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The influence of a solid dielectric barrier on development of an electrical discharge in air between needle and plane electrodes is analyzed by means of computer simulations. The computational model describing formation and propagation of a streamer in atmospheric air and accounting for charge transport and trapping on barrier surfaces is presented. The results of the simulations performed for 5 cm...
Fully coupled self-consistent model of streamer branching is presented. The model incorporates inhomogeneities in gas media representing, e.g., large molecular clusters, micro dust particles, etc., which act as centers for localized space charge build-up. The results of the performed simulations show that charge accumulation at such centers leads to their electrostatic interactions with the streamer...
In this paper we show some of the considerations for thermal design of medium voltage gas insulated switchgears (MV GIS), with reference to one of our late products. There, a consistent design was targeted, which covered ratings up to 2500 A. It is interesting to note, that before any drawing was created, the thermal concept of the new switchgear was at the heart of the very first steps of the design...
This publication presents an innovative solution proposal for the utilization of local intelligence for circuit-breakers. The concept considers the increasing technical constraints for the targeted wide integration of decentralised and renewable energy sources in the future grids. It covers the demand for a meshed distribution networks caused by volatile local generation of energy and the non-synchronized...
This paper presents our experiences of using thermal network analysis in the design and development of medium voltage switchgears. A thermal network model is created for a four-panel temperature rise test. The simulation result is compared to the measurement. Taking a GIS with a rated current of 2500A, a single phase simulation is done within a few seconds with a deviation as low as 2 Kelvin.
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