There is an increasing interest in the study of direct plasma generated in liquid/ bioliquid as it fi nds more applications in both industry and academic research. For all the applications, it is important to get a better understanding of the key physical mechanisms of the breakdown process. In the present paper, streamer propagation during an electric breakdown process of dielectric liquid was...

In order to prevent global warming, the emissions of greenhouse gases must be reduced. In public transportation systems, electric buses can help to achieve this. However, the deployment of electric buses has been limited to public corporations as a result of the weight of the required energy storage devices. One approach to addressing this problem is rapidly charging the electric bus at every b...

In South Africa, the growing power demand, challenges of having idle infrastructure, and delivery issues have become crucial problems. Reliability enhancement necessitates a life-cycle performance analysis electrical transformers. To attain reliable operation continuous electric supply, methodical condition monitoring transformer is compulsory. Abrupt breakdown instigates grievous economic detr...

Experiments have been performed with a 100-kJ pulse-forming network (PFN) to characterize the transient behavior of semiconductor diodes serving as capacitor-protecting devices. In addition to the experiments, computer techniques are used to illustrate and predict the dynamic behavior ofPFN diodes. From analyses of the data collected, it was determined that in a PFN under specific loading condi...

We present results for hydrodynamic simulations of pseudomorphic AlGaAs/InGaAs/GaAs High Electron Mobility Transistors (HEMTs) obtained by the two-dimensional device simulator MINIMOS-NT. The concise analysis of industrially relevant HEMT power devices of two different foundries for gate-lengths between lg = 140 nm and lg = 300 nm is carried out. Several aspects, including thermal and breakdown...

This paper presents results of experimental investigations on natural esters dielectric and coolant fluids regarding the breakdown strength. The breakdown voltage (BDV) for small and medium oil gaps (from 2 mm up to 40 mm) under AC and lightning impulse (LI), uniform and non-uniform electrical field is measured. Experiments involve new, aged and with mineral oil contaminated natural esters. The...