutuzov ◽  
L. V. Akhmetvaleeva ◽  
G. R. Enikeeva ◽  
D. A. Ivanov ◽  
A. V. Semennikov ◽  
...  
Keyword(s):  
High Voltage ◽  
Technical Condition ◽  
Operating Conditions ◽  
Remote Measurement ◽  
Dielectric Surfaces ◽  
Significant Difference ◽  
Diagnostic Signs ◽  
Tunable Receiver ◽  
Polymer Insulators ◽  
Positive Half

On the basis of the two-channel remote measurement method previously developed at the Department of PES KGEU, a set of characteristics of the PD with the simultaneous use of electromagnetic and acoustic sensors, which allows you to remotely measure and evaluate the technical condition of high-voltage insulators (HVI). The article presents the results of developments in the development of the previously proposed method, which allowed to determine not only the type and location of the defect, but also its size and the degree of influence on the working condition of the VI. Particular attention is paid to the evolution of defects under the influence of overvoltage and other electrophysical processes in operating conditions. In particular, the generation of ultra-large PDs that can create erosion of the dielectric surfaces of defects was recently discovered, and the technical condition of highvoltage polymer insulators was examined. All measurements were performed on an experimental bench by non-contact receiving pulse signals of the PD by an electromagnetic tunable receiver in the range of 50-600 MHz. Their indication and computer processing were carried out in order to determine in each of the discrete intervals of the phase voltage the average values of the number and intensity of PD pulses, which either do not exceed the allowable threshold for the occurrence of defects and their development, in comparison with the reference HVI, or exceed it. Based on the results of preliminary bench tests on model specimens and real HVIs under operating conditions, and the obtained set of PD parameters, diagnostic signs were established that made it possible to determine the type, location of the most dangerous defects and the degree of their influence on the HVI working capacity. At the same time, the presence of the most dangerous defects is determined by the expansion of the phase intervals of PD radiation, a sharp increase in PD in negative half-periods of high voltage compared with positive half-periods, and also by a significant difference in the width and shape of single PD pulses.

High Voltage Electron Microscopy of Ion-Milled Dental Enamel

1974 ◽  
Vol 32 ◽  
pp. 60-61
Author(s):  
L. D. Ackerman ◽  
S. H. Y. Wei
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Third Molar ◽  
Polarized Light ◽  
Dental Enamel ◽  
Longitudinal Section ◽  
Ion Milling ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron

Mature human dental enamel has presented investigators with several difficulties in ultramicrotomy of specimens for electron microscopy due to its high degree of mineralization. This study explores the possibility of combining ion-milling and high voltage electron microscopy as a means of circumventing the problems of ultramicrotomy.A longitudinal section of an extracted human third molar was ground to a thickness of about 30 um and polarized light micrographs were taken. The specimen was attached to a single hole grid and thinned by argon-ion bombardment at 15° incidence while rotating at 15 rpm. The beam current in each of two guns was 50 μA with an accelerating voltage of 4 kV. A 20 nm carbon coating was evaporated onto the specimen to prevent an electron charge from building up during electron microscopy.

Three-Dimensional Visualization of the T-System of Frog Muscle Using High Voltage Electron Microscopy and a Lanthanum Stain

1977 ◽  
Vol 35 ◽  
pp. 570-571 ◽  
Author(s):  
Lee D. Peachey ◽  
Clara Franzini-Armstrong
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Three Dimensional ◽  
Biological Tissues ◽  
High Voltage Electron Microscopy ◽  
Transverse Tubular System ◽  
Peroxidase Reaction ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
T System

The effective study of biological tissues in thick slices of embedded material by high voltage electron microscopy (HVEM) requires highly selective staining of those structures to be visualized so that they are not hidden or obscured by other structures in the image. A tilt pair of micrographs with subsequent stereoscopic viewing can be an important aid in three-dimensional visualization of these images, once an appropriate stain has been found. The peroxidase reaction has been used for this purpose in visualizing the T-system (transverse tubular system) of frog skeletal muscle by HVEM (1). We have found infiltration with lanthanum hydroxide to be particularly useful for three-dimensional visualization of certain aspects of the structure of the T- system in skeletal muscles of the frog. Specifically, lanthanum more completely fills the lumen of the tubules and is denser than the peroxidase reaction product.

Resolution, Contrast and Interpretation of HVEM Images of Crystals

1973 ◽  
Vol 31 ◽  
pp. 228-229
Author(s):  
L. E. Thomas ◽  
J. S. Lally ◽  
R. M. Fisher
Keyword(s):  
High Voltage ◽  
Chromatic Aberration ◽  
Crystalline Materials ◽  
Resolution Parameter ◽  
Instrument Resolution ◽  
Imaging Conditions ◽  
Beam Excitation ◽  
Optimum Imaging

In addition to improved penetration at high voltage, the characteristics of HVEM images of crystalline materials are changed markedly as a result of many-beam excitation effects. This leads to changes in optimum imaging conditions for dislocations, planar faults, precipitates and other features.Resolution - Because of longer focal lengths and correspondingly larger aberrations, the usual instrument resolution parameter, CS174 λ 374 changes by only a factor of 2 from 100 kV to 1 MV. Since 90% of this change occurs below 500 kV any improvement in “classical” resolution in the MVEM is insignificant. However, as is widely recognized, an improvement in resolution for “thick” specimens (i.e. more than 1000 Å) due to reduced chromatic aberration is very large.

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