scholarly journals Percolation effects in the capacitive properties of metal-oxide varistors in the range of high voltage

2014 ◽  
Vol 04 (02) ◽  
pp. 1450013 ◽  
Author(s):  
A. S. Tonkoshkur ◽  
I. V. Gomilko ◽  
A. Yu Lyashkov
Keyword(s):  
Electric Field ◽  
High Voltage ◽  
Percolation Theory ◽  
Low Voltage ◽  
Chemical Compositions ◽  
Infinite Cluster ◽  
Potential Barriers ◽  
Highly Nonlinear ◽  
Capacitive Properties ◽  
Manufacturing Techniques

C–V characteristics of ZnO -based ceramic structures used in manufacturing high-voltage and low-voltage varistors of different chemical compositions and manufacturing techniques have been investigated. A correlation between the intensity of electric field corresponding to transition of the C–V characteristics to the negative capacitances and average sizes of grains of a varistor structure has been established. Obtained data have been interpreted with the use of notions of the percolation theory of electric conductivity. The Shklovskii–De Gennes model has been used. It has been shown that on the highly nonlinear segment of C–V characteristics of a varistor structure, the size of an infinite cluster are limited to several intercrystallite potential barriers. This result is observed in all kinds of investigated varistor ceramics.

Analysis of nonlinear electric field of hvdc wall bushing with a finite element approach

Open Physics ◽  
2005 ◽  
Vol 3 (4) ◽  
Author(s):  
Liming Dai ◽  
Longfu Luo
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
High Voltage ◽  
Element Analysis ◽  
Nonlinear Characteristics ◽  
High Voltage Direct Current ◽  
Numerical Iteration ◽  
Numerical Assessment ◽  
Highly Nonlinear ◽  
Element Approach

AbstractThe present research intends to establish a numerical model, on the basis of a theoretical analysis, for describing and analyzing the electric field of High Voltage Direct Current (HVDC) wall bushing that demonstrates highly nonlinear characteristics. The wall bushing is subjected high voltage with nonlinear electric field and the relationship between the electric field intensity and the resistance of the insulators of the wall bushing is highly nonlinear. With a parameter design language of a Finite Element Analysis software package for carrying out the numerical calculations, the effects of the nonlinearity on the electric field can be well taken into consideration in performing the numerical assessment. A technique utilizing the numerical iteration is developed for quantifying the electric intensity of the electric field. With the model and the iteration technique established, the nonlinear characteristics of the HVDC wall bushing can be investigated with efficiency.

Low Voltage Electrohydrodynamic Micropump for Cooling of Electronic Device

2011 ◽  
Author(s):  
Comlan Fandohan ◽  
A. G. Agwu Nnanna
Keyword(s):  
Electric Field ◽  
Flow Rate ◽  
High Voltage ◽  
Electric Potential ◽  
Low Voltage ◽  
Electronic Device ◽  
Dielectric Material ◽  
Maximum Velocity ◽  
High Heat ◽  
Dielectric Fluid

To dissipate the high heat generated in microprocessors and electronic components, electrohydrodynamic (EHD) micropumps are often used. An EHD system involves the interaction of a flow field and an applied electric field; specifically, an ion-drag EHD micropump uses the interaction of an electric field with electric charges, dipoles or particles embedded in a dielectric fluid in order to generate a net flow. These EHD micropumps, require high voltage to drive the fluid, and as a result have not gained wide application. This study presents a systematic analytical method of reducing the high voltage requirement. The approach is to select a dielectric material such that flow rate is maximized with low electric potential. It is known that the dielectric maximum velocity is a function of the dielectric potential, dielectric permittivity, and viscosity. In this paper, a flow rate is assumed to be sufficient. The electric potential is decreased by selecting the appropriate fluid. Fluid of high permittivity and low viscosity will enhance the potential factor there by, decreasing the potential.

