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The design constraints of gas insulated switchgear(GIS) are changing due to an increasing power demand and decreasing available floor space for substations. Ideally, new GIS should operate at a higher nominal voltage with a minimal or no increase in size. Another ongoing development in the power industry is the desire to replace SF6 by an environmentally friendly gas which is preferably readily available...
In gas insulated switchgear(GIS) SF6 gas is widely in use because it has good electrical insulation and arc interruption capabilities. Due to environmental constraints the desire to use alternative gases is continuously growing. This paper focuses on dry air as an alternative gas which unfortunately has a breakdown strength which is lower than the breakdown strength of SF6 at equal gas pressure. To...
Polymeric insulation materials have not been used in HVDC cable systems until recently because of the tendency of polymers to deplete accumulated charges very slowly. Research on space charge injection, conduction and trapping mechanisms can reveal information about which materials are the best candidates for HVDC cable insulation. In this paper, space charge de-trapping and extraction processes are...
Polymeric cables operating under high voltage direct current (HVDC), suffer from space charge accumulation and may exhibit a relatively low depletion rate of accumulated charges when the external field is removed. Increasing the reliability of polymeric dc cables is of crucial importance. The development of new polymeric materials with improved performance under dc electrical stresses requires a thorough...
Electric power consumption has increased over the years while the available space for substations has become smaller. Newly designed gas insulated switchgears(GIS) have to be smaller and have to operate at a higher system voltage. Furthermore, the urge to decrease the use of SF6 as an insulating gas in GIS is becoming larger because of the high production and handling costs and the high global warming...
Polymeric insulation materials have not been used in HVDC cable systems until recently because of the tendency of polymers to deplete accumulated charges very slowly. Research on space charge injection, conduction and trapping mechanisms can reveal information about which new materials are the best candidates for HVDC cable insulation. In this paper, the space charge accumulation processes are evaluated...
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