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This paper presents a dielectric simulation approach for predicting withstand voltage of air insulated power devices. The paper gives an overview of typical evaluation procedures for the basic discharge stages including inception, streamer propagation and leader transition. For selected test arrangements, we compare the results of lightning impulse tests with simulations. The simulations utilize a...
This paper reports an experimental study of the deformation of water drops on both conducting and dielectric solid surfaces under ac voltage stress. The discharge activities between water drops and between a conducting water drop and a small rod electrode on a flat hydrophobic insulator are investigated. It's shown that the electric field applied to the drop surface is controlled by the electrode...
This paper focuses on simulation based dielectric design rules of air insulated medium voltage power equipment. After a brief overview on the classical dielectric designing procedure, we propose possible new concepts and present first experimental results on streamer inception and propagation affected by dielectric surfaces. For evaluation of the inception voltage we achieved a good experimental agreement...
A novel electrowetting on dielectric (EWOD) digital microfluidic device using the high dielectric constant material P(VDF-TrFE) (poly-vinylidene fluoride-trifluoroethylene) as the dielectric layer fabricated by spin-coating process is proposed. The device is featured with the advantages of both IC compatible process and low driving voltage. The contact angle between the liquid droplet and surface...
High voltage applied to insulators in vacuum can result in a positive surface charge remaining after the voltage is removed. This is believed to be caused by an electron avalanche, i.e., a cascade of electrons multiplying on the surface by secondary electron emission, resulting in remnant positive charge on the insulator surface. The source of the primary electrons initiating the avalanche is considered...
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