Power Transformer Online Monitoring Using Electromagnetic Waves

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Power Transformer Online Monitoring Using Electromagnetic Waves

Author : Gevork B. Gharehpetian
Publisher : Academic Press
ISBN 13 : 0128228024
Total Pages : 338 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Power Transformer Online Monitoring Using Electromagnetic Waves by : Gevork B. Gharehpetian

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

Measurement of Partial Discharges in Power Transformers using Electromagnetic Signals

Author : Sebastian Coenen
Publisher : BoD – Books on Demand
ISBN 13 : 3844896139
Total Pages : 162 pages
Book Rating : 4.8/5 (448 download)

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Book Synopsis Measurement of Partial Discharges in Power Transformers using Electromagnetic Signals by : Sebastian Coenen

Download or read book Measurement of Partial Discharges in Power Transformers using Electromagnetic Signals written by Sebastian Coenen and published by BoD – Books on Demand. This book was released on 2012-08-17 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Partial discharges within power transformers emit electromagnetic waves. The current thesis aims to provide fundamental knowledge about measuring and interpretation of the electromagnetic signals. Investigations in laboratory are confirmed by several case studies. The applicability using electromagnetic signals for partial discharge measurements on transformer in the field is demonstrated under real test conditions.

Optical Sensing in Power Transformers

Author : Jun Jiang
Publisher : John Wiley & Sons
ISBN 13 : 1119765293
Total Pages : 256 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Optical Sensing in Power Transformers by : Jun Jiang

Download or read book Optical Sensing in Power Transformers written by Jun Jiang and published by John Wiley & Sons. This book was released on 2020-12-07 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.

Calibration Methods for Reproducible and Comparable Electromagnetic Partial Discharge Measurements in Power Transformers

Author : Martin Siegel
Publisher : BoD – Books on Demand
ISBN 13 : 3752628189
Total Pages : 130 pages
Book Rating : 4.7/5 (526 download)

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Book Synopsis Calibration Methods for Reproducible and Comparable Electromagnetic Partial Discharge Measurements in Power Transformers by : Martin Siegel

Download or read book Calibration Methods for Reproducible and Comparable Electromagnetic Partial Discharge Measurements in Power Transformers written by Martin Siegel and published by BoD – Books on Demand. This book was released on 2020-11-20 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reliability of electrical energy networks depends on the quality and availability of their electrical equipment, e.g., power transformers. Local failures inside their insulation can lead to breakdowns resulting in high outage and penalty costs. To prevent these destructive events, power transformers are tested for partial discharge (PD) activity in a routine test before shipment. Furthermore, PD activity can be evaluated as a diagnostic measurement on-site (on-line or off-line) or be constantly monitored during service using the ultra-high frequency (UHF) method. In this thesis, a calibration procedure is proposed for the UHF method used in power transformers, which is lacking so far. The calibration process is required to ensure both reproducibility and comparability of UHF measurements. Only a calibrated UHF measurement procedure can be deemed reliable and eventually be introduced to supplement in (site-)acceptance tests of power transformers. The proposed calibration method considers two factors: The influence of the UHF sensors' sensitivity and that of the UHF instrument characteristics, including accessories like cables, pre-amplifier, etc. The UHF instruments' influence is corrected by using a defined and invariable test signal as a reference for all recording devices comparable to the calibration method used in IEC 60270 for electrical PD measurement. The sensitivity of the UHF sensor is addressed by a characterization of UHF sensors using the antenna factor (AF) measured in a special reproducible setup, i.e., a GTEM cell. In this thesis, a self-built GTEM cell is presented, which is oil-filled to address the environmental conditions inside a transformer where the sensor will be used. With such a cell, influences on the AF of UHF sensors are investigated, and it is shown that sensor sensitivities measured in an air-filled cell can be corrected to the oil environment. A practical evaluation of the proposed calibration procedure is performed in a laboratory setup on a distribution transformer with different UHF instruments and sensors using artificial PD signals and real high voltage driven PD sources. Finally, this thesis identifies future research topics, which may be needed to improve the proposed UHF calibration procedure for power transformers and the UHF method in general.

Optical Sensing in Power Transformers

Author : Jun Jiang
Publisher : John Wiley & Sons
ISBN 13 : 1119765285
Total Pages : 256 pages
Book Rating : 4.1/5 (197 download)

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Book Synopsis Optical Sensing in Power Transformers by : Jun Jiang

Download or read book Optical Sensing in Power Transformers written by Jun Jiang and published by John Wiley & Sons. This book was released on 2020-12-14 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.

