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.
Results
Showing 1 to 12 of 12 for “"insulation systems"”.
-
Charge transport and breakdown physics in liquid/solid insulation systems
… when they reach any liquid-immersed solid insulation. Surface flashovers usually propagate faster and further than streamers in similar electric field intensity. Charge generation and transport is crucially important in liquid dielectric breakdown, since without the presence of the electric …
-
Thermal properties of granular silica aerogel for high-performance insulation systems
… at MIT of a high-performance panelized insulation system based on silica aerogel. Two test methods were used for measuring the thermal conductivity of the granules: the transient hot-wire technique and the guarded hot-plate system. Utilizing the hot-wire set-up, it was demonstrated that …
-
A new approach to partial discharge measurements for testing electrical insulation systems
… PD sources typically encountered in practical insulation systems, such as free particles, floating electrodes and voids. When RF energy is plotted against apparent charge for a large number of discharges, characteristic patterns appear which may be used to distinguish between PD sources. …
-
Design of universal insulation systems for low voltage and high voltage rotating electrical apparatus
… the design and specification of electrical insulation systems optimized based on operating voltage. This apparatus specific design approach, while effective, necessitates a variety of electrical insulation system topologies and material choices. It is proposed that a universal insulation …
-
Partial Discharges: Experimental Investigation, Model Development, and Data Analytics
Insulation system is an inseparable part of electrical equipment. In this study, one of the most important aging factors in insulation systems known as partial discharge (PD) is targeted. PD phenomenon has been studied for more than a century and yet new technologies still demand the investigation …
-
Using Intrinsic 3rd Harmonics for Large Synchronous Generator Insulation Fault Condition Monitoring
… generator failures continue to occur. Detecting insulation failures in large machines remains a complex issue and an area of active research. The primary objective of this project is to propose a simple and effective method for detecting compromised insulation in large synchronous generators. …
-
Predicting the thermal performance of bio-based cold chain packaging system
… sustainability of passive cold chain packaging systems. The first phase of the study (Chapter 1) focuses on predicting the thermal performance of bio-based ISCs through finite element modeling (FEM). Material characterization was conducted using Differential Scanning Calorimetry (DSC) and Heat …
-
Analytical and numerical studies of heat and moisture transfer through porous insulation
… of heat and moisture transport through a porous insulation in the presence of condensation, with impermeable, adiabatic vertical boundaries, and with one horizontal boundary facing a warm humid ambient and the other facing a cold impermeable surface. The analytical model is developed for heat and …
-
The Modeling of Partial Discharge under Fast, Repetitive Voltage Pulses Using Finite-Element Analysis
… power will flow through power electronics systems. Wide bandgap power modules that can tolerate higher voltages and currents than silicon-based modules are the most promising solution to reducing the size and weight of power electronics systems. These wide-bandgap power modules constitute …
-
Evaluation of the thermal performance and cost effectiveness of radiant barrier thermal insulation materials in residential construction
Reducing heating and cooling systems loads in buildings is a cost effective way to decrease energy consumption in residential houses. This reduction can be achieved in many ways including proper insulation of the building envelope. In recent years, considerable attention was given to the use of …
-
Electromagnetic Interference and Compatibility within SiC-based Medium Voltage Converters
… key challenges of the overall design because MV insulation systems usually have very bulky designs that decrease the overall power density; meanwhile, for high power applications, the large DM current flowing on the inductor windings is the key reason for the total inductor loss. As universal …
-
Elucidating the mechanisms behind pre-breakdown phenomena in transformer oil systems
… use of dielectric liquids for high voltage insulation and power apparatus cooling is due to their greater electrical breakdown strength and thermal conductivity than gaseous insulators. In addition, their ability to conform to complex geometries and self-heal means that they are often of …