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Gas Insulated Substation (GIS) under High Voltage Direct Current (HVDC) are becoming widely investigated with the development of DC networks. Under DC voltage, mechanism of charge accumulation on the insulation surface is of major importance since it may distort the electric field distribution. The latter directly depends on material's conduction and so, on its volume and surface conductivities. Previous...
Measurements of “dark currents” in pressurized SF6 in high uniform electric field are carried out. To identify the mechanism involved, the influences of electric field, gas pressure and relative humidity are investigated. The experimental results support the hypothesis of emission of charged water clusters from electrodes. A simple model describing the above mechanism is developed, which allows accounting...
Surface resistivity of solid insulators is usually determined by measuring the current induced when an electric field tangential to the surface is applied. This classical method can become questionable when the electric field is raised. In fact, a current may also flow above the interface through the humid gas, in addition to currents flowing at the interface and below the interface within the solid...
Current measurements in pressurized gases at high electric field are performed using electrodes with coaxial geometry. To identify the main mechanisms involved in “dark current” measured, the influences of electrode roughness, gas pressure, relative humidity and temperature have been investigated. The experimental results reveal that charge injection from the electrode constitute the main mechanism...
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