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 9 of 9 for “"Insulation degradation"”.
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Physical modeling of electrical conduction in printed circuit board insulation
This thesis is concerned with understanding the degradation of electrical and electronic components in automobiles due to environmental effects. A special emphasis is placed on understanding the physical processes underlying the degradation, so that accelerated reliability tests can be specified …
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Fiber Optic Sensors for On-Line, Real Time Power Transformer Health Monitoring
… discharge (PD) is not only a precursor of insulation degradation, but also a primary factor to accelerate the deterioration of the insulation system in a transformer. Monitoring of PD activities and the concentration of PD generated combustible gases dissolved in the transformer oil has …
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Improvement of distribution transformer fault analysis using FRA method
… to non-mechanical changes such as winding insulation. The measured FRA result needs to be compared with the previous measurement to identify any variation between them. The variation will indicate mechanical changes in the transformer. However, interpreting the variation to determine the …
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On-line measurement of partial discharges in high voltage rotating machines.
… discharges (PD) which are indicative of stator insulation degradation. Partial discharge manifests itself in various forms which can be detected using various electrical and non-electrical techniques. The electrical method of detecting small current pulses generated by PD using a Rogowski coil …
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The Modeling of Partial Discharge under Fast, Repetitive Voltage Pulses Using Finite-Element Analysis
… than silicon-based devices. However, from the insulation side, frequency and slew rate are two of the most critical factors of a voltage pulse, influencing the level of degradation of the insulation systems that are exposed to such voltage pulses. The shorter the rise time, the shorter the …
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Insulation Design and Analysis for Medium-Voltage SiC-based Power Electronics Building Blocks
… with a 9-level dc bus rated for 24 kV. The insulation quality and MV performance of all PCBs have been assessed through partial discharge (PD) analysis using an Omicron MPD 600. The high-voltage (HV) design approach takes into account the mitigation of peak electric field intensity to …
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Electric Field Grading and Electrical Insulation Design for High Voltage, High Power Density Wide Bandgap Power Modules
… of "partial discharge (PD)" and, in turn, insulation degradation and, eventually, breakdown of the module. Unless the discussed high E issue is satisfactorily addressed and solved, realizing next-generation high power density WBG power modules that can properly operate will not be possible. …
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Online partial discharge detection and signal analysis for high voltage cables
Partial Discharges are symptoms of insulation degradation that continually promotes the deterioration of the insulation condition, eventually leading to permanent failures. The PD event itself is not dangerous but it is the state of the discharge activity that can lead to unforeseen failures. Hence …
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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. …