A5015945655- High voltage insulation and dielectric phenomena
- Vacuum and Plasma Arcs
- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Plasma Diagnostics and Applications
- Electrical Fault Detection and Protection
- Atomic and Molecular Physics
- Combustion and Detonation Processes
- Risk and Safety Analysis
- Semiconductor materials and devices
- Multilevel Inverters and Converters
- Engineering Applied Research
- Electrostatic Discharge in Electronics
- Thermal Analysis in Power Transmission
- Silicon Carbide Semiconductor Technologies
- Engineering and Test Systems
- Electrical Contact Performance and Analysis
- Advanced Chemical Physics Studies
- Power Transformer Diagnostics and Insulation
Korea Electrotechnology Research Institute
2015-2024
In this paper, the analysis is performed on Thomson coil actuator and dynamic characteristics presented, which necessary to fast switch of HVDC circuit breaker. For analysis, electromagnetic equations are simultaneously solved using commercial code. Whole geometry with a drive simplified applied by considering cylindrical shape for simulation. calculation current flowing through as component electric power operation actuator, resistance inductance taken into account, including stray...
In the study, an interrupting performance test on 145 kV gas circuit breaker is performed according to three different gases: SF6, g3 (5% NovecTM4710 with 95% CO2), and CO2(70%)/O2(30%) gases. Thanks research advancements, it confirmed that CO2 NovecTM 4710) gases, respectively, have 40% 75% dielectric strength, compared of SF6 gas. The filling pressure transient recovery voltage criteria each were determined differently in order compare maximum was be 5.5 bar, which typically used breakers....
Quantum chemistry calculation on perfluoro-methyl-vinyl-ether with chemical formula C3F6O (CF2CFOCF3) is performed. The main aim to explore this new gas in various scientific and industrial fields, especially plasma applications. obtained vertical ionisation energy electron affinity are 10.336 eV −1.377 respectively. corresponding adiabatic values 9.339 0.242 eV. Thus, the attachment property of PMVE good process will be slowed down insulation medium. band gap 11.19 which shows stability...
In the HVDC grid hybrid circuit breakers are adopting stack of solid state SW (S/S) has capability to break fault current. The S/S breaker comprise several semiconductors which connected in series. importance large capacity been shaping up breaker. However, rated power semiconductor at is not enough overcome high voltage generated by blocking this reason, serial connection a number switches necessary. when serially, unbalanced could be appeared each due difference semiconductor's turn-off...
Electron impact scattering from C3F6O is studied in this work. The R-matrix method was used for the calculations of elastic, momentum transfer, and excitation cross sections. attachment section obtained through a parametric estimator based on outputs. Binary-Encounter-Bethe (BEB) computing ionization section. set transport studies using BOLSIG+ code, which two-term Boltzmann equation solver. present calculation performed steady-state Townsend experimental conditions E/N, covering range...
To examine the possibility of using a gas molecule as an SF6 alternative gas, insulation properties must be estimated. In this work, we present theoretical approach to calculate geometry parameters, electron scattering cross sections, and transport nitrogen fluoride oxide (F3NO), which have selected SF6. The molecular minimum structure F3NO was optimized ɷB97X-D functional combined with aug-cc-pVTZ basis set. Using initial obtained by calculation, R-matrix calculation done obtain elastic...
The dielectric breakdown properties of dry air, which is widely used as the insulation gas in switchgears electric distribution systems, are determined for dry-air switchgear analysis and design. In this study, a two-term Boltzmann was applied to investigate air with increasing temperatures (300–5000 K) at atmospheric pressure (0.1 MPa). According changes component ratios collision cross sections high-mole-fraction decomposition species were considered. order analyze contribution each...
The vertical ionization energy and electron affinity obtained from quantum chemical calculations for perfluoro-methyl-vinyl-ether (PMVE) with the formula CF2CFOCF3 are 10.336 eV -1.377 eV, respectively. corresponding adiabatic values 9.339 0.242 eV. Therefore, PMVE has good attachment properties slows down process in insulating media. band gap of is 11.19 demonstrating stability molecule. We further suggest degradation pathways neutral, positive negative ions PMVE, suggesting that CF3, CF3+...
In this paper, the design of a 72.5 kV CO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> mixture gas circuit breaker (CB) and results its interruption capability tests were presented. The short-line fault (SLF; L90) was tested. This study developed technique to analyze arc plasma, which then applied CB. just 20–30% that SF xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> gas. Therefore, ablation elements dual motion operation CB...
Quantum chemistry calculation on perfluoro-methyl-vinyl-ether with chemical formula C3F6O (CF2CFOCF3) is performed. The main aim to explore this new gas in various scientific and industrial fields, especially plasma applications. obtained vertical ionisation energy electron affinity are 10.336 eV -1.377 respectively. corresponding adiabatic values 9.339 0.242 eV. Thus, the attachment property of PMVE good process will be slowed down insulation medium. band gap 11.19 which shows stability...