Download or read book Acoustic Detection of Partial Discharge Using Signal Processing and Pattern Recognition Techniques written by Anas Swedan and published by . This book was released on 2010 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this thesis, artificial neural networks are utilized to enhance the acoustic PD detection under different insulation conditions. Experiemental results have shown that high detection rates of PD can be obtained under different conditions."--Abstract.
Download or read book Detection and Pattern Recognition of Partial Discharge in Electric Machine Coils with Pulsed Voltage Excitation written by Han Xiong and published by . This book was released on 2019 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: For over 80 years, partial discharges (PDs) have been monitored in traditional 50-/60-Hz medium- to high-voltage electric machines to detect and determine various types of defects in the insulation system. The PD pattern and changing trend revealed by the continuous monitoring have also been used as an indicator of insulation health condition. With the development of modern power electronics, an increasing amount of medium- to high-voltage electric machines are now driven by variable speed drives (VSDs) for higher efficiency and better control capability. The voltage excitation, instead of the traditional low-frequency sinusoidal voltage, becomes high-frequency pulsed voltages, or pulse-width-modulated (PWM) voltages. The short rise and fall times of the PWM voltages, or often referred to as the fast dV/dt, subject the insulation system to more severe electrical stresses. A prominent example is the reflected wave phenomenon when the reflected voltage at the machine terminals can reach up to twice the DC bus voltage, or even up to four times in extreme cases. Such overvoltages have been reported to cause premature winding insulation breakdown. The insulation condition monitoring using effective PD detection becomes vital in such applications using VSDs. The fast dV/dt, nevertheless, causes significant switching noise in the traditional electrical PD detectors such as the coupling capacitors, crippling their capabilities to effectively detect PD, especially for medium- to high-voltage machines. Even if PDs can be successfully measured, the traditional PD pattern recognition techniques for electric machines, such as phase-resolved analysis, are no longer applicable because such techniques focus on the phase information of the PD occurrence with respect to the AC voltage. For pulsed voltages, the voltage switching plays a far more significant role than the phase of the reference voltage. This work strives to tackle the challenges in the detection and pattern recognition of PDs in electric machine insulation systems with pulsed voltage excitations. First a PD detection platform has been established to effectively detect and quantify PD events with pulsed voltage excitations. This platform employs nine sensors catering to five different PD physical manifestations, including electrical current, electromagnetic wave, optical light emission, acoustic ultrasound emission, and chemical ozone emission. PDs have been successfully and accurately measured for three types of samples: twisted pairs made of magnet wires, hand-wound stator coils, and professionally fabricated medium-voltage form-wound coils. Further a PD data processing procedure dedicated for data collected under pulsed voltages has been matured. Various machine learning algorithms and signal processing techniques are employed to implement feature extraction and pattern recognition from the collected PD data. The pattern unveiled facilitates the classification of PD pulses from different sources and locations. Moreover, the PD characteristics and patterns are investigated with pulsed voltage excitations of different parameters such as dV/dt. The effects of pulsed voltages, when compared with power-line-frequency AC voltage excitation, are hence demonstrated. Preliminary lifetime tests are performed on the twisted pair samples. The impact of recurring PDs on the lifetime of the low-voltage electric machine insulation system is further discussed in this dissertation.
Download or read book Proceedings of the 21st International Symposium on High Voltage Engineering written by Bálint Németh and published by Springer Nature. This book was released on 2019-11-27 with total page 1569 pages. Available in PDF, EPUB and Kindle. Book excerpt: High voltage engineering is extremely important for the reliable design, safe manufacture and operation of electric devices, equipment and electric power systems. The 21st International Symposium on High Voltage Engineering, organized by the 90 years old Budapest School of High Voltage Engineering, provides an excellent forum to present results, advances and discussions among engineers, researchers and scientists, and share ideas, knowledge and expertise on high voltage engineering. The proceedings of the conference presents the state of the art technology of the field. The content is simultaneously aiming to help practicing engineers to be able to implement based on the papers and researchers to link and further develop ideas.
