No abstract

New insulation gases as alternatives to SF6 have been presented in the last years [2,3,4,5]. The main focus has been on technical performance and reduced global warming potential (GWP) compared to SF6 GIS. Another very important aspect for customers is the environmental impact and safety in all operational situations, as well as during leaks or even internal arc failures. This paper introduces a solution using AirPlus TM as an insulation gas mixture, with results of comparison tests to SF6 GIS and air-insulated switchgear (AIS).

No abstract

To mount electrical machines intended to work a very long time without maintenance, there are offered magnetic bearings. This article describes the physical fundamentals of calculating the magnetic flux density and the forces in magnetic bearings, in consideration of radial and axial displacement of the parts of the bearing, and the derived program. Subsequently the conclusions for the construction of magnetic bearings are summed up.

No abstract