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This paper presents an electro-thermal hydrodynamic model that explains the development of different streamer modes in transformer oil. The focus is on the difference between the slow 2nd and fast 3rd mode streamers discussed in the literature. Through the use of numerical methods the model demonstrates that streamer modes arise in transformer oil due to the electric field dependent molecular ionization...
Transformer oil-based nanofluids with conductive nanoparticle suspensions have been experimentally shown to have substantially higher positive voltage breakdown levels with slower positive streamer velocities than that of pure transformer oil. A comprehensive electrodynamic analysis of the processes which take place in electrically stressed transformer oil-based nanofluids has been developed and a...
An electro-thermal model is presented of streamer initiation and transport that leads to electrical breakdown. The dominant charge initiation mechanism treated is electric field dependent molecular ionization. Analysis using COMSOL Multiphysics shows that molecular ionization results in fast electrons that cause a propagating electric field wave that is the dominant mechanism in the initiation of...
This paper provides an overview of the classic moisture equilibrium curves and their history and provides useful information on the relationships among them and their validity.
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