LIBROS
May, 2018 published by the IET
POWER TRANSFORMER CONDITION MONITORING AND DIAGNOSIS: CONCEPTS AND CHALLENGES
Ricardo Albarracín
Department of Electrical, Electronic and Automation Engineering and Applied Physics
Universidad Politécnica de Madrid, Spain
Guillermo Robles
Department of Electrical Engineering
University Carlos III of Madrid, Spain
Jorge Alfredo Ardila-Rey
Department of Electrical Engineering
University Federico Santa María, Chile
Andrea Cavallini
Department of Electrical Engineering
University of Bologna, Italy
Renzