Konferencijų medžiaga / Conference Materials: Recent submissions
Dabar rodomi įrašai 1-20 iš 3323
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Earthing effective length for low and high amplitudes of lightning impulse currents
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Earthings of the electrical power systems can achieve wide sizes. Due to equipotential bondings and a presence of main equipotential bar the earthing system can be connected even to a power transformer neutral point. ... -
Electric system and electronic device common surge impedance for surge excitation
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Impedance for lightning conditions is different in respect to static one. Fast rising surges forces impedance rise. This paper will present a surge impedance measurement results for residential devices. Measurements were ... -
Overvoltages at LAN network during high voltage surge excitation
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)This paper presents disturbances measurement results inside the computer network during surge flow in lightning protection system (LPS). Surge was produced by high voltage generator fully isolated from building supply line ... -
Analysis of errors caused by input channels amplitude discrepancies in time domain EMI measuring system
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)In this document properties of signal spectrum measured by time domain EMI multi resolution device are discussed with focus on elements of system that influence its dynamic range. Errors being analyzed are introduced by ... -
Analysis of quality from customer’s and renewable sources point of view
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)There are summarized some parameters of electric energy in this article. Their exceeding leads to complaint on quality of supplied electric energy. Further are stated some of electro-technical solutions of wind turbines ... -
Experimental study of spectrum sensing algorithm with low cost SDR
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Development of the efficient algorithm for the spectrum sensor for cognitive radio is slowed by the lack of experiments within a real environment. In this paper we suggest to use a low cost software defined radio (SDR) ... -
Voltage surges at the power supply inputs of devices protected by metal-oxide surge arresters
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)In low-voltage power installation with systems of surge protective devices no always failure-free working of equipment is assured. Estimating effectiveness of protection against overvoltages, phenomenon in simple circuit ... -
Overvoltages in low-voltage power installation with multistep system of surge protective devices
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Estimating effectiveness of protection against voltage and current surges, phenomenon in low-voltage power installations in buildings with multistep systems of surge protective devices were analyzed. Investigations’ results ... -
Complaints about power quality and reliability of electricity supply from renewable sources
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)The significant increase in energy production from renewable sources leads to the need of exploring new ways of energy systems. Evaluation of the interruption of renewable energy sources becomes very important to assess ... -
Modeling of electromagnetic radiation propagation through a system. Source of radiation – biological object – protection tool
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)The process of electromagnetic radiation propagation through a system source of electromagnetic radiation – biological object – protection tool was simulated using mathematical modeling. Antenna patterns are calculated and ... -
Study on severity evaluation methods for air discharges of ESD generator
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)To grasp the actually injected energy into the equipment under test from an ESD-gun, based on the discharge current waveforms obtained by wide-band measurement, we estimated the amount of the charge released when the spark ... -
Quasi-TEM analysis of coupled microstrip lines on multilayered dielectric
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Coupled microstrip lines (CMLs) are widely used for signal transmission as well as models for various microwave devices. In attempt to minimize physical dimensions of CMLs, these lines are made three dimensional using ... -
Calculation of characteristics of meander slow-wave system with additional shields
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)In this paper a study of meander slow-wave system with additional shields is performed. Aim of a study is to determine an impact of different topologies of meander edges on dispersion properties of a system. Three ... -
Objects having an impact on the environment due to the lightning stroke
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Operations of some objects, as for instance nuclear power plants (NPP), may be influenced by several, quite difficult to prevent natural events. In this group it is possible to distinguish earthquake, hurricane, tsunami, ... -
Influence of cable routing on the flashover distance between lightning protection system and electrical equipment on a building roof
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Lightning protection in a building requires appropriate separation distances to be kept between electrical equipment/installation and LPS (Lightning Protection System). The paper presents results of numerical calculations ... -
Evaluation of meteorological radar antenna radiation
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)The object of this paper is evaluation of antenna electromagnetic radiation results of a new meteorological radar, which planned to be installed near to Vilnius. The results must be compared with permitted level according ... -
Plasma turbulence monitoring by means of low-frequency noise satellite measurements
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)The natural, very low-frequency (VLF) noise emissions are generally looked upon as radio interference. It is incorrect. In fact, these are an effective means for diagnostics and study of dynamic environment. The years-long, ... -
Experimental investigation of electrical apical constriction finder
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Results of experimental investigation of electric apical constriction locator with two excitation frequencies, which has been developed in Lithuania are presented. The lower frequency signal is used for compensation of the ... -
Electrical methods of apical constriction location
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Exact measurement of distance to the apical constriction during root filling of a damaged tooth is important for endodentists. Radiologic method employing X-rays is exact and visual. But it is slow process and exposes the ... -
Multiconductor microstrip line modelling using FDTD method
(22nd International Conference “Electromagnetic Disturbances EMD’2012”, 2012)Multiconductor microstrip lines (MML) are broadly used in various microwave devices. Signal propagation speed along each conductor of the infinite MML is the same and characteristic impedances of each conductor are the ...