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 51 for “"Induced Currents"”.
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Light-induced currents from oriented purple membrane
This thesis is a report on photocurrent measurements of purple membrane oriented in an polyacrylamide gel. In the first section, the photocurrent measuring system was frequency analyzed from DC to 100 MHz. The optimized conditions that can measure the photocurrent signal in the 70 ms to 32 ns range …
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Impact of Geomagnetically Induced Currents on Power Transformers
… thesis deals with the impact of Geomagnetically Induced Current (GIC) on power transformers in electrical power systems. A simulator to calculate the flows of GIC in an electrical power network, based on an assumed or measured induced geoelectric potential is proposed. This simulator includes all …
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Geomagnetically induced currents and their effect on power systems
… in the Earth’s magnetic field. Geomagnetically induced current (GIC) then enters the power grid and causes unusual real and reactive power flows, voltage fluctuations, frequency shifts, undesired relay operations, high third-harmonic currents and telemetry and supervisory alarm failures. A storm …
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Operational modelling of geomagnetic fields and geomagnetically induced currents
Geomagnetically induced currents (GICs) have long been known to affect power systems adversely. Modelling these GICs usually involves consideration of a chain of coupled systems. The scope of the modelling chain spans multiple disciplines, from solar physics through to geophysics and power …
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Multifractal Analysis of Geomagnetically Induced Currents using Wavelet Leaders
… disturbing communication systems, and inducing currents on pipelines and electric power lines, which in turn may cause increased corrosion or blackouts, among other effects. In this dissertation, we analyze measured electrical signals provided to us by the Finnish Meteorological Institute, which …
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Data-driven prediction of geomagnetically-induced currents in power lines
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-08-01
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Three-phase five limb transformer responses to geomagnetically induced currents
Geomagnetically induced currents (GIC) are quasi-DC currents that result from space weather events arising from the sun. The sun ejects hot plasma in a concept termed ‘coronal mass ejections' which is directed towards the earth. This plasma interferes with the magnetic field of the magnetosphere …
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Effects of geomagnetically induced currents on power transformers and reactors
Bibliography: leaves 106-109.
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Geomagnetically induced currents and its presence in the Eskom transmission network
… existence and occurrence of Geomagnetically Induced Currents (GICs) in the Eskom MTS. The project commenced in January 1999 and is a joint collaboration between Eskom, the University of Cape Town and EPRI. Eskom has been aware since about 1990, that occasional severe geomagnetic storms in the …
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Estimation of Geomagnetically Induced Currents (GICS) in the Namibian transmission network
Geomagnetically Induced Currents (GICs) have become a matter of concern not only to networks located in high magnetic latitude regions but also in networks located in mid-latitude regions. GICs pose a threat of transmission equipment damage which could lead to short power interruptions and …
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Saturation Effects in 3p3L Power Transformers due to Geomagnetically Induced Currents
Geomagnetically induced currents (GIC's) caused by solar storms or other sources of dc excitation can impact the normal operation of power transformers in transmission networks. The impact is caused by the dc current introduced into the windings of a transformer energised with ac, which leads to a …
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Geomagnetically induced currents (GIC) in large power systems including transformer time response
Geomagnetically induced currents (GIC) are the result of changing geomagnetic fields which are a consequence of a geomagnetic disturbance (GMD). The flow of GIC through transmission lines and transformers across the power network could have severe consequences, if the magnitudes of the GIC are high …
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Development of a finite element matrix (fem)three-phase three-limb transformer model for Geomagnetically Induced Currents (GIC) experiments
Geomagnetically Induced Currents (GIC) have been a growing concern within power system operators and researchers as they have been widely reported to lead to power system related issues and material damage to system components like power transformers. In power transformers, GIC impacts are …
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Finite Element Analysis of EMI in a Multi-Conductor Connector
… (EMI) from nearby excited conductors causes induced currents according to Faraday's law which is considered as noise for other conductors. This noise is affected by factors such as distance between the conductors, strength and frequency of currents, permittivity, permeability and conductivity …
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Mutual Coupling Reduction Techniques for Multi-band Base Station Antennas
… of the baseline LB dipole, exhibits dipole-like induced currents which degrade the MB radiation patterns. The currents are suppressed through parallel plate series capacitance integrated along the length of the LB dipole arms to lower the dipole self-impedance, enabling broadband matching using …
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Machine Learning Approach to Predict tDCS-induced Electric Current in the Human Brain
… where in the brain tDCS electrical currents flow. At the same time, effective neuronal engagement from tDCS requires accurate localization of the induced currents to specific brain target regions. Machine Learning (ML) has the potential to significantly improve the accuracy and …
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Non invasive brain stimulation : modeling and experimental analysis of transcranial magnetic stimulations and transcranial DC stimulation as a modality for neuropathology treatment
… principle of electromagnetic induction to focus induced currents in the brain and modulate cortical function. These currents can be of sufficient magnitude to depolarize neurons, and when these currents are applied repetitively (repetitive Transcranial Magnetic Stimulation (rTMS)) they can …
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Alternative methods of vertical plasma control in the Alcator C-Mod Tokamak
… was developed that took into account a model of induced currents in the vacuum vessel and coils. The results of the analysis concluded that there were moderate speed advantages to using state feedback on The OH2 coils, but these were outweighed by the robust operation of EFC PD control. No design …
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Electromagnetic stirring using a travelling magnetic field
… magnetic field is moved along the channel. Induced currents in the fluid interact with the field to give a Lorentz force which drives fluid motion. When the magnetic Reynolds number is large the imposed magnetic field is changed significantly. In this study we consider uniformly-moving and …
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Characterization and modeling of ESD events and near-field scanning calibration structures
… is investigated. The statistical behavior of the induced currents is determined for different parameters such as a change in glass thickness, indium tin oxide layer equivalent resistance, sensor spacing to the ground plane, ESD generator air discharge polarity and test voltage. In addition, a …
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