scholarly journals Universal Mathematical Model of Leakage Currents and Currents Spread on Elements of High-Voltage Pillar

2015 ◽  
Vol 100 ◽  
pp. 1515-1521
Author(s):  
Voytkevich Sofiya ◽  
Breido Iosif ◽  
Kaverin Vladimir
Keyword(s):  
Mathematical Model ◽  
High Voltage ◽  
Leakage Currents

scholarly journals Mathematical Model of Hybrid and Electric Cars Control System

2021 ◽  
Vol 320 ◽  
pp. 01014
Author(s):  
Vladimir Kozlovsky
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Mathematical Models ◽  
High Voltage ◽  
Test Bench ◽  
Hybrid Vehicles ◽  
Storage Battery ◽  
Battery Cell ◽  
Electric Cars ◽  
High Voltage Battery

The paper presents development results of the complex of simulation mathematical models of real-time and algorithms for a semi-natural test bench of the control system of a high-voltage storage battery of hybrid vehicles. They are designed to control the physical model of the test bench, simulating the characteristics of the cells of the high-voltage storage battery and other components that make up the high-voltage storage battery. This study aims to implement a complex of mathematical models and software with the required accuracy of parameters and signals that simulate the behavior of a real high-voltage battery. That intended for the development and testing of mathematical algorithms and software for the control system of a high-voltage battery of a hybrid vehicle. The main features of the developed models are an imitation of the characteristics of the cells of a high-voltage storage battery with the ability to set the initial state-of-charge (SOC) and change the charge during the operation of the model. The data were used to develop and evaluate a mathematical model of a high-voltage storage battery cell. The operating result contributes to the acceleration of the software development process for electrical complexes and control systems for high-voltage batteries for hybrid vehicles.

scholarly journals Simulation of the insulation monitoring system of the high-voltage electrical network of a vehicle with a hybrid power plant

2021 ◽  
Vol 1 (2) ◽  
pp. 36-50
Author(s):  
A.N. Malyshev ◽  
◽  
YE.A. Grunenkov ◽  
V V. Debelov ◽  
M.D. Mizin ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Monitoring System ◽  
High Voltage ◽  
Simulation Modeling ◽  
Physical Simulation ◽  
Electrical Network ◽  
Insulation Resistance ◽  
Insulation Monitoring ◽  
High Voltage Battery

The paper presents the results of mathematical and simulation modeling, as well as calculated and experimental dependencies, which make it possible to evaluate the operation of the insulation resistance monitoring system of the high-voltage power grid of a hybrid vehicle. The work also provides circuits for measuring insulation resistance, a mathematical model in the MATLAB Sim-ulink environment, and the peculiarities of the operation of the software and hardware simulation complex. The aim of the work is to obtain the most reliable mathematical and physical model of insulation resistance, to determine the architecture of a high voltage battery with the IRM system included in it, to identify the key functions and characteristics of the IRM system, to test the simulation system. The introduction justifies the importance of the IRM system and provides references to standards that govern the requirements for measuring and identifying utility faults. The block diagram of the high voltage battery control system is presented. The composition of its main elements is described. The functions and key characteristics of the IRM system are considered, typical characteristics of insulation monitoring systems are given. A schematic diagram of determining the insulation resistance of conductors and an electric circuit is clearly considered. An equivalent circuit of a differential DC amplifier with a unipolar power supply is presented, which is used to amplify small differential voltages on a shunt when changing large common-mode voltages, which is part of the measuring circuit. Mathematical and simulation modeling was carried out to evaluate the method for calculating the insulation resistance according to the well-known scheme, which is used when measuring using the three-voltmeter method. There was considered the mode of checking the the insulation control system, when several test procedures performed containing simulation of the fault and operating condition of the insulation by connecting and measuring the test resistance. The results of physical simulation of the IRM system and measurement of insulation resistance, voltage between each of the high voltage supply wires and the high voltage battery case, voltage between the wires, battery voltage were obtained. The actual insulation resistance was calculated. The conclusions explain the effectiveness of physical and simulation modeling, obtaining a reliable mathematical model and low error in modeling the insulation characteristics.