Download or read book Partial Discharges PD written by Norasage Pattanadech and published by John Wiley & Sons. This book was released on 2023-07-31 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: PARTIAL DISCHARGES (PD) — DETECTION, IDENTIFICATION AND LOCALIZATION Explore state-of-the-art partial discharge measurement techniques In Partial Discharges (PD) — Detection, Identification and Localization, a team of distinguished electrical engineers delivers a comprehensive treatment of the behavior, modeling, measurement, monitoring, localization, and evaluation of partial discharges. It includes coverage of all major advancements in the field that have occurred over the last few decades. It also discusses partial discharge phenomena, detection methods, and strategies for analyzing and processing collected data. Mechanisms of insulation failure are explored, as is the denoising of partial discharge measurement data and the localization of partial discharge in large, high-voltage equipment. Non-electric principles and procedures are discussed, and the book offers a variety of tables, figures, and photographs to illustrate the concepts discussed within. Partial Discharges(PD) also provides: A thorough introduction to the physical behavior of partial discharges, including their causes and classification Comprehensive modeling of partial discharge behavior, including classical and dipole discharges Practical discussions of the measurement of partial discharges, including the electrical method, partial discharge decoupling, and pre- and post-processing of partial discharges In-depth examinations of the monitoring of partial discharge behavior, including methods and realization Perfect for electrical engineers engaged in electrical power engineering, Partial Discharges (PD) will also earn a place in the libraries of research and development specialists employed in the manufacturing, quality testing and operation of electrical systems.
Download or read book Data Analytics for Renewable Energy Integration Technologies Systems and Society written by Wei Lee Woon and published by Springer. This book was released on 2018-11-16 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the revised selected papers from the 6th ECML PKDD Workshop on Data Analytics for Renewable Energy Integration, DARE 2018, held in Dublin, Ireland, in September 2018. The 9 papers presented in this volume were carefully reviewed and selected for inclusion in this book and handle topics such as time series forecasting, the detection of faults, cyber security, smart grid and smart cities, technology integration, demand response, and many others.
Download or read book Partial Discharges in Hydroelectric Generators written by Victor Dmitriev and published by Springer Nature. This book was released on 2024-01-05 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective implementation of predictive maintenance programs in power plants requires the online condition monitoring of electrical generators. This book offers a comprehensive guide on the measurement, detection, and interpretation of partial discharges in hydroelectric generators. It covers a range of essential topics such as the physics of partial discharge phenomenon, various types of defects and partial discharge patterns, sensors and acquisition procedures, signal processing techniques, automatic classification of discharge types, and correlation between partial discharge occurrence and ozone generation. Numerical modelling of partial discharges and calculation of the associated radiating electromagnetic fields are also discussed. To aid understanding, the book provides theoretical explanations, practical examples, and functional Python code on Google’s Colaboratory platform. This book is a valuable resource for anyone seeking a deep understanding of partial discharges in hydroelectric generators. Presents in-depth theory with examples; Provides experimental data illustrating effects of PD in machine components; Includes functional Python and C code examples.
Download or read book Acoustic Emission written by Wojciech Sikorski and published by BoD – Books on Demand. This book was released on 2012-03-02 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic emission (AE) is one of the most important non-destructive testing (NDT) methods for materials, constructions and machines. Acoustic emission is defined as the transient elastic energy that is spontaneously released when materials undergo deformation, fracture, or both. This interdisciplinary book consists of 17 chapters, which widely discuss the most important applications of AE method as machinery and civil structures condition assessment, fatigue and fracture materials research, detection of material defects and deformations, diagnostics of cutting tools and machine cutting process, monitoring of stress and ageing in materials, research, chemical reactions and phase transitions research, and earthquake prediction.
