Tutorials

Tutorial-1, Speaker: Yasuhiro Tanaka, Professor of Tokyo City University, Japan.:

About the Speaker:  Yasuhiro TANAKA was born in Fukuoka, Japan in 1961. He received the B.E., M.E. and Ph.D. degrees in electrical engineering from Waseda University, Japan, in 1986, 1988 and 1991, respectively. He became a Lecturer, an Associate Professor and a Professor at Tokyo City University, in 1992, 1998 and 2004, respectively. He was a Visiting Scientist at University of Southampton from 1999 to 2000. He received the Excellent Paper Award from the IEE of Japan in 2009 and he received the IEC1906 award in 2013. Currently, he is researching and developing the measurement system for the space charge distribution in various solid dielectric materials at high temperature, under ultra-high electric field or under irradiation of gamma-ray or electron-beam in vacuum. He is a member of CIGRE SC D1, and he is also IEEE DEIS Society Administrative Committee Members-at- large (2015-2017), and a convener of IEC TC 112 WG8.

Topic: Space Charge Accumulation in Insulating Materials for HVDC observed using PEA Method

Abstract: Space charge accumulation is one of important factor to understand when an insulating system for HVDC is designed. The Pulsed Electro-Acoustic (PEA) method is widely used for measuring the space charge distribution in the insulating materials. In this lecture, the principle of the method and some typical measurement results are introduced.

Tutorial-2, Speaker: Professor Ayman Hassan El-Hag, American University of Sharjah.:

About the Speaker:  Dr. Ayman El-Hag received his B.S. and M.S. degree from King Fahd University of Petroleum and Minerals and his PhD from the University of Waterloo in 1993, 1998 and 2003 respectively. He joined the Saudi Transformer Co. as a Quality Control Engineer from 1993 till 1999. From January till June 2004, Dr. El Hag worked as a Postdoctoral fellow at the University of Waterloo then he joined the University of Toronto as a Postdoctoral fellow from July 2004 till July 2006. Currently Dr. El-Hag is a professor in the electrical engineering department at the American University of Sharjah. Also, Dr. El-Hag is an adjunct professor at the University of Waterloo. He is the Middle-East Regional Editor of the IEEE DEIS Electrical Insulation Magazine and a member of the IEEE DEIS Outdoor Insulation Technical Committee. Dr. El-Hag main areas of interest are condition monitoring and diagnostics of electrical insulation and pulse power applications in biological systems.

Topic: Smart Monitoring of Outdoor Insulators

Abstract: Outdoor insulators are crucial elements to the overall reliability of the power system. Most of the failures of overhead lines are due to outdoor insulators internal or external failures. Hence development of new and efficient techniques to detect outdoor insulators failures is important to the utility engineers. Moreover, combing the currently developed artificial intelligent and signal processing techniques with existing classical condition monitoring practices can significantly improve the overall outdoor insulators condition monitoring process. In this tutorial the use of different sensors and artificial intelligent techniques to detect different forms of damages for both ceramic and non-ceramic insulators will be discussed. Examples of the used sensors are: near field microwave waveguide, RF antenna, acoustic sensor and regular camera. The use of these sensors to detect internal and external defects, estimate the pollution level and assess the insulator surface conditions will be addressed. Also, applying the artificial intelligent techniques from feature extraction to the application of the proper classifiers to automate the outdoor insulator inspection process will be highlighted.

Tutorial-3, Speaker: Professor S. V. Kulkarni, Indian Institute of Technology Bombay.:

About the Speaker:  S.V. Kulkarni is Professor in the Electrical Engineering Department, Indian Institute of Technology, Bombay, India. Previously, he was with Crompton Greaves Ltd. and specialized in the design and development of transformers up to the 400-kV class. He has authored a book Transformer Engineering: Design, Technology, and Diagnostics (CRC/Taylor & Francis). He is the author of many professional publications in reputed journals and conferences. His research interests include analysis and diagnostics of power transformers, computational electromagnetics, and distributed generation. Prof. Kulkarni is a recipient of the Young Engineer Award from Indian National Academy of Engineering. He also received the Career Award for Young Teachers from All India Council for Technical Education. He is a Fellow of the Indian National Academy of Engineering. Field Computation Laboratory and Insulation Diagnostics Laboratory have been established by him in his department.

Topic: Modeling of transformers for diagnostic and transient studies

Abstract: A power transformer has three main components: magnetic circuit, windings and insulation system. Accurate representation of these components is of paramount importance while modeling transformers for diagnostic and transient studies. This tutorial, to start with, summarizes different modes of failures, aging and deterioration, and identifies current/emerging diagnostic techniques for detecting these phenomena. The current state-of- the-art for modeling the three components is then enumerated. Calculation of parameters of the core and windings as a function of frequency is a challenging task. It is important to understand and incorporate the following concepts in many investigative studies: a) skin and proximity effects in windings, b) core characteristics including hysteretic, anisotropic and dynamic behaviour, c) complex permeability and permittivity. Transient studies involving transformers may also need such elaborate modeling efforts for obtaining meaningful results. Finally, numerical techniques useful in such studies are highlighted with comments on their advantages and limitations.