Investigation of the throughput of the dosing device gas leak for gas discharge electron gun

2012 ◽  
Vol 16 (5) ◽  
pp. 25-30
Author(s):  
I.V. Mel'nik ◽  
S.B. Tugaj
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Glow Discharge ◽  
High Voltage ◽  
Beam Current ◽  
Electron Gun ◽  
Technological Equipment ◽  
Gas Leak ◽  
Electron Guns ◽  
Empirical Coefficients

Model of capacity of valve with conic rod, which is used for control of beam current of high voltage glow discharge electron guns, is considered. Because of complicity of valve details geometry, mathematical model of dozed item is improved by suitable choosing of empirical coefficients and its approximation. On the base of modeling and experimental data analyzing of dependence of valve exploitation characteristics from geometry parameters of dozed item is provided. Obtained results can be used for simulation of stability of operation of high voltage glow discharge electron guns inconsisting of technological equipment

Temperature State of the Electrical Insulation Layer of a Superconducting DC Cable with Double-Sided Cooling

2021 ◽  
pp. 71-85
Author(s):  
V.S. Zarubin ◽  
G.N. Kuvyrkin ◽  
I.Yu. Savelyeva
Keyword(s):  
Mathematical Model ◽  
Electrical Resistivity ◽  
Liquid Nitrogen ◽  
High Voltage ◽  
Electrical Insulation ◽  
Insulation Layer ◽  
Electrical Potentials ◽  
Annular Channels ◽  
Temperature State ◽  
Integral Relations

For the reliable operation of a high-voltage DC cable with high-temperature superconducting current-carrying conductors with a sufficiently high difference in electrical potentials, it is necessary to maintain a fixed temperature state not only of the conductors but also of other cable elements, including the electrical insulation layer. In this layer, despite the high electrical resistivity of its material, which can be polymer dielectrics, Joule heat is released. The purpose of this study was to build a mathematical model that describes the temperature state of an electrical insulation layer made in the form of a long hollow circular cylinder, on the surfaces of which a constant potential difference of the electric field is set. Within the study, we consider an alternative design of a cable with central and external annular channels for cooling liquid nitrogen. Using a mathematical model, we obtained integral relations that connect the parameters of the temperature state of this layer, the conditions of heat transfer on its surfaces, and the temperature-dependent coefficient of thermal conductivity and electrical resistivity of an electrical insulating material with a given difference in electrical potentials. A quantitative analysis of integral relations is carried out as applied to the layer of electrical insulation of the superconducting cable. The results of the analysis make it possible to assess the possibilities of using specific electrical insulating materials in cooled high-voltage DC cables under design, including superconducting cables cooled with liquid nitrogen

Fabrication of 3.4kV high voltage n-type 4H-SiC Schottky barrier diodes using thick epitaxial layers

2000 ◽  
Vol 640 ◽  
Author(s):  
Takashi Tsuji ◽  
Hiroyuki Fujisawa ◽  
Shinji Ogino ◽  
Hidekazu Tsuchida ◽  
Isaho Kamata ◽  
...  
Keyword(s):  
Schottky Barrier ◽  
High Voltage ◽  
High Yield ◽  
Epitaxial Layers ◽  
Schottky Barrier Diodes ◽  
Leakage Currents ◽  
Bright Spots ◽  
Blocking Voltage ◽  
Voltage Region ◽  
The Ideal

ABSTRACTFabrication and evaluation of high voltage n-type 4H-SiC Schottky barrier diodes (SBDs) using 27μm thick epitaxial layers were presented. To achieve the ideal value of the breakdown voltage, various parameters of junction termination extension (JTE) were investigated. We concluded that the termination of triple rings with the concentrations of 6×1017, 3×1017, 1.5×1017cm−1 outwardly was best with the simulations. The SBDs with this termination showed the blocking voltage up to 3.4kV, which is almost the ideal value. We also investigated the distribution of leakage currents at -600V in SBDs with various diameters up to 4mm. High yield was obtained in the SBDs with the diameters below 2mm. The SBDs with high leakage currents showed the excess currents in the low forward voltage region and lots of bright spots could be observed by optical beam induced current analysis.

Sign in / Sign up

Export Citation Format

Share Document