Modeling and Analysis of Small Scale High-Voltage Charging Circuit under Discrete Time Domain

2011 ◽  
Vol 130-134 ◽  
pp. 3386-3391
Author(s):  
Yong Qiang Wang ◽  
Yi Di Wu ◽  
Yun Yan Wang ◽  
Chang Lin Liu
Keyword(s):  
Discrete Time ◽  
High Voltage ◽  
Time Domain ◽  
Low Voltage ◽  
Research Topic ◽  
Domain Model ◽  
Small Scale ◽  
Large Signal ◽  
Modeling And Analysis ◽  
Highly Nonlinear

Small scale high-voltage flyback charging circuit is the key unit of the initiating experiment device of slapper detonator, which converts the initiating energy from low voltage to high voltage and stores the energy in a high voltage capacitor. It is a highly nonlinear system, of which the research topic is the process of the establishment of the output voltage—an area which belongs to large signal transients. This has made the research of this topic difficult and progress slowly. In this paper, in order to study the characteristics as well as the rules of the charging process for the purpose of design optimization, the discrete time domain model of the flyback charging circuit is built and simulated. Experimental results are given and show that the model presented in this paper is instrumental for the optimization of the high voltage charging circuit.

Numerical Assessment of Nonlinear Electric Field of HVDC Wall Bushing

2005 ◽  
Author(s):  
L. Luo ◽  
L. Dai
Keyword(s):  
Electric Field ◽  
High Voltage ◽  
Element Analysis ◽  
Nonlinear Characteristics ◽  
High Voltage Direct Current ◽  
Numerical Iteration ◽  
Numerical Assessment ◽  
Highly Nonlinear ◽  
The Relationship ◽  
Iteration Technique

A numerical model is established in the present research on the basis of a theoretical analysis, for describing and analyzing the electric field of High Voltage Direct Current (HVDC) wall bushing that demonstrates highly nonlinear characteristics. The relationship between the electric field intensity and the resistance of the insulators of the wall bushing is highly nonlinear and the wall bushing is subjected high voltage with nonlinear electric field. A numerical iteration technique is developed with the Parameter Design Language (PDL) of a Finite Element Analysis software package for carrying out the numerical calculations. The nonlinear characteristics of the HVDC wall bushing are investigated with the model and the iteration technique established. The methodology presented in the research provides a new approach for designing and manufacturing the HVDC wall bushing.

Electric Field Orientation for Gene Delivery Using High-Voltage and Low-Voltage Pulses

2012 ◽  
Vol 245 (10) ◽  
pp. 661-666 ◽  
Author(s):  
J. Orio ◽  
M. Coustets ◽  
C. Mauroy ◽  
J. Teissie
Keyword(s):  
Gene Delivery ◽  
Electric Field ◽  
High Voltage ◽  
Low Voltage ◽  
Field Orientation ◽  
Voltage Pulses

Low-Voltage Variable Gain Current Amplifier for High-Voltage Signal Processing

2009 ◽  
Vol 129 (8) ◽  
pp. 1511-1517
Author(s):  
Nicodimus Retdian ◽  
Jieting Zhang ◽  
Takahide Sato ◽  
Shigetaka Takagi
Keyword(s):  
Signal Processing ◽  
High Voltage ◽  
Low Voltage ◽  
Current Amplifier ◽  
Variable Gain ◽  
Voltage Signal

PEMANFAATAN RADIASI ENERGI TEGANGAN 150 KV UNTUK LAMPU LED PENERANGAN JALAN

Jurnal Teknik ◽  
2018 ◽  
Vol 7 (1) ◽  
Author(s):  
Mauludi Manfaluthy
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
High Voltage ◽  
Low Frequency ◽  
Energy Utilization ◽  
World Health ◽  
Electromagnetic Signals ◽  
Health Organization ◽  
The Magnetic Field ◽  
Low Frequency Waves

WHO (World Health Organization) concludes that not much effect is caused by electric field up to 20 kV / m in humans. WHO standard also mentions that humans will not be affected by the magnetic field under  100 micro tesla and that the electric field will affect the human body with a maximum standard of 5,000 volts per meter. In this study did not discuss about the effect of high voltage radiation SUTT (High Voltage Air Channel) with human health. The research will focus on energy utilization of SUTT radiation. The combination of electric field and magnetic field on SUTT (70-150KV) can generate electromagnetic (EM) and radiation waves, which are expected to be converted to turn on street lights around the location of high voltage areas or into other forms. The design of this prototype works like an antenna in general that captures electromagnetic signals and converts them into AC waves. With a capacitor that can store the potential energy of AC and Schottky diode waves created specifically for low frequency waves, make the current into one direction (DC). From the research results obtained the current generated from the radiation is very small even though the voltage is big enough.Keywords : Radiance Energy, Joule Thief, and  LED Module.

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