Download or read book Condition Assessment of Power Transformer Winding Insulation Based on Partial Discharge Detection written by Sally Daif and published by . This book was released on 2016 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power transformers are important components of power systems, as their failure can result in major losses to electric utilities. Transformer windings are responsible for approximately 30% of transformer failures. A principal cause of these failures is winding insulation failure due to partial discharge (PD). When PD occurs in power transformers, the insulation system is damaged in two ways: by gases created from the oil and paper, and by degradation of its solid insulation. Solid insulation degradation is correlated with the PD apparent charge value, which is usually measured by conventional PD detectors. However, conventional PD detectors are not suitable for use in a transformer environment due to noise interference and the transformer's complex internal design. In addition to PD apparent charge, identifying the nature of the PD is essential for assessing the transformer winding insulation condition. Due to the difficulties associated with PD measurement in a transformer environment, PD severity assessment is still performed by dissolved gas analysis, which does not provide enough details about the PD's crucial characteristics and hence the transformer insulation condition. To address these shortcomings, this research develops two distinct modules: PD detection and PD severity assessment. Using the leakage current measured at the transformer neutral, the detection module determines the PD charge, PD location, and PD source type in the transformer winding insulation. The severity assessment module then uses this information to assess the transformer winding insulation condition. In the PD detection module, the leakage current measured at the transformer neutral undergoes three modules: PD source classification, PD localization, and PD charge determination. The techniques used for PD source classification and localization are based on designing feedforward neural network classifiers using the statistical features extracted from leakage current signals, corresponding to different origins, sources or locations. The developed modules are tested on a three-phase transformer. The selection of the proper feature combination to in designing the neural networks results in better recognition of PD source type and location. In the PD charge determination module, the PD charge is calculated from the PD current injected into the transformer winding during a PD event, using both the corresponding leakage current and the winding transfer function. For the transformer under test, a bank of transfer functions from all possible locations along the winding to the transformer neutral is developed and used in the charge calculation module. The error between the measured and calculated charges is 10% or less. In the PD severity assessment module, a fuzzy logic system maps the PD characteristics, charge and source, into a quantitative index called the partial discharge index (PDI). Based on the damage caused to the insulation system by the PD charge and source, the PDI is used to classify the transformer condition into one of five categories: normal, questionable, harmed, critical, and dangerous. This PDI can also be used in transformer health index calculations.
Download or read book Recent Trends in the Condition Monitoring of Transformers written by Sivaji Chakravorti and published by Springer Science & Business Media. This book was released on 2013-10-21 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent Trends in the Condition Monitoring of Transformers reflects the current interest in replacing traditional techniques used in power transformer condition monitoring with non-invasive measures such as polarization/depolarization current measurement, recovery voltage measurement, frequency domain spectroscopy and frequency response analysis. The book stresses the importance of scrutinizing the condition of transformer insulation which may fail under present day conditions of intensive use with the resulting degradation of dielectric properties causing functional failure of the transformer. The text shows the reader how to overcome the key challenges facing today’s maintenance policies, namely: The selection of appropriate techniques for dealing with each type of failure process accounting for the needs of plant owners, plant users and wider society; and Cost-efficiency and durability of effect. Many of the failure-management methods presented rely on the fact that most failures give warning when they are imminent. These potential failures give rise to identifiable physical conditions and the novel approaches described detect them so that action can be taken to avoid degeneration into full-blown functional failure. This “on-condition” maintenance means that equipment can be left in service as long as a specified set of performance standards continue to be met, avoiding the costly downtime imposed by routine and perhaps unnecessary maintenance but without risking equally expensive failure. Recent Trends in the Condition Monitoring of Transformers will be of considerable interest to both academic researchers in power systems and to engineers working in the power generation and distribution industry showing how new and more efficient methods of fault diagnosis and condition management can increase transformer efficiency and cut costs.
Download or read book Power Transformer Diagnostics Monitoring and Design Features written by Issouf Fofana, Ph.D. ing. Chairholder and published by MDPI. This book was released on 2019-01-09 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Power Transformer Diagnostics, Monitoring and Design Features" that was published in Energies
Download or read book Condition Assessment of High Voltage Insulation in Power System Equipment written by R.E. James and published by IET. This book was released on 2008 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers major components of a high voltage system and the different insulating materials applied in equipment, identifying measurable materials suitable for condition assessment, and also analyses insulation fault scenarios that may occur in power equipment.
