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Non-pressurized air is extensively used as basic insulation medium in medium/high voltage equipments. An inherent property of air-insulated design is that the systems tend to become physically large. Application of dielectric barrier can increase the breakdown voltage and therefore decrease the size of the equipment. In this paper, the impact of dielectric barrier on breakdown voltage enhancement...
The air-polyimide surface insulating system is regard as the weak point in high frequency power transformer, since the surface breakdown strength of the dielectric is much lower than its bulk breakdown strength. However, it still remains unclear regarding the deterioration mechanism of air-polyimide surface insulating system under high frequency sinusoidal voltage. In this paper, surface discharge...
In electrochemotherapy (ECT), flexible electrodes, composed by an array of needles, are applied to human tissues to treat large surface tumors. The positioning of the needles in the tissue is randomly determined and their relative inclinations strongly affect the actual distribution of electric field. This paper analyzes the effect of inclined electrodes, also in not-uniform tissues, by means of numerical...
In a wind tunnel is simulated the effect of the corona space charge on the corona current generated in a needle under thunderstorm-like electric field conditions. The natural cloud-to-ground electric field was simulated under wind conditions. The wind tunnel was built in acrylic. Preliminary measurements have shown that the acrylic walls could affect the corona current measurements. To test the possible...
In the present work, a pulsed pin-to-plate corona reactor has been used for phenol removal from water. The main advantage of the present reactor is the presence of electrospraying of water drops at the tip of the discharge pin simultaneously with corona streamer. Electrospraying increases the treated surface area and therefore increases the efficiency of the water treatment. Also, the microdroplets...
Surface discharge on the oil-pressboard interface is considered to be serious fault condition. This phenomenon leads to the formation of a conducting path on the surface of an insulation material as a result of surface currents. The surface current is effectively the drift of charge under the action of an electric field which may be either the general electric field or a locally enhanced field developed...
This paper reports on experiments aiming at an efficient technique for contact charging of conductive microparticles. Fine electrode structures generate high electric field strengths which charge the particles in contact with the high voltage electrode. Highly charged microparticles are a prerequisite for electrostatic microparticle acceleration in laboratory experiments and advanced concepts in space...
Non contacting measurement of surface resistivity has been investigated by simultaneous applications of corona charging to a test sample and measuring surface potential around the charged spot. The corona charging electrodes are consisted of a grounded plane electrode with a circular hole and a needle electrode penetrating the plane electrode at the center of the hole, defined as phi type electrodes...
A model has been developed of the surface-recorded motor-unit action potential (MUAP) in terms of the gross anatomical properties of the motor unit. The MUAP is modeled as arising from six current sources (two tripoles). To account for the distribution of fibers and endplates, each current source is diffused throughout a volume defined by the motor unit's cross section and the length of the endplate...
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