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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 57 for “"Partial discharge"”.
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Radiometric partial discharge characterisation
… are manifestations of this condition, called partial discharges (PD) and because of this, PD have been subject of an extensive study and investigation. PD identification relies on the intrinsic characteristics of the generated discharge. This thesis shows the behaviour of radiated discharge …
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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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Partial discharge measurements in high voltage motors.
… an on-line technique for detecting and locating partial discharges in the stator winding of a high voltage electrical machine. This technique forms part of an on-line health monitoring strategy for the insulation of high voltage machines. Existing diagnostic techniques and partial discharge …
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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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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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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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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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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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Online Partial Discharge Detection and Localization of Medium-voltage Overhead Distribution Networks
L'abstract è presente nell'allegato / the abstract is in the attachment
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Partial discharge analysis of a candidate winding used in electric aircraft propulsion
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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Signal processing techniques for on-line partial discharge monitoring of high voltage electrical machines.
… and can be characterised by an increase in partial discharge activity over time. This activity can be measured using a well-documented, non-invasive technique. However, current analyses rely on experts visually interpreting results, and making judgements based upon their knowledge and …
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The Modeling of Partial Discharge under Fast, Repetitive Voltage Pulses Using Finite-Element Analysis
… components. In this regard, internal partial discharges (PDs) have the most effect on insulation degradation. Internal PDs which occur in air-filled cavities or voids are localized electrical discharges that only partially bridge the insulation between conductors. Voids in solid or gel …
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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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Partial discharge ageing of polymer insulation under combined AC and DC stress at elevated temperatures
… following approaches:;Equivalent Phase Resolved Partial Discharge (PRPD) plots, Fourier Transform Infrared - Attenuated Total Reflection (FTIR-ATR) Spectroscopy and Dielectric Spectroscopy (DS) measurements were carried out. The performance of HDPE and PP were compared.
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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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Power Transformer Partial Discharge (PD) Acoustic Signal Detection using Fiber Sensors and Wavelet Analysis, Modeling, and Simulation
In this work, we first analyze the behavior of the acoustic wave from the theoretical point of view using a simplified 1-dimensional model. The model was developed based on the conservation of mass, the conservation of momentum, and the state equation; in addition, the fluid medium obeys Stokes …
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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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On-line measurement of partial discharges in high voltage rotating machines.
… high voltage rotating machines by detection of partial 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 …
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