Calculation and Analysis of Electrical Field in Valve Side Winding of Converter Transformer

2011 ◽  
Vol 383-390 ◽  
pp. 4865-4870
Author(s):  
You Hua Gao ◽  
Guo Wei Liu ◽  
Xiao Ming Liu ◽  
Zeng Feng Lai
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
High Voltage ◽  
Influence Factors ◽  
Calculation Model ◽  
Distribution Characteristics ◽  
Electrical Field ◽  
Dc Voltage ◽  
Voltage Polarity ◽  
Maximum Electric Field

The numerical calculation model with compound insulation of transient electrical field is established. The types of voltage applied on the valve side winding of the converter transformer are complicated and the insulation is more prominent. So the simplied calculation model of the valve side winding of the converter transformer is established. The distribution characteristics of electrical field of the valve side winding of the converter transformer is analyzed and electric field in different electrical conductivity and permittivity are calculated under AC high voltage, DC high voltage, AC superimposed DC voltage, polarity reversal voltage. Under all kinds of high voltages, the maximum electric field strength is calculated and analyzed. Some important influence factors for electrical field distribution are also discussed in this paper.

Study on Electric Field Characteristics of Converter Transformer on Valve Side Winding

2011 ◽  
Vol 130-134 ◽  
pp. 1413-1417
Author(s):  
You Hua Gao ◽  
Guo Wei Liu ◽  
Yan Bin Li ◽  
You Feng Gao
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Fields ◽  
High Voltage ◽  
Electric Field Distribution ◽  
Influence Factors ◽  
Calculation Model ◽  
Dc Voltage ◽  
Voltage Polarity ◽  
Transient Electric Field

Numerical calculation model with compound insulation of transient electric field is given. The insulation is more prominent due to complication for voltage applied on valve side winding of the converter transformer. So the simplied structure for electric calculation on the valve side winding of the converter transformer is established. The electric field distribution characteristics on the valve side winding of the converter transformer is analyzed and electric fields in different resistivity and permittivity are calculated under AC high voltage, DC high voltage, AC superimposed DC voltage, polarity reversal voltage. The maximum electric field intensity is calculated and analyzed under kinds of high voltage. Some important influence factors for electric field distribution are also discussed in this paper.

scholarly journals Analysis of Electric Field and Current Density for Different Electrode Configuration of XLPE Insulation

2018 ◽  
Vol 7 (3.36) ◽  
pp. 127 ◽  
Author(s):  
Nishanthi Sunthrasakaran ◽  
Nor Akmal Mohd Jamail ◽  
Qamarul Ezani Kamarudin ◽  
Sujeetha Gunabalan
Keyword(s):  
Electric Field ◽  
Power System ◽  
Field Distribution ◽  
High Voltage ◽  
Current Density ◽  
Electric Field Distribution ◽  
Electrical Power ◽  
High Electric Field ◽  
Electrode Configuration ◽  
Maximum Electric Field

The most important aspect influencing the circumstance and characteristics of electrical discharges is the distribution of electric field in the gap of electrodes. The study of discharge performance requires details on the variation of maximum electric field around the electrode. In electrical power system, the insulation of high voltage power system usually subjected with high electric field. The high electric field causes the degradation performance of insulation and electrical breakdown start to occur. Generally, the standard sphere gaps widely used for protective device in electrical power equipment. This project is study about the electric field distribution and current density for different electrode configuration with XLPE barrier. Hence, the different electrode configuration influences the electric field distribution. This project mainly involves the simulation in order to evaluate the maximum electric field for different electrode configuration. Finite Element Method (FEM) software has been used in this project to perform the simulation. This project also discusses the breakdown characteristics of the XLPE. The accurate evaluation of electric field distribution and maximum electric field is an essential for the determination of discharge behavior of high voltage apparatus and components. The degree of uniformity is very low for pointed rod-plane when compared to other two electrode configurations. The non- uniform electric distribution creates electrical stress within the surface of dielectric barrier. As a conclusion, when the gap distance between the electrodes increase the electric field decrease.  

scholarly journals Development of Calculation Model for Metallic Particle Motion Considering Discharge Phenomenon under High Voltage Electric Field in SF6 Gas

2006 ◽  
Vol 126 (1) ◽  
pp. 73-79
Author(s):  
Toshiaki Rokunohe ◽  
Tomohiro Moriyama ◽  
Yoshitaka Yagihashi ◽  
Makoto Koizumi ◽  
Fumihiro Endo
Keyword(s):  
Electric Field ◽  
High Voltage ◽  
Particle Motion ◽  
Calculation Model ◽  
Metallic Particle

scholarly journals EFFECT OF ALUMINUM FOILS NUMBER AND ITS LENGTH IN IMPROVEMENT OF ELECTRIC FIELD DISTRIBUTION OF HIGH VOLTAGE CONDENSER BUSHING

2021 ◽  
Vol 25 (4) ◽  
pp. 67-83
Author(s):  
Zahraa G. Mustafa ◽  
◽  
Kassim R. Hameed ◽  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
High Voltage ◽  
Ansys Software ◽  
Electrical Field ◽  
Stress Control ◽  
Electrical Stress ◽  
Maximum Value ◽  
Contour Plots ◽  
High Voltage System