Power Transformer Diagnostics, Monitoring and Design Features

Author : Issouf Fofana, Ph.D. ing. Chairholder
Publisher : MDPI
ISBN 13 : 3038974412
Total Pages : 255 pages
Book Rating : 4.0/5 (389 download)

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Book Synopsis Power Transformer Diagnostics, Monitoring and Design Features by : Issouf Fofana, Ph.D. ing. Chairholder

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

Electromagnetic Transients in Transformer and Rotating Machine Windings

Author : Su, Charles Q.
Publisher : IGI Global
ISBN 13 : 1466619228
Total Pages : 587 pages
Book Rating : 4.4/5 (666 download)

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Book Synopsis Electromagnetic Transients in Transformer and Rotating Machine Windings by : Su, Charles Q.

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.

Optimisation of Online Condition Monitoring to Predict Power Transformer Failures in Distribution Networks

Author : Thabang Abel Motau
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (131 download)

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Book Synopsis Optimisation of Online Condition Monitoring to Predict Power Transformer Failures in Distribution Networks by : Thabang Abel Motau

Download or read book Optimisation of Online Condition Monitoring to Predict Power Transformer Failures in Distribution Networks written by Thabang Abel Motau and published by . This book was released on 2019 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stability of any distribution network is very much dependant on the performance of the power transformers. These transformers need to be monitored to ensure that any unwanted conditions, including high risk defects, are detected. The previous and current transformer failures in the Northern Cape Operating Unit show that the health status in the Plant Health Indicator of the transformers was on category A. Category A status means the transformers were healthy. The root causes of failure were that only some of the Dissolved Gas Analysis parameters were monitored. The transformers were shown to be healthy by the Plant Health Indicator at the time of the failure. Parameters such as cooling, bushings, tap changers, operating temperatures, ageing and loss of life were not monitored. The majority of transformer failures recorded were affected by the parameters mentioned above, of which some are not monitored in the Plant Health Indicator. This research study discusses the application of integrated online condition monitoring for power transformers as one of the techniques to assess the condition of the power transformer during operation. The integrated online condition monitoring allows for transformer condition assessment without having to switch off the transformer, thereby minimising power supply interruptions. The integrated online condition monitoring system is unique technology that monitors the condition of various parameters of the power transformer such as the cooling fans, on-load tap changer, bushings, transformer operating temperatures, dissolved gas analysis, transformer ageing and loss of life. The research design is quantitative with data analysis retrieved directly from the online condition monitoring server. The results from the bushings, cooling fans, tap changer and temperatures form part of the analysis. Data analysis lead to a discussion of these parameters, which highlights the problems currently experienced with transformer failures in the Northern Cape Operating Unit. The research study revealed that, although Eskom is having the best maintenance practices in power transformers, there is a need to improve and save costs, as the current maintenance strategies of power transformers are expensive. The results of the study should be regarded as exploratory, and provide directions to researchers for further, more in-depth studies in this field. The cost analysis was performed over a period of ten years, as compared to the current costs of maintenance/monitoring and asset replacement strategies of power transformers. The total saving per year was a great benefit for tasks such as inspections/maintenance/monitoring and asset replacement. This was validated by the results from the proposed transformer online monitoring technology that can predict the defects which may result in catastrophic transformer failures.

Electromagnetic Analysis and Condition Monitoring of Synchronous Generators

Author : Hossein Ehya
Publisher : John Wiley & Sons
ISBN 13 : 1119636167
Total Pages : 708 pages
Book Rating : 4.1/5 (196 download)

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Book Synopsis Electromagnetic Analysis and Condition Monitoring of Synchronous Generators by : Hossein Ehya

Download or read book Electromagnetic Analysis and Condition Monitoring of Synchronous Generators written by Hossein Ehya and published by John Wiley & Sons. This book was released on 2022-12-06 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electromagnetic Analysis and Condition Monitoring of Synchronous Generators Discover an insightful and complete overview of electromagnetic analysis and fault diagnosis in large synchronous generators In Electromagnetic Analysis and Condition Monitoring of Synchronous Generators, a team of distinguished engineers delivers a comprehensive review of the electromagnetic analysis and fault diagnosis of synchronous generators. Beginning with an introduction to several types of synchronous machine structures, the authors move on to the most common faults found in synchronous generators and their impacts on performance. The book includes coverage of different modeling tools, including the finite element method, winding function, and magnetic equivalent circuit, as well as various types of health monitoring systems focusing on the magnetic field, voltage, current, shaft flux, and vibration. Finally, Electromagnetic Analysis and Condition Monitoring of Synchronous Generators covers signal processing tools that can help identify hidden patterns caused by faults and machine learning tools enabling automated condition monitoring. The book also includes: A thorough introduction to condition monitoring in electric machines and its importance to synchronous generators Comprehensive explorations of the classification of synchronous generators, including armature arrangement, machine construction, and applications Practical discussions of different types of electrical and mechanical faults in synchronous generators, including short circuit faults, eccentricity faults, misalignment, core-related faults, and broken damper bar faults In-depth examinations of the modeling of healthy and faulty synchronous generators, including analytical and numerical methods Perfect for engineers working in electrical machine analysis, maintenance, and fault detection, Electromagnetic Analysis and Condition Monitoring of Synchronous Generators is also an indispensable resource for professors and students in electrical power engineering.

