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 228 for “"short circuit"”.
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Methods for short-circuit identification and location in automobiles
… for electrical failure. A method for locating shorts to the chassis of a car is developed in this thesis. The developed technique is capable of detecting the approximate location of current being injected into the body of the car using several sensors placed strategically throughout the car. …
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Sahraei failure criteria for detection of short circuit in lithium-ion batteries
… fracture within battery cells, which can trigger short circuits, leading to thermal runaway and explosions. Consequently, understanding battery behavior under various loading conditions and developing predictive models for failure is essential for enhancing safety and optimizing protective …
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Advanced Faraday cage measurements of charge, short-circuit current and open-circuit voltage
(cont.) above atmospheric pressure caused both positive current and negative current pulses with the negative pulse larger than the positive pulse. A pressure decrease of more than 10psi below atmospheric pressure also caused both positive current and negative current pulses with the positive …
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A three phase short circuit analysis of the Naval Weapons Laboratory electrical distribution system
A three phase short circuit analysis was performed on an existing industrial distribution system. Justifications and reasons for carrying out such a study are discussed, along with the calculating procedures, assumptions, and techniques. Sample calculations are illustrated, and a complete tabular …
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PCB-Embedded Phase Current Sensor and Short-Circuit Detector for High Power SiC-Based Converters
… current sensor measurement is used for fast short-circuit detection and protection of the SiC MOSFET semiconductor switches. Furthermore, comparison with conventional detection and protection method used in automotive IGBT applications is shown where novel protection showed superior …
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Reactive power compensation, system and voltage stability of an industrial network with short circuit limiting coupler
… voltage and transient stability conditions. A short circuit limiting coupler is designed and the transient and voltage stability studies are performed with a short circuit limiting coupler (SLC) applied at the two 132 kV incoming supply lines from Eskom. The simulations are based 011 solving …
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Development of a constitutive model predicting the point of short-circuit within lithium-ion battery cells
… and enclosures to preclude possible short circuit and thermal runaway of an installed battery is necessary. Homogenized computational cells have been developed at the MIT Crashworthiness laboratory and this research validates and refines those models for use in future work with both …
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The calculation of three-phase short-circuit currents of a synchronous machine by means of the differential analyzer
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1932
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Synchronous Condensers and Grid-Forming Control for the Integration of Inverter-Based Resources in Weak Grids
… inertia of SGs, and they do not contribute to short-circuit fault currents as much as SGs do. The lack of strength and inertia increases the risk of instability during contingencies, e.g., short-circuit faults. This dissertation investigates and proposes methodologies to enhance the stability …
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Solving Series Resistance Problems In GaSb Thermophotovoltaics with Graphene and Other Approaches
… under AM 1.5 conditions. These devices displayed short circuit current values as high as 40 mA/cm2 but were found to have poor series resistance. The parasitic resistive characteristics were factored out of the measured cell data and it was found that the photocurrent for the fabricated devices …
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Large wind farm aggregation and model validation
… wind farm during a simulation study? 2. When a short circuit happens in a large wind farm, some wind turbines trip while others do not. What is the mechanism to understand and control the number of tripping wind turbines? 3. Is there any way to improve the low voltage ride‐through of a large …
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Investigation into voltage and angle stability of a hybrid HVAC-HVDC power network
… terminal voltage responses during a three-phase short circuit disturbance was also used to analyze the voltage stability of the networks. For the transient stability study, several case studies were investigated and their dynamic performances during three-phase short circuit perturbations were …
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Análise de zeros atrasados em unidades offshore
… to appear in electrical systems, whenever a short circuit occurs somewhere nearby electric generators buses. In the case of offshore production platforms, the so called asymmetry, along with other specific conditions, may give rise to the so called “delayed current zeros” phenomenon in the …
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Material characterization and axial loading response of pouch lithium ion battery cells for crash safety
… to predict mechanical deformation and related short circuit behavior of Li-ion battery cells and stacks in real world impact scenarios. In an effort to continue to refine and validate this modeling tool, characterization testing was conducted on battery cell pouch material using uniaxial stress …
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Material characterization of high-voltage lithium-ion battery models for crashworthiness analysis
… mechanisms of thermal runaway caused by internal short circuit. In phase one, medium and large sized cells at low state of charge (SOC) were impacted or compressed while measuring punch load, displacement, cell voltage, and surface temperature until an internal short circuit was detected, followed …
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Fault detection and location in modular trees
… in the discussion of the fault location problem. Short circuit faults and broken and short circuit faults are considered in the discussion of the fault detection problem. In either the fault detection or location case, detection conditions for each fault in a cell are derived. Tests for locating …
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Distributed Electric Aircraft Propulsion Architectures with Fault Protection Strategy
… associated with effectively limiting short-circuit fault currents due to the low cable impedance. Due to this, the fault current rises sharply, requiring an enhanced protection strategy. To accomplish this, an algorithm is proposed utilizing an I2t and the current limiting-based …
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Transient analysis of six-phase synchronous machines
… included in the development of a d-q equivalent circuit. The six-phase machine is constructed from a three-phase machine by splitting the stator windings into two equal three-phase sets. The six-phase machine reactances and resistances are derived by relating their values to the known three-phase …
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Nanoimprint lithography for light trapping applications in solar cells
… (Si) thin-film solar cells is studied. The short-circuit current enhancement for cells with a back reflector is 34% and 30% with a multi-disperse array and the mono{u00AD}dispersed array respectively, compared to 13% enhancement due to the reflector alone. The better performance of …
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