Download or read book Transformer Condition Control written by Vasily Ya. Ushakov and published by Springer Nature. This book was released on 2021-09-01 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to one of the main problems of modern electrical power engineering—power transformer diagnostics. The first three chapters discuss the fundamentals: The first chapter presents the physical reasons for power transformers’ failures and the technical and economic consequences of disruption of the normal operation. The second chapter reviews the standard technologies for monitoring the state of the high-voltage transformers. The third chapter tells about monitoring the condition of transformer windings based on the pulse method. The fourth chapter presents the technologies for transformer windings condition controlled by means of nanosecond pulses. The stages of improving the pulsed method based on a short probing pulse of the nanosecond range, the results of experiments on identifying the radial and axial displacements of the winding, studies of the effect of the duration and shape of the probing pulse on the sensitivity of the diagnostic procedure, and the stages of developing a mathematical as well as physical model of a power transformer are consistently presented.
Download or read book Quality Confirmation Tests for Power Transformer Insulation Systems written by Behrooz Vahidi and published by Springer. This book was released on 2019-05-27 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on oil-paper insulation included in power transformers, especially for EHV and UHV transformers. The importance on insulation ever increased due to a growing voltage rating of transformers. Within the last decades, although research on the transformer insulation and diagnosis methods has advanced a lot, the insulation of HV transformers remained more or less unchanged. The book is divided into five chapters; the first and second chapters explain the basics of oil insulation, while the third chapter focuses on paper insulation. The final two chapters deal with the methods and outcome of testing both techniques. The primary target audience for this book is graduate students and power system engineers.
Download or read book Power Transformer Condition Monitoring and Diagnosis written by Ahmed Abu-Siada and published by Institution of Engineering and Technology. This book was released on 2018-05-01 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power transformers are a key asset for electricity utilities around the globe. However, aging populations of large power transformers require reliable monitoring and diagnostics techniques to extend the asset's lifetime and minimise the possibility of catastrophic failure. This book describes the most popular power transformer condition monitoring techniques from principles to practice.
Download or read book Transformers written by and published by Reclamation Bureau. This book was released on 2005 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: On cover: Reclamation, Managing Water in the West. Describes how transformers work, how they are maintained, and how to test and evaluate their condition.
Download or read book Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence written by W.H. Tang and published by Springer Science & Business Media. This book was released on 2011-01-19 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, rapid changes and improvements have been witnessed in the field of transformer condition monitoring and assessment, especially with the advances in computational intelligence techniques. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence applies a broad range of computational intelligence techniques to deal with practical transformer operation problems. The approaches introduced are presented in a concise and flowing manner, tackling complex transformer modelling problems and uncertainties occurring in transformer fault diagnosis. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence covers both the fundamental theories and the most up-to-date research in this rapidly changing field. Many examples have been included that use real-world measurements and realistic operating scenarios of power transformers to fully illustrate the use of computational intelligence techniques for a variety of transformer modelling and fault diagnosis problems. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence is a useful book for professional engineers and postgraduate students. It also provides a firm foundation for advanced undergraduate students in power engineering.
Download or read book Transformer Ageing written by Tapan Kumar Saha and published by John Wiley & Sons. This book was released on 2017-06-01 with total page 479 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 Condition Monitoring of High Voltage Power Transformer Insulation Systems by Partial Discharge Measurement written by Justin R. Hyde and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Condition Assessment on Power Transformers using Dielectric Response Analysis written by Michael Raja Suriyah Jaya Soo Ria and published by Cuvillier Verlag. This book was released on 2014-02-14 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this PhD-thesis concentrated on improving existing dielectric response analysis methods for power transformers. A wholesome approach was pursued, leading to contributions in the measurement of the complex impedance spectra as well as in the modeling, analysis and in the subsequent moisture content estimation. The results of this work therefore allow for quicker dielectric response measurement and yet confident moisture estimation in the insulation system of a power transformer. The findings hence assist power utilities in their fleet management of power transformers within the confines of a risk-based asset management system.