Electromagnetic Transient Analysis and Novel Protective Relaying Techniques for Power Transformers

Author : Xiangning Lin
Publisher : John Wiley & Sons
ISBN 13 : 111865384X
Total Pages : 320 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis Electromagnetic Transient Analysis and Novel Protective Relaying Techniques for Power Transformers by : Xiangning Lin

Download or read book Electromagnetic Transient Analysis and Novel Protective Relaying Techniques for Power Transformers written by Xiangning Lin and published by John Wiley & Sons. This book was released on 2014-11-14 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced level examination of the latest developments in power transformer protection This book addresses the technical challenges of transformer malfunction analysis as well as protection. One of the current research directions is the malfunction mechanism analysis due to nonlinearity of transformer core and comprehensive countermeasures on improving the performance of transformer differential protection. Here, the authors summarize their research outcomes and present a set of recent research advances in the electromagnetic transient analysis, the application on power transformer protections, and present a more systematic investigation and review in this field. This research area is still progressing, especially with the fast development of Smart Grid. This book is an important addition to the literature and will enhance significant advancement in research. It is a good reference book for researchers in power transformer protection research and a good text book for graduate and undergraduate students in electrical engineering. Chapter headings include: Transformer differential protection principle and existing problem analysis; Malfunction mechanism analysis due to nonlinearity of transformer core; Novel analysis tools on operating characteristics of Transformer differential protection; Novel magnetizing inrush identification schemes; Comprehensive countermeasures on improving the performance of transformer differential protection An advanced level examination of the latest developments in power transformer protection Presents a new and systematic view of power transformer protection, enabling readers to design new models and consider fresher design approaches Offers a set of approaches to optimize the power system from a microeconomic point of view

Advances in 3D Image and Graphics Representation, Analysis, Computing and Information Technology

Author : Roumen Kountchev
Publisher : Springer Nature
ISBN 13 : 9811538670
Total Pages : 512 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis Advances in 3D Image and Graphics Representation, Analysis, Computing and Information Technology by : Roumen Kountchev

Download or read book Advances in 3D Image and Graphics Representation, Analysis, Computing and Information Technology written by Roumen Kountchev and published by Springer Nature. This book was released on 2020-04-20 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers presented at the conference “Advances in 3D Image and Graphics Representation, Analysis, Computing and Information Technology,” one of the first initiatives devoted to the problems of 3D imaging in all contemporary scientific and application areas. The aim of the conference was to establish a platform for experts to combine their efforts and share their ideas in the related areas in order to promote and accelerate future development. This second volume discusses algorithms and applications, focusing mainly on the following topics: 3D printing technologies; naked, dynamic and auxiliary 3D displays; VR/AR/MR devices; VR camera technologies; microprocessors for 3D data processing; advanced 3D computing systems; 3D data-storage technologies; 3D data networks and technologies; 3D data intelligent processing; 3D data cryptography and security; 3D visual quality estimation and measurement; and 3D decision support and information systems.

Recent Trends in the Condition Monitoring of Transformers

Author : Sivaji Chakravorti
Publisher : Springer Science & Business Media
ISBN 13 : 1447155505
Total Pages : 289 pages
Book Rating : 4.4/5 (471 download)

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Book Synopsis Recent Trends in the Condition Monitoring of Transformers by : Sivaji Chakravorti

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.

Application of Intelligent Systems in Multi-modal Information Analytics

Author : Vijayan Sugumaran
Publisher : Springer Nature
ISBN 13 : 3031054849
Total Pages : 1132 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Application of Intelligent Systems in Multi-modal Information Analytics by : Vijayan Sugumaran

Download or read book Application of Intelligent Systems in Multi-modal Information Analytics written by Vijayan Sugumaran and published by Springer Nature. This book was released on 2022-06-13 with total page 1132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive coverage of the latest advances and trends in information technology, science and engineering. Specifically, it addresses a number of broad themes, including multi-modal informatics, data mining, agent-based and multi-agent systems for health and education informatics, which inspire the development of intelligent information technologies. The book covers a wide range of topics such as AI applications and innovations in health and education informatics; data and knowledge management; multi-modal application management; and web/social media mining for multi-modal informatics. Outlining promising future research directions, the book is a valuable resource for students, researchers and professionals and a useful reference guide for newcomers to the field. This book is a compilation of the papers presented in the 4th International Conference on Multi-modal Information Analytics, held online, on April 23, 2022.

