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 28 for “"power transformer"”.
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Power transformer magnetization under GIC/GMD
… induced currents (GIC) could saturate a transformer core. Two significant effects are the abnormal stray flux in transformers and extremely large harmonic contents in excitation currents, which can lead to serious equipment damage and power system misoperation. Such incidents have …
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The Modernization of Large Power Transformer Tanks
<p>Due to the current demands placed on the power grid in terms of climate change, increasing urbanization, and terrorist attacks, the U.S. government in response to these demands, mandated that all the grid components be modernized in order to increase their reliability. As a critical component of …
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Optical Temperature Monitoring of Electrical Power Transformer Networks
… network model designed to monitor temperature of transformers at multiple substations from one central location. Fiber Bragg Grating (FBG) has been used as the optical sensing element for transformer temperature monitoring. Suitable FBG parameters and specifications have been investigated and …
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The effects of separable cores on high power transformer design
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Integrating the power transformer protection scheme to Telecontrol Terminal Unit (RTU)
Submitted in fulfilment of the requirements for the degree of Masters in Electrical Engineering, Durban University of Technology, Durban, South Africa, 2018.
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Ageing Assessment of Power Transformer Kraft Paper Insulation Using Optical Speckle
Power transformers play an important role in electric networks. Copper windings wrapped in kraft paper and immersed in a tank of mineral oil are their main composition. Oil-impregnated paper is a very common insulator in power transforms, due to its durability and endurance. Kraft paper, a …
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Power transformer health assessment derived from low energy and dissolved parameters
This dissertation studied the mechanisms of transformer health in terms of energy and dissolved parameters and establishes a novel method to identify a trigger for a change in transformer condition from normal to defective state. The study took the form of both analytic research to create a low …
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Design Methodology for an Ultra-High Efficiency Coreless Resonant Power Transformer
Coreless resonant power transformers, operating at high frequency, have several advantages over the traditional iron core transformer. They have a simple structure, are lighter, cheaper, and more efficient due to the elimination of core losses. For a given cooling capacity, pushing the efficiency …
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Study of Power Transformer Abnormalities and IT Applications in Power Systems
With deregulation, diagnosis and maintenance of power equipment, especially power transformers, become increasingly important to keep power systems in reliable operation. This dissertation systematically studied two kinds of transformer failure and abnormality cases, and then developed a new …
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Artificial Intelligence Applications in the Diagnosis of Power Transformer Incipient Faults
… (AI) applications for the diagnosis of power transformer incipient fault. The AI techniques include artificial neural networks (ANN, or briefly neural networks - NN), expert systems, fuzzy systems and multivariate regression. The fault diagnosis is based on dissolved gas-in-oil analysis …
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Fiber Optic Sensors for On-Line, Real Time Power Transformer Health Monitoring
High voltage power transformer is one of the most important and expensive components in today's power transmission and distribution systems. Any overlooked critical fault generated inside a power transformer may lead to a transformer catastrophic failure which could not only cause a disruption to …
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Investigating the application of frequency response analysis for diagnosing tap changer on power transformer
Electrical distribution power transformers operate on transmission and distribution systems which require different voltage levels. A sufficiently constant level of grid potential is maintained by mechanically regulating the turn ratio in the transformer winding, which can be achieved through OLTC …
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Evaluation and mitigation of the undesired effect of DC bias on inverter power transformer
… systems (non-grid connected), Uninterruptible Power Supplies (UPS) and, more recently, in distributed generated systems (DGs). DG systems are based on grid connected inverters and are increasingly being connected to utility grids to convert renewable energy sources to the utility grids. Such …
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Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation
… quadrant in reference to the applied sinusoidal transformer voltage.
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A wireless sensor network for vibration measurement
… of sensornets is online, non-intrusive power transformer monitoring.
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High-frequency multi-resonant power conversion techniques
… technique, a novel concept in dc/dc power conversion, is proposed. The essence of the multi-resonant power conversion is the effective utilization of the major parasitic reactive components of the power stage, including the leakage inductance of the power transformer, output …
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Design of High-Power High-Frequency Coreless Transformer Systems
… concerns advances in the design of coreless power transformers as well as associated power electronics, which can also add extra functionality. Compared to traditional core-based transformers that require large, heavy and costly magnetic cores to guide magnetic flux between windings, the …
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First principles design of coreless power transformers
… designing novel 4-coil high frequency coreless power transformers from first principles via lumped equivalent circuit models. The procedure is applied to construct a design for 100W transformer with an S21 parameter value of .96. Using MATLAB and LTspice, simulation tools have been developed to …
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Modeling, analysis, and design of a 10 kVA, 20 kHz transformer
The design of a high-frequency transformer at levels above 1 kVA is limited by the winding and core materials which are available. This res~arch presents methods for the design and modeling of a 10 kVA transformer operating at a frequency of 20 kHz using readily available materials. A special …
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A neural fuzzy approach to modeling the thermal behavior of power transformers
… and 27 MVA Forced Air (FA)-cooled class of power transformers. The models were derived from real data of temperature measurements obtained from two industrial power installations. A comparison of the proposed techniques is presented for predicting top and bottom-oil temperatures based on the …
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