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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 21 for “"Partial Discharge (PD)"”.
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Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation
… The second part of this thesis focuses on the PD signal analysis from an on-site PD measurement of the in-house design fiber optic sensors (by Virginia Tech, Center for Photonics Technology). Several commercial piezoelectric transducers (PZTs) were also used to compare the measurement results. …
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A Comparative Analysis of Experimental and Computational Methods for Evaluating Partial Discharge Inception Voltage on Printed Circuit Boards
Partial discharge (PD) presents a significant reliability concern in medium-voltage (MV) and high-voltage (HV) systems, particularly as power electronics applications continue to push to higher voltage levels. One aspect of MV/HV system design that has not received much treatment in the literature …
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A new approach to partial discharge measurements for testing electrical insulation systems
Partial discharge (PD) data has been recorded simultaneously using the conventional IEC60270 `apparent charge' measurement technique and the more recent Radio Frequency (RF) method. Due to the different responses of each system, combined measurement allows additional information on the nature of …
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An optic fiber sensor for partial discharge acoustic detection
Partial discharge (PD) is a very common problem in operating power transformers and is one of the factors that could lead to failure of power transformers, leading to power outage and expensive repairs. The acoustic wave induced by PD can be measured and used for monitoring, diagnosing, and …
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Partial Discharges: Experimental Investigation, Model Development, and Data Analytics
… 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 of PD impact. Nowadays, electrification is penetrating into various fossil-fuel-based industries such …
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The excitation of UHF signals by partial discharge in gas insulated substations
… ultra-high frequency (UHF) signals excited by partial discharge (PD) sources inside gas insulated substations (GIS). PD is indicative of defects in the insulation system and by using couplers mounted at intervals along the GIS, the corresponding bursts of UHF signal can be extracted. This is …
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Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material
For high voltage components, the measurement of partial discharge (PD) is used in the performance assessment of an insulation system. Through modelling the PD process, a better understanding of the phenomenon may be attained. In this work, a model for a spherical cavity within a homogeneous …
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Fiber Optic Sensors for On-Line, Real Time Power Transformer Health Monitoring
… on a transformer with suspicious conditions. Partial 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 …
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Testing for relationship between diagnostic tests and DC BDV of in-serviced aged stator bars of a hydro generator
… resistance (IR), polarization index (PI), partial discharge (PD), tan delta (TD) and Tennessee Valley Authority (TVA) tests. The HV breakdown tests included very low frequency (VLF) and DC tests. Despite using this wider range of tests than has been used before, the test results still …
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Partial discharge denoising for power cables
Partial discharge (PD) diagnostics is considered a major and effective tool for the monitoring of insulating conditions of power cables. As such, a large amount of off-line or online PD measurements have been deployed in power cables during the past decades. However, challenges still exist in PD …
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High-frequency Current-transformer Based Auxiliary Power Supply for SiC-based Medium Voltage Converter Systems
… power supply system design in the MV converter, partial discharge (PD) free and multi-load driving ability are the additional two factors that need to be addressed in the design. However, today’s state-of-the-art products have either low power rating or bulky designs, which does not satisfy the …
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Insulation Design and Analysis for Medium-Voltage SiC-based Power Electronics Building Blocks
… 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 minimize insulation degradation caused by electrical stress. In addition to …
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Partial Discharge Detection and Localization in High Voltage Transformers Using an Optical Acoustic Sensor
A partial discharge (PD) is the dissipation of energy caused by the buildup of localized electric field intensity. In high voltage devices such as transformers, this buildup of charge and its release can be symptomatic of problems associated with aging, such as floating components and insulation …
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Electric Field Grading and Electrical Insulation Design for High Voltage, High Power Density Wide Bandgap Power Modules
… the module, leading to a higher possibility 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 …
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Partial discharge signal propagation, modelling and estimation in high voltage transformer windings
The thesis concerns partial discharge (PD) propagation within a high voltage transformer winding. Location of PDs and magnitude estimation are important tools for both diagnosis and prognosis of the health of large transformers. In reality there is limited access and knowledge of a winding and …
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Using Intrinsic 3rd Harmonics for Large Synchronous Generator Insulation Fault Condition Monitoring
… in large synchronous generators. While Partial Discharge (PD) monitoring has garnered significant research interest, it is well understood that synchronous machines may experience PD activity throughout their lifespan without catastrophic failure. A review of conventional testing methods …
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Failure Modes Analysis and Protection Design of a 7-level 22 kV DC 13.8 kV AC 1.1 MW Flying Capacitor Converter Based on 10 kV SiC MOSFET
… insulation design was successfully verified in a Partial Discharge (PD) experiment. In sequence, an experimental verification utilizing an equivalent circuit based on the fault model demonstrated the efficacy of the protection module. Waveforms extracted while the converter was operating showing …
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Insulation Design, Assessment and Monitoring Methods to Eliminate Partial Discharge in SiC-based Medium Voltage Converters
… it is necessary and important to eliminate Partial Discharge (PD) for such power converters, since the converter system is vulnerable to PDs. Developing an insulation design, assessment and online monitoring method to help reach a compact and PD free insulation system for MV SiC-based …
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Slot discharge characteristics of high voltage machines.
… is concerned with the fundamental mechanisms of discharge generation in the slot section of a high voltage stator winding and the correlations established between these processes and the discharge signal patterns detected at the winding termination by condition monitoring instrumentation. A …
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Research on Vibration-AE Fusion Detection Technology for Metal Particle Defect in GIS under Electromechanical Coupling Condition
… the correlation and complementarity between Partial Discharge (PD) and mechanical vibration. The lack of data fusion analysis constrains diagnosis efficiency, and the evolution process of defect cannot be researched. Therefore, the optimal design and development of a vibration-AE fusion …
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