A5031477156- High voltage insulation and dielectric phenomena
- Power Transformer Diagnostics and Insulation
- Aerosol Filtration and Electrostatic Precipitation
- Lightning and Electromagnetic Phenomena
- Vacuum and Plasma Arcs
- Advanced Wireless Network Optimization
- Energetic Materials and Combustion
- Cooperative Communication and Network Coding
- Combustion and Detonation Processes
- Geographic Information Systems Studies
- Remote Sensing and Land Use
- Advanced Neural Network Applications
- Mobile Ad Hoc Networks
- Electrical and Bioimpedance Tomography
- Diamond and Carbon-based Materials Research
- Non-Destructive Testing Techniques
North China Electric Power University
2018-2024
The metal particle contamination in gas-insulated switchgear (GIS) or transmission line (GIL) is an important factor leading to the decline of insulation performance. Exploring deterioration mechanism and suppression measures particles on a key technical problem enhancing dielectric strength GIS/GIL equipment. In this paper, charge motion characteristics are firstly introduced. gas gap breakdown caused by free surface flashover near adsorbed insulator then analyzed according different...
The ReaxFFSFO force field for a SF6-O2 system is developed based on the density functional theory (DFT) calculation data. Then, series of molecular dynamics (MD) simulations were performed. results show that main oxygen-containing compounds appeared in MD simulation include SOF4, SOF2, and SO2F2. relative quantitative relationship between SOF2 SOF4 can be used to determine fault temperature. Besides, under overheating conditions, O2 rarely undergoes self-cracking process generate free O...
Gas-insulated equipment such as GIS (Gas-Insulated Substation) and GIL transmission lines) faces critical insulation failure challenges caused by particles inside. However, the particle traps, key devices available to inhibit movement of particles, lack theoretical basis quantitative methodology for trap design especially with high voltage ratings. In this paper, a motion excitation observation platform is established physically simulate actual online operating conditions HVAC/HVDC GIS/GIL...
When DC GIL in operation endures the lightning impulse voltage, charge accumulation at gas-solid interface area will seriously affect insulation performance of spacer. Considering that gas side conduction is one important factors affecting accumulation, for purpose clarifying characteristics gaseous medium flashover process interface, an experimental platform simulating working conditions spacer built. The tests were carried out with and without aluminum particle SF <sub...
The analysis of the influence different dielectric gases on flashover characteristics insulators under DC voltage superimposed impulse is mainly performed in this paper. In experiment, spacer surface charge saturated by applying working temperature advance. experiments were conducted with and without linear metal particle pure SF <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> , C xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> F...
Metal dust of micron level is often generated in DC GIS/GIL, probably causing serious faults such as surface flashover insulators. In this paper, a semi-closed coaxial cylindrical electrodes platform was built to study the movement behavior and adsorption mechanism metal near basin-type insulator, unique phenomena were obtained. Firstly, two modes discovered. One "accumulative adsorption" on other "diffusive towards high-voltage electrode grounded electrode. Then, some special observed. For...
Insulation failure usually occurs in AC gas-insulated transmission (AC GIL) field operation, which the primary cause is charged motion of metal particles electric filed. At present, particle inhibition method applied to design traps on inner wall GIL shell. However, due large randomness for metallic and limitations test methods, a trap has not yet been designed from perspective trapping effectiveness. In this paper, firstly, referring size running 252 kV GIL, 1:1 scaled 3-D similarity...
Abstract The Wire metal particles in gas-insulated equipment such as GIS (Gas-Insulated Substation) and GIL transmission lines) under DC stress present a special firefly motion behaviour, namely long-term levitation on the surface of conductors. However, electrode coating, key device available to suppress movement particles, lacks theoretical basis well an effective selecting criterion wire particle’s firefly. In this paper, test platform is established obtain charge dynamics ionic wind...
Particle trap is an important measure to restrain the damage of moving metal particles insulation DC gas insulated transmission lines (GIL). However, there still no clear guiding principle for design particle in GIL, and little theoretical research on trap. In this paper, a design, wedge-shaped trap, proposed. Compared with traditional results show that can shield electric field at bottom more efficiently effectively, block spherical escape. Furtherly, traps are optimized based capture...
Free metal particle within DC gas insulated line (GIL) imposes great threat on insulation system by distorting the electric field and inducing partial discharge in or insulator surface. To investigate severity of free influencing factors, a coaxial cylindrical electrode filled with SF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> different pressures is established, which line-shape particles lengths are set, signal measured pulse...
Particle trap as a mean to suppress the movement of particles by constructing local low field regions, is common particle suppression measure in gas insulation systems. In this paper, researches on DC metal traps have been carried out. A 110 kV insulated line(GIL) experimental platform has set up and corresponding 3D simulation model constructed. The trapping performance different widths thicknesses studied through simulations experiments. results show that probability increases peak with...
Sulphur hexafluoride (SF6) is the most commonly used dielectric gas in electrical systems, DC-GIL considered as a new type of transmission lines has potential to replace overhead and cables future for use DC distribution networks. It deserves great concern that abundant amount SF6 earth's atmosphere because this known be kind "greenhouse gas". Also, metal particles inevitably appearing pipeline GIL which may do damage cause serious threat its insulation safe reliable operation. This paper...
Over the recent past, use of Sulfur hexafluoride (SF6) has been a dominant efficient dielectric because its excellent arch quenching measure, and inflammability. However, there have great worries due to greenhouse effects SF6. With purity being major point concern, mixture low SF6 gas with nitrogen (N2) which is less harmful strike key milestone in obtain compromise between environment protection campaign as well need power systems. Need knowledge breakdown voltage values breaking voltages...