High voltage condenser bushing is one of the important component that is widely used in the high voltage system. At high voltage levels more than 52kV the distribution of electric field in condenser bushing is irregular between the lead conductor and the grounded metallic flange. This paper studied the effects of changing in both: the number layers of aluminum foils and Oil impregnated Paper (OIP), increasing the length of aluminum foils layers, and also increasing the thickness of OIP layer on the distribution of electric potential and electric field in condenser bushing by using Finite Element Method (FEM) and built the bushing model in ANSYS software. The harmonic analysis was performed of the bushing model at maximum value of withstand voltage test at 50Hz, from the analysis results are obtained the maximum value of electric field on the inner and outer surface of the bushing, the obtained electric field values were good and acceptable compared to the permissible electrical stress values of the dielectric insulators. This work can also aid in the design of high voltage bushing stress control, a knowledge of the electrical field distribution in bushing geometry. Moreover the results of analysis are shown as contour plots, graphs plotted, and tables.

Enhanced electrical conductivity of polyaniline films by postsynthetic DC high-voltage electrical field treatment

2013 ◽  
Vol 179 ◽  
pp. 116-121
Author(s):  
Lenka Kulhánková ◽  
Jonáš Tokarský ◽  
Lubomír Ivánek ◽  
Veleslav Mach ◽  
Pavlína Peikertová ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Voltage ◽  
Electrical Field ◽  
Polyaniline Films

scholarly journals Effect of high voltage electric field on structure and property of PEDOT : PSS film

2017 ◽  
Vol 51 (12) ◽  
pp. 1669
Author(s):  
Jinling Zhang ◽  
Juncheng Liu
Keyword(s):  
Electrical Conductivity ◽  
Electric Field ◽  
Visible Light ◽  
High Voltage ◽  
Chemical Structure ◽  
Quartz Substrate ◽  
Light Transmittance ◽  
Structure And Property ◽  
Hall Effects ◽  
Fourier Transform Raman Spectroscopy

Low electrical conductivity of PEDOT : PSS film is to some extent a limit for its wide application. To solve this problem, the high voltage electric field was used to improve the film's electrical conductivity and its effects on the film's structure and properties were investigated. The PEDOT : PSS film was prepared on quartz substrate with spin coating. Visible light transmittance of the prepared film was tested with UV-Visible spectroscopy and chemical structure was measured with Fourier transform Raman spectroscopy (FTRM). The surface morphology was characterized with AFM, and electrical conductivity was measured with Hall effects measurement. The results showed that with the increase of the electric field, the electrical conductivity of PEDOT : PSS film was boosted rapidly at first, and then improved slowly when the electric field was above 200 kV/m. The film's electrical conductivity improved more than 17 times in total from 0.51·10-3 up to 8.92·10-3 S/m. However, the film's visible light transmittance decreased only a little with the increase of the electric field, not more than 3%. In addition, despite little change in the chemical structure of the PEDOT : PSS film, its surface roughness increased significantly with the increase of the electric field intensity. DOI: 10.21883/FTP.2017.12.45183.8553

Activation of Molten Alkali Chloroaluminates

2014 ◽  
Vol 1033-1034 ◽  
pp. 477-480
Author(s):  
O.M. Shabanov ◽  
L.A. Kazieva ◽  
Sagim I. Suleymanov
Keyword(s):  
Electrical Conductivity ◽  
Relaxation Time ◽  
Field Strength ◽  
High Voltage ◽  
Electrical Field ◽  
Electrical Field Strength ◽  
Molten Sodium ◽  
Limiting Values ◽  
Sodium And Potassium ◽  
Wien Effect

The electrical conductivity of molten sodium and potassium chloroaluminumates increase with increasing electrical field strength and reach the limiting values. The limiting high-voltage conductivities of the melts surpass their usual values up to 200% in NaAlCl4and 700% in KAlCl4. These results have been obtained on the base of analysis of the microsecond high-voltage discharges in the melts (the Wien effect). After the high-voltage pulses discharges having been completed in the melts, their conductivity has been found to rise up to 50% (the “memory effect”). The relaxation time of a non-equilibrium state reaches 5 minutes and more.

scholarly journals Finite Element Analysis of Maximum Electric Field for Air Breakdown under Various Electrode Configurations

2018 ◽  
Vol 10 (2) ◽  
pp. 416
Author(s):  
Nur Farhani Ambo ◽  
Hidayat Zainuddin ◽  
Muhammad Saufi Kamarudin ◽  
Jamaludin Mohd Wari ◽  
Ayuamira Zahari
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Comsol Multiphysics ◽  
Electrical Field ◽  
Element Analysis ◽  
Maximum Electric Field ◽  
Simulation Results ◽  
Air Breakdown ◽  
Very High

<p>This paper describes the electric field behavior of air breakdown under various electrode configurations and gap length. By using COMSOL Multiphysics, a Finite Element Method (FEM) software, the values of maximum electric field can be determined based on the air breakdown voltage data obtained from the experiment under AC stress. The results show that R0.5-plane configuration provides a very high electric field upon breakdown, compared to R6-plane, R48-plane and plane-plane configurations. In addition, the comparison between the analytical and simulation results of maximum electrical field gives almost identical results for each electrode configuration except for R6-plane.</p>

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