Download or read book Journal of Acoustic Emission written by and published by . This book was released on 1994 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Partial Discharge Classification Using Acoustic Signals and Artificial Neural Networks and Its Application in Detection of Defects in Ceramic Insulators written by Satish Kumar Polisetty and published by . This book was released on 2019 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Online condition monitoring of critical assets constitutes one method whereby the electrical insulation industry can help safeguard grids through the avoidance of system outages due to insulation failure. This thesis introduces a novel approach for monitoring the condition of outdoor ceramic insulators based on partial discharge (PD) measurements. The presence of physical defects such as punctures, broken porcelain, and cracks will ultimately lead to the initiation of PD activity in outdoor ceramic insulators. In addition to defects, surface discharges such as that caused by corona and dry band arcing are also very common, particularly in wet and polluted outdoor insulators. Such a discharge activity that originates in these kinds of conditions can cause flashover or insulator failure, resulting in power outages. Measuring early-stage discharge activity is thus very important as a means of avoiding catastrophic situations in power networks. The work presented in this thesis involved initial tests conducted to distinguish between different types of controlled discharges generated in the laboratory. The next step was the implementation of an artificial neural network (ANN) for classifying the type of discharge based on selected features extracted from the measured acoustic signals. First, relatively high-frequency acoustic signals are transformed into low-frequency signals using an envelope detection algorithm imbedded in the commercial acoustic sensor. A fast Fourier transform (FFT) is then applied to each low-frequency signal, and finally, 60 Hz, 120 Hz, and 180 Hz are used as input feature vectors for the developed ANN. This initial research was then extended to include testing of the proposed diagnostic tool on a practical insulation system, and outdoor ceramic insulators were selected for this purpose. Three types of defects were tested under laboratory conditions: a cracked ceramic insulator, a healthy insulator contaminated by wetting with salt water, and a corona generated from a thin wire wound to the ceramic insulator. Both a single disc, and three discs connected in an insulator string were tested with respect to these defects. For both controlled samples and full insulators, a recognition rate of more than 85 % was achieved.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transformer Ageing written by Tapan Kumar Saha and published by John Wiley & Sons. This book was released on 2017-08-28 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: A one-stop guide to transformer ageing, presenting industrially relevant state-of-the-art diagnostic techniques backed by extensive research data Offers a comprehensive coverage of transformer ageing topics including insulation materials, condition monitoring and diagnostic techniques Features chapters on smart transformer monitoring frameworks, transformer life estimation and biodegradable oil Highlights industrially relevant techniques adopted in electricity utilities, backed by extensive research
Download or read book Partial Discharge Identification by Using Signal Processing Techniques written by Tze Keong Chia and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Power Signal Processing Techniques for Radiometric Partial Discharge Detection in Wireless Sensor Network written by David Wilson Upton and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Reinforced Composites Recent Advances New Perspectives and Applications written by Longbiao Li and published by BoD – Books on Demand. This book was released on 2024-09-18 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber-reinforced composites have been widely applied in different industrial areas. This book focuses on the recent advances, new perspectives, and applications of different fiber-reinforced composites, such, as ceramic-matrix composites, fiber-reinforced concrete, wood–plastic composites, and so on. The design, fabrication, and application of fiber-reinforced composites are related to the high mechanical properties and nondestructive damage monitoring techniques. The experimental and damage monitoring method can reveal the internal damage evolution process inside of the fiber-reinforced composites and improve the operation reliability and safety of the composites and components. The book can help composite researchers better understand the engineering application, mechanical behavior, and damage detection of fiber-reinforced composites.
Download or read book Condition Monitoring Using Computational Intelligence Methods written by Tshilidzi Marwala and published by Springer Science & Business Media. This book was released on 2012-01-25 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condition Monitoring Using Computational Intelligence Methods promotes the various approaches gathered under the umbrella of computational intelligence to show how condition monitoring can be used to avoid equipment failures and lengthen its useful life, minimize downtime and reduce maintenance costs. The text introduces various signal-processing and pre-processing techniques, wavelets and principal component analysis, for example, together with their uses in condition monitoring and details the development of effective feature extraction techniques classified into frequency-, time-frequency- and time-domain analysis. Data generated by these techniques can then be used for condition classification employing tools such as: • fuzzy systems; rough and neuro-rough sets; neural and Bayesian networks;hidden Markov and Gaussian mixture models; and support vector machines.
Download or read book Advances in Acoustic Emission Technology written by Gongtian Shen and published by Springer. This book was released on 2019-06-04 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the papers from the World Conference on Acoustic Emission 2017 (WCAE-2017) in Xi'an, China. The latest research and applications of acoustic emission (AE) are explored, with a particular emphasis on detecting and processing AE signals, the development of AE instrument and testing standards, AE of materials, engineering structures and systems, including the processing of collected data and analytical techniques. Numerous case studies are also included. This proceedings volume will appeal to students, professors and researchers working in these fields as physicists and/or engineers.
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