Tutorial-4, Speaker: Dr. Subrat Kumar Sahoo, ABB, Sweden.:

About the Speaker:  Dr. Subrat Sahoo was born in 1979 in India. He completed his Masters and PhD from Indian Institute of Science, Bangalore in 2008 in the areas of Failure detection and diagnostics of large power transformer. He joined GE Global Research in Bangalore as a researcher in 2007 and developed next generation algorithms for fault prediction and prognostics of steam turbine generators and gas turbines. He also worked on remote diagnostics of balance of plant. He is with ABB corporate research in Sweden since 2011, where he is currently working as a senior scientist in the areas of rotating machine and power system diagnostics. He is developing multi generation platform for future proof smart systems for transformers and other components of substation.

Dr. Sahoo has authored and co-authored six journal and eight conference papers in various international journals and conferences and certain other communications are awaited. He has eight Patents citing the ingenuity of his skills. He collaborates with different universities in Europe and also with some IITs in India. He writes blogs in his free time and keep himself updated on current affairs and loves travelling and reading human minds.

Topic: Asset management in a renewable world: challenges and opportunities

Abstract: The energy utility landscape is witnessing overwhelming changes across the globe, lately turning more customer centric. The political and economic dynamics in favor of carbon neutral measures, wide legislations by government bodies for accommodating distributed renewable energy sources is gradually abating the natural monopoly the utilities once used to enjoy; thus all the more empowering the end-customers. In a bid to survive and stay afloat in the era of hyper-competition, the utility and transmission system operator (TSO) world is focusing more on curtailing the operational expenditures (OPEX), optimize the capital expenses (CAPEX) and still run the business profitable. The efforts carried out in the process should also be sustainable so that it does not die during or after major technological or economic reforms.

Countless initiatives by the utility operators in different countries are being undertaken that is aimed at driving economic growth through asset management, renewable integration and capacity planning. Innovation still holds the key not just by the technological breakthroughs, but also through different business models that creates an enabling ecosystem both for the consumers and the service providers.

The emergence of fourth industrial revolution is shifting focus towards digitalization, cloud computing, big data analytics, internet of things and related topics. In the utility environment, a lot of smart interconnecting devices are being introduced for utilization benefits and improved user experience. However, most of these devices have different reliability requirements, application areas, mode of usage (continuous/intermittent), ease of operation, time criticality, volatility of operation etc.

The tutorial will touch upon some major drivers that would govern the changing equations in power and energy systems context. Asset management being a tricky proposition, where the asset performance is balanced against shareholders expectation. Reliability assessment, availability management are two corner stones for a healthy asset upkeep strategy, while maximizing the earnings. The proactive maintenance is becoming the norm, compared to reactive and predictive maintenance of the past. Availability of more data from the asset offers intelligent analytics opportunities and define more sense from the interconnected assets and comparing their performance over a fleet level. The volatility of some of these options would create fresh challenges and opportunities that will dictate the survival of the fittest vis-a-vis economic performance of assets and sensible investment strategies.

Tutorial-5, Speaker: Santanu Singha, ABB, Sweden

About the Speaker:  Dr. Santanu Singha was born and educated in India. He is an Electrical Engineer and he received his Masters and Ph.D. degrees from the Indian Institute of Science, Bangalore, India in 2000 and 2009 respectively. Since 2009, he has been working as a researcher on Materials Technology at ABB Corporate Research in Vasteras, Sweden and currently, he is the Research Team Manager of the Insulation and Materials Technology Team. His research interests are in the area of new functional materials for electrical insulation applications, alternative liquid insulation and systems, nanodielectrics, design of electrical insulation systems for HV apparatus and novel manufacturing methods. He is a Senior Member of the IEEE Dielectrics and Electrical Insulation Society and a Member of CIGRE.

Topic: Recent trends in electrically insulating liquids and their application related challenges

Abstract: This tutorial will try to make the audience aware of the latest trends with respect to transformer insulating liquids with special emphasis on esters and isoparaffins. Different possibilities of liquid formulations (with different properties) within the ester family of liquids will be presented and the challenges associated with the design of transformers with the new properties of these liquids will be discussed. Although transformer diagnostic criteria for these new liquids are not properly formulated in the standards, the tutorial will touch upon the important aging characteristics that are highly relevant for the user to understand and accordingly make the right decision.