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 108 for “"Phase Angle"”.
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The Remote Measurement of Phase Angle
… pair of substations should not be made until the phase angle between their voltages is small, There has been, for many years, a need for the measurement of this phase angle, with the results displayed in the distribution Control Room, A direct measurement may be significantly in error, due to the …
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Measurement and digitization of phase angle modulated sensor data
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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DSP phase angle controlled three phase to single phase uninterruptible power supply
Includes bibliographical references.
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Data-driven Protection of Transformers, Phase Angle Regulators, and Transmission Lines in Interconnected Power Systems
… and data availability.</p><p>Power transformers, Phase Shift Transformers or Phase Angle Regulators, and transmission lines are critical components in power systems, and ensuring their safety is a primary issue. Differential relays are commonly employed to protect transformers, whereas distance …
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Real-Time Detection of GPS Spoofing Attack with Hankel Matrix and Unwrapped Phase Angle Data
… attack as another FDIA with falsified phase angle data. Since identifying correct attack type is paramount, we have attempted to develop an algorithm to distinguish these two attacks. Previous researchers exploited low-rank approximation of Hankel Matrix to differentiate between FDIA …
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EVALUATION OF PHASE ANGLE AS A PRACTICAL PARAMETER FOR LOW TEMPERATURE SPECIFICATION GRADING OF ASPHALT BINDERS
… study aims to examine the viability of limiting phase angle measurement as a credible alternative to the laborious extended BBR (EBBR) procedure. In this study, a total of 239 samples were tested from various agencies and are grouped into tank samples, core samples and loose mix samples. Agency A …
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Use of phase angle in lieu of critical crack tip opening displacement for asphalt binder specification
… criteria used. This study considers how phase angle specification limits can be used in lieu of Critical Crack Tip Opening Displacement (CTOD) as a more practical asphalt binder acceptance property. Two sets of binders were tested using the Dynamic Shear Rheometer to determine the …
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Design and Construction of an Optical Polarimeter for the Study of Ice-like Analogs using Near Zero Phase Angle Measurements
… measuring polarized backscatter near zero phase angles have suggested strong presence of multiple scattering effects. Radar data for Mercury, Moon and other Icy Galilean satellites exhibit high circular polarization ratios with decreasing phase angle that indicates the possible presence of …
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Synthesis of a finite two-terminal network whose phase angle is a prescribed function of frequency : with application to the design of symmetrical networks
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1948.
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Comparison of standard impedance spectroscopy response to aqueous metal ions using plain vs. surface derivatized gold interdigitated electrodes
… reproducibility of the raw impedance and phase angle data, and possible variation of the background response for the gold IDE array in solutions of different metal ions remain an issue. Primary experimental emphasis is on the reproducibility of standard impedance and phase angle data for …
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The Lunar Exosphere: Spatial and Temporal Variations of Sodium and Potassium Emissions from November 2013 to May 2014
… full moon and spanned several nights with lunar phase angle coverage ranging from 65.6° (waxing) to 78.7° (waning). Observations were concurrent with the NASA LADEE mission science and instrument testing phases. We used a dial etalon Fabry-Perot spectrometer with a resolving power of 180,000 (1.7 …
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Power System State Estimation and Renewable Energy Optimization in Smart Grids
… power system state estimation using PMUs, when phase angle mismatch exists in the measurements. In particular, we build a measurement model that takes into account the measurement phase angle mismatch. We then propose algorithms to increase state estimation accuracy by taking into account the …
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AC motor speed performance improvement using fuzzy logic control
… fuzzy logic controller design to control single phase induction motor. The controller strategy is done through phase angle control method. The phase angle is controlled by controlling the firing angle delay of the triac. This controller system is implemented and simulated using MATLAB Simulink …
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Viscoelastic Modeling of Straight and Modified Binders at Intermediate and High Temperatures
… of the complex shear modulus (|G*|) and the phase angle (d) were developed using the matching function approach and validated by an experimental program. The dynamic mechanical properties of two typical paving grade binders and three modified binders were tested at intermediate and high …
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An improved algorithm for phase-based voltage dip classification
In this thesis, a new phase-based algorithm is developed, which overcomes the shortcomings of the Bollen algorithms. The new algorithm computes the dip type based on the difference in phase angle between the measured voltages.
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The Development of a Phase Locked Wind Turbine Blade Finite Element Model to Predict Loads and Deflections During Fatigue Testing
… systems. These systems do not allow for the load phase angle to be controlled, and the maximum load application in the edge and flap directions are allowed to vary. The PhLEX (Phase Locked Excitation System) under development utilizes a resonant excitation system in order to reduce hydraulic …
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Computer relaying for EHV/UHV transmission lines
… more nonlinear flexible devices such as the phase shifter and the advanced compensation system will be put into use. Once a fault occurs on such a system, a delay in clearing the fault is usually not permissive. This requires a new generation of relays which have high security and …
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Self-synchronized converter for fast synchronization between low voltage microgrid and inverter connection
… research, a fast-synchronization between single-phase microgrid and inverter in low voltage, which is based on virtual synchronous converter (VSCon) technique is been developed. This technique does not require any phase locked loop (PLL) circuit as an external control structure for the …
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An Investigation of Fraxinus Americana Branch Sway Using a 3 Dimensional Motion Capture System
… conditions. Individual branch frequencies and phase angle values were calculated after portions of the tree crown mass were removed. Wind loaded branch sway frequencies ranged between 0.2 and 1.1 Hz while the pull and release test induced mean frequencies of 0.2 Hz. There was no significant …
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Investigation of projectile coherence effects in fully differential studies of 75 keV proton - H₂ collisions
… As reported in recent years, the scattering angle dependence of the doubly differential cross sections (DDCS) are significantly affected by the projectile coherence properties. The interference structures were observed for the coherent beam, however were absent for an incoherent beam. …
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