Foundations and Frontiers in Computer, Communication and Electrical Engineering

Author : Aritra Acharyya
Publisher : CRC Press
ISBN 13 : 1315657910
Total Pages : 564 pages
Book Rating : 4.3/5 (156 download)

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Book Synopsis Foundations and Frontiers in Computer, Communication and Electrical Engineering by : Aritra Acharyya

Download or read book Foundations and Frontiers in Computer, Communication and Electrical Engineering written by Aritra Acharyya and published by CRC Press. This book was released on 2016-05-05 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 3rd International Conference on Foundations and Frontiers in Computer, Communication and Electrical Engineering is a notable event which brings together academia, researchers, engineers and students in the fields of Electronics and Communication, Computer and Electrical Engineering making the conference a perfect platform to share experience, f

Proceedings of the 21st International Symposium on High Voltage Engineering

Author : Bálint Németh
Publisher : Springer Nature
ISBN 13 : 3030316769
Total Pages : 1569 pages
Book Rating : 4.0/5 (33 download)

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Book Synopsis Proceedings of the 21st International Symposium on High Voltage Engineering by : Bálint Németh

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.

Power Transformer Condition Monitoring and Diagnosis

Author : Ahmed Abu-Siada
Publisher : Energy Engineering
ISBN 13 : 1785612549
Total Pages : 325 pages
Book Rating : 4.7/5 (856 download)

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Book Synopsis Power Transformer Condition Monitoring and Diagnosis by : Ahmed Abu-Siada

Download or read book Power Transformer Condition Monitoring and Diagnosis written by Ahmed Abu-Siada and published by Energy Engineering. This book was released on 2018-01-31 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This must-read book on power transformer monitoring will incorporate current power transformer condition monitoring techniques from principles to practice. Each chapter will cover the fundamentals and theory of the topic, convey techniques to measure relevant parameters, and assess or interpret the results. The book will include factory acceptance tests, receiving end pre-commissioning tests, and commissioning tests. It will also include the limitations and challenges, and approaches to overcome these limitations.

Transformer Vibration and Its Application to Condition Monitoring

Author : Yuxing Wang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Transformer Vibration and Its Application to Condition Monitoring by : Yuxing Wang

Download or read book Transformer Vibration and Its Application to Condition Monitoring written by Yuxing Wang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrical power is an important part of daily life and a necessity for the development of modern industry. The dependency of a country's economic development on electrical power is growing rapidly. Consequently, planning, designing, constructing, and maintaining power delivery systems must keep pace with the escalating demand of such development. Power transformers are a key component of a power transmission system, and condition monitoring and failure diagnosis techniques are commonly required by transformer owners for reliability and maintenance purposes. Despite several decades of research into transformer vibration and condition monitoring techniques, state-of-the-art development in this area still falls short in the understanding of the mechanisms involved and in industry implementation. The objective of this thesis therefore is to investigate the vibration characteristics of a power transformer with and without structural damage and to develop a vibration-based transformer condition monitoring technique. It is hoped that this work could give a better understanding of transformer vibration and its application to condition monitoring. To that end, several aspects of transformer vibration are studied experimentally and numerically, including its excitation forces, modal characteristics, and vibration frequency responses. The finite element (FE) method is employed as the main approach for numerical analysis of the aforementioned aspects. The effect of the arrangement of ferromagnetic parts on the modelling of winding electromagnetic (EM) forces is discussed in detail with the purpose of improving its modelling accuracy. Special considerations, i.e., the anisotropic mechanical properties of core lamination, of transformer vibration modelling are summarised based on the traditional experimental modal analysis. Vibration features of a transformer with structural anomalies, especially with cases of winding failure, are investigated using a verified FE model. In addition, the frequency response function and its variations caused by structural anomalies are studied experimentally under both mechanical and electrical excitations. It is shown that a structural anomaly will produce shifts in the natural frequency and changes in the vibration response. The experimental results also demonstrate that the transformer mechanical resonance can be excited by internal electrical excitations, which enables operational modal analysis (OMA) and OMA-based online monitoring. An algorithm based on the time-domain NExt/ITD method is employed as an OMA technique to identify transformer modal parameters. The features of transformer vibration and operational conditions are considered in the proposed algorithm, which improves the identification accuracy in some cases. The identification method is also applied to the same transformer with core and winding anomalies. Results show that the OMA method is capable of identifying transformer modal parameters and thus can be utilised for online condition monitoring.