Influence of thermal treatment on space charge in alumina-filled epoxy resin for HVDC GIS
A Gas Insulated Substation (GIS) consists of a high-voltage conductor maintained by spacers placed in a metal enclosure filled with a dielectric gas.
Recommendations for surface conductivity characterisation under high voltage direct current (HVDC)
Phenomena of charge accumulation on the insulator surface are of major interest in Gas Insulated Substations (GIS) under Direct Current (DC)...
FastGrid : Cost effective FCL using advanced superconducting tapes for future HVDC grids
FastGrid is a project funding for an amount of 7.2 M€ by the European Union’s Horizon 2020. It started in January 2017 for a period of 42 months. Together 9 academic and 3 industrial partners participate to the development of a superconductive fault current limiter associated with a DC breaker will fulfil the requirement of one the protection strategies of the future HVDC networks. The project is divided in 4 technical main packages.
Space charge measurements on cable dielectrics
When a voltage is applied to a cable, electric charges are established in its electrodes, inducing an electric field in the dielectric. This electric field implies that the cable is submitted to an electrical stress which, under certain circumstances induces an accelerated ageing of its dielectric which may be followed by its breakdown.
PhD Houssem Eddine NECHMI “Research of gas/ gas mixture without sulfur hexafluoride for High Voltage Insulation applications”
SULPHUR hexafluoride, SF6, is the most common compressed gas used in high voltage power equipment since the 1950s and in HV transmissions and substations applications (GIS, GCB, GIL …), SF6 holds a prominent place because of its dielectric and chemical performance (high dielectric strength, non-toxicity, low condensation temperature, thermal stability, non-flammability, chemical inactivity with the other constituent materials of the apparatus, availability and moderate cost). It is one of the best insulators gas known today.
Surface charge measurement on epoxy spacer in HVDC GIS/GIL in SF6
The design of reliable high voltage equipment remains a challenge nowadays. The surface charge accumulation at gas/solid interface is a major problem of HVDC GIS/GIL. The electric field can be distorted and the dielectric strength of the system can be thus reduced dramatically due to surface charges.
Development of a Space Charge Measurement Method Applied to HVDC GIS Spacers
The development of HVDC networks leads to an increasing need of Gas Insulating Substations (HVDC-GIS). When an insulator is subjected to high thermoelectric dc DC stress, space charge accumulation can induce local increases of the electric field, which must be known and taken into account for the equipment design when the fields exceed several kV/mm.
Creeping Discharge and Flashover of Solid Dielectric in Air at Atmospheric Pressure
This paper is aimed at the study of the propagation of discharge at the surface of solid insulator and the development of an analytical model of flashover in air.
CEIDP 2016 Toronto – Fluoronitriles / CO2
This paper is aimed at the comparison of breakdown voltages of SF6 and mixtures at different concentrations of Fluoronitriles in CO2. The experiments are conducted in different electrodes geometries under DC and lightning impulse voltages.
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).
