Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"arcing"”.
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Investigation of disintegration and arcing in electric fuses
This thesis essentially presents the experimental investigation of the fundamental phenomena of electric fuse element disintegration and its causation and influence on the subsequent fragmentation of the fuse elements when subjected to excessive fault currents. The basis of the study involved …
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Diagnosis of arcing in retaining rings of turbogenerators
… component of the entire turbogenerator system. Arcing in retaining rings is a very serious problem and could easily escalate to a full-blown failure. In this project we diagnose arcing in the retaining rings. We determine the most likely mechanism by which arcing occurs and the category of …
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Arcing mitigation and predictions for high voltage solar arrays
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Study of Breakdown/arcing for High Power RF Antennas on Fusion Applications
CCl4 and XeF2 were used as sources of halogen ions to take advantage of the ion bombardment for breakdown amelioration by modification of the electrodes. It was found that CCl4 stabilizes the emission current but increases the enhancement factor of copper electrodes. XeF 2 exhibits a …
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Arcing on high voltage solar arrays in low earth orbit : theory and computer particle simulation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Elimination of PZT thin film breakage caused by electric current arcing and intrinsic differential strains during poling
… metal layer coverage. Second, the electrical arcing that is frequently taking place during poling sends a mechanical shock wave through the substrate. Electrical arcing is caused by metal overspray during the sputtering process. Poling breakage was experimentally reduced by 70% by redesigning …
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Detection of arcs in automotive electrical systems
… method for the detection of DC electric arcing. This is a concern for forthcoming advanced automotive electrical systems which consist of higher DC electric power bus voltages, such as the automotive industry proposed 42 volt standard. At these higher voltages, wire faults can lead to …
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Detection of electric arcs in 42-volt automotive systems
… danger at this new voltage is stable electrical arcing. At the higher voltage, stable electric arcs do not self extinguish and can cause damage to the arcing conductors and cause a fire. This work evaluates possible methods to use to detect and stop electrical arcing before any major damage can …
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Supercapacitor-assisted Arc Management (SCA2M) technique for DC circuit breakers in low-voltage applications
… (WaiPER) in New Zealand to address the DCCB arcing issue, with promising experience gathered from two decades of past work based on non-traditional supercapacitor applications known as supercapacitor-assisted (SCA) techniques, achieving multiple patents and industry products. This thesis aims …
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Arc Fault Circuit Interrupter Development for Residential DC Electricity
… an effective method for determining when arcing is occurring. Our method is primarily based on comparing the frequency spectrum of current flowing through the circuit during an arcing event to a known characteristic spectrum. Once an arc has been identified, our interrupter is capable of …
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Creating a Comparative Map of Relative Power for DC ARC Flash Methodologies
… However, the NFPA70E also mentions a Detailed Arcing Current and Energy Calculations Method which contains formulas proposed by various researchers who conducted their own DC arc flash testing but there is scarce info on how these methods compare to the Maximum Power Method. This paper will …
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Calorimetric measurements of a Yang-Koldamasov device
… earlier demonstrations exhibited electrical arcing perpendicular to the flow of oil, while the current device shows only arcing in the direction of oil flow. Future work is being conducted by FRC to identify the reasons that the current apparatus behaves differently.
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Models for electromagnetic coupling of lightning onto multiconductor cables in underground cavities
… voltages reached high enough levels, electrical arcing could have occurred from the abandoned cable. Electrical arcing is known to be an effective ignition source for explosive gas mixtures. Two coupling mechanisms were measured: direct and indirect drive. Direct coupling results from the …
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Dielectric Properties of Minerals and Ores and the Application of Microwaves for Assisted Comminution and Ore Sorting
… very high conductivities, which caused severe arcing. A study on a Cu porphyry ore found that an upper boundary exists for the power density, above which the ore will experience excessive arcing. Bench-scale microwave infrared and conductivity sorting tests on a Cu-Ni ore found general …
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Analysis of Electromagnetic Launcher Design and Modeling
… rails ensures that the rails can withstand the arcing inflicted by the kilo-Ampere current along the rails very well compared to other materials. Also, the copper in the tungsten alloy ensures high conductivity while the tungsten provides structural integrity to the rails during arcing between …
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The analysis of acoustic noise in a submerged arc furnace
… the ore by means of resistance heating and/or arcing. The exact mechanism is unknown. The furnace is rated at 48 MVA maximum and the electrodes carry currents of the order of 100 kiloamperes. The metal is tapped approximately every four hours. The term submerged arc is used because the furnace …
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Modeling of AC circuit breakers in the electromagnetic transients program
… Program (EMTP). Various models for the arcing process were evaluated, and the modified Mayr equation was chosen for the model. Other equations were added to demonstrate the generality of the algorithm developed. Since the Electromagnetic Transients Program was not designed to accommodate …
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PMN/PT and rutile LAC voltage breakdown dependency with respect to backfill gas, voltage rates of rise, and pressure
… theoretical tools such as dielectric stimulated arcing, Paschens law on breakdown as a function of pressure and the Townsend condition in order to try and predict how pressure and gas may affect LAC's. It will also develop a set of experiments that will vary pressure, backfill gasses and …
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Fire Hazard of the Contemporary American Home
… main categories: Operating Equipment, Electrical Arcing, and Hot or Smoldering Objects. Grouping together the items Upholstered Sofas, Mattresses, and Bedding as representing soft furnishings in the house, contribute the second greatest amount of risk. The main Heat Source for these items is Other …
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