Download or read book An Introduction to Electrical Transformer Testing written by J. Paul Guyer, P.E., R.A. and published by Guyer Partners. This book was released on 2019-06-14 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for electrical engineers and electric power system managers interested in testing of transformers. Here is what is discussed: 1. GENERAL 2. CORE INSULATION RESISTANCE AND INADVERTENT CORE GROUND TEST 3. DOBLE TESTS ON INSULATION 4. VISUAL INSPECTION 5. ULTRASONIC AND SONIC FAULT DETECTION 6. VIBRATION ANALYSIS 7. TURNS RATIO TEST 8. ESTIMATE OF PAPER DETERIORATION (ONLINE) 9. ESTIMATE OF PAPER DETERIORATION (OFFLINE DURING INTERNAL INSPECTION) 10. TRANSFORMER OPERATING HISTORY 11. TRANSFORMER DIAGNOSTICS/CONDITION ASSESSMENT SUMMARY
Download or read book Optical Sensing in Power Transformers written by Jun Jiang and published by John Wiley & Sons. This book was released on 2020-12-02 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: A cutting-edge, advanced level, exploration of optical sensing application in power transformers Optical Sensing in Power Transformers is filled with the critical information and knowledge on the optical techniques applied in power transformers, which are important and expensive components in the electric power system. Effective monitoring of systems has proven to decrease the transformer lifecycle cost and increase a high level of availability and reliability. It is commonly held that optical sensing techniques will play an increasingly significant role in online monitoring of power transformers. In this comprehensive text, the authors—noted experts on the topic—present a scholarly review of the various cutting-edge optical principles and methodologies adopted for online monitoring of power transformers. Grounded in the authors' extensive research, the book examines optical techniques and high-voltage equipment testing and provides the foundation for further application, prototype, and manufacturing. The book explores the principles, installation, operation, condition detection, monitoring, and fault diagnosis of power transformers. This important text: Provides a current exploration of optical sensing application in power transformers Examines the critical balance and pros and cons of cost and quality of various optical condition monitoring techniques Presents a wide selection of techniques with appropriate technical background Extends the vision of condition monitoring testing and analysis Treats condition monitoring testing and analysis tools together in a coherent framework Written for researchers, technical research and development personnel, manufacturers, and frontline engineers, Optical Sensing in Power Transformers offers an up-to-date review of the most recent developments of optical sensing application in power transformers.
Download or read book Electromagnetic Transients in Transformer and Rotating Machine Windings written by Su, Charles Q. and published by IGI Global. This book was released on 2012-07-31 with total page 587 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book explores relevant theoretical frameworks, the latest empirical research findings, and industry-approved techniques in this field of electromagnetic transient phenomena"--Provided by publisher.
Download or read book Electrical Insulation for Rotating Machines written by Greg C. Stone and published by John Wiley & Sons. This book was released on 2014-07-02 with total page 685 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fully expanded new edition documenting the significant improvements that have been made to the tests and monitors of electrical insulation systems Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair, Second Edition covers all aspects in the design, deterioration, testing, and repair of the electrical insulation used in motors and generators of all ratings greater than fractional horsepower size. It discusses both rotor and stator windings; gives a historical overview of machine insulation design; and describes the materials and manufacturing methods of the rotor and stator winding insulation systems in current use (while covering systems made over fifty years ago). It covers how to select the insulation systems for use in new machines, and explains over thirty different rotor and stator winding failure processes, including the methods to repair, or least slow down, each process. Finally, it reviews the theoretical basis, practical application, and interpretation of forty different tests and monitors that are used to assess winding insulation condition, thereby helping machine users avoid unnecessary machine failures and reduce maintenance costs. Electrical Insulation for Rotating Machines: Documents the large array of machine electrical failure mechanisms, repair methods, and test techniques that are currently available Educates owners of machines as well as repair shops on the different failure processes and shows them how to fix or otherwise ameliorate them Offers chapters on testing, monitoring, and maintenance strategies that assist in educating machine users and repair shops on the tests needed for specific situations and how to minimize motor and generator maintenance costs Captures the state of both the present and past “art” in rotating machine insulation system design and manufacture, which helps designers learn from the knowledge acquired by previous generations An ideal read for researchers, developers, and manufacturers of electrical insulating materials for machines, Electrical Insulation for Rotating Machines will also benefit designers of motors and generators who must select and apply electrical insulation in machines.
Download or read book Power Transformer Online Monitoring Using Electromagnetic Waves written by Gevork B. Gharehpetian and published by Academic Press. This book was released on 2023-02-09 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power Transformer Online Monitoring using Electromagnetic Waves explores how to use electromagnetic wave technology and remote monitoring systems to predict and localize costly mechanical defects and partial discharge challenges in high voltage transformer windings. This innovative approach brings several potential benefits compared with conventional techniques such as frequency response analysis, including impermeability to ambient noise, and online implementation capability. This book reviews both fundamental and state-of-the-art information about all key aspects of condition monitoring using electromagnetic waves. It addresses the simulation of power transformers in CST environment while also explaining the theoretical background of boundary conditions used. Chapters review how to achieve practical online implementation, reliable diagnosis, asset management and remnant life estimation. Partial discharge detection is also discussed. - Discusses the advantages and disadvantages of the electromagnetic wave method in comparison with classical monitoring methods - Explores how to design and implement power transformer monitoring systems using electromagnetic waves - Investigates partial discharge detection and localization in addition to the partial discharge emission effects on defect detection
