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Fluoronitriles/ CO2 gas mixture as promising substitute to SF6 for insulation in high voltage applications
This paper is aimed at the breakdown characteristics of Fluoronitriles – CO2 gas mixtures in different experimental conditions; these mixtures constitute promising substitutes to SF6 gas in high voltage applications especially gas insulating switchgear (GIS).
The rise of variable speed Pump Storage Plant (PSP)
Pumped Storage Plants (PSP) are the most reliable and well-known energy storage technology for high power applications. The needs of the future power network including DC transmission and intermittent power sources demand for fast responses from those storage plants. In order to face this new environment, the Variable Speed PSP (VarSpeed PSP) allows a faster response to the power grid.
The rise of variable speed Pump Storage Plant (PSP)
Pumped Storage Plants (PSP) are the most reliable and well-known energy storage technology for high power applications. The needs of the future power network including DC transmission and intermittent power sources demand for fast responses from those storage plants. In order to face this new environment, the Variable Speed PSP (VarSpeed PSP) allows a faster response to the power grid.
Leakage Current Measurements in Direct Current Gas Insulated Substations Equipment
Charge accumulation on solid insulator in Gas Insulated Substation (GIS) is one of the major issues under Direct Current (DC). A specific device has been developed in order to assess the origin of such charges within SF6, in a coaxial geometry.
DC-DC Converters for HVDC Grids: A Survey
The recent interest in renewable energies has encouraged the research on a new concept of electrical grid - the Supergrid based on HVDC meshed grids. To be implemented, this new system requires the development of new technologies. One key-enabling technology is the high power DC-DC converter, a topic that is increasingly gaining more attention from both academia and industry.
A Preliminary Loss Comparison of Solid-State Transformers in a Rail Application Employing Silicon Carbide (SiC) MOSFET Switches
The silicon carbide (SiC) power semiconductor and the medium frequency transformer (MFT) are two enabling technologies that are allowing the efficiencies and power densities of power electronic converters to be pushed beyond the limits of those that have previously been possible...
Barrier effect on Surface Breakdown of Epoxy Solid Dielectric in SF6 with Various Pressures
This paper is aimed at the experimental study of creeping discharges and flashover of cylindrical epoxy solid insulators with and without barrier.
Time constant evaluation of transient AC – DC field distribution
HVDC (High Voltage Direct Current) technology is particularly suitable for the transmission of high-power energy over long distances. However, some technical/technological problems have to be addressed/managed when passing from HVAC to HVDC due among others to the fact that the electric field distribution in gas insulated systems (GIS) operating under DC stress is very different from AC conditions.
Surface Flashover of Solid Insulator in Air
This paper is aimed at the propagation of discharges over a surface of insulator and the development of an analytical flashover model in air at atmospheric pressure. The experimental results show that the critical conditions of flashover are over the half of creeping distance.
Simulation methodology for DC GIS
Dimensionning of DC isulation is relatively complexe and need to take into account must more effects and parameters than in AC. This paper presents simulation methodology to applied for DC GIS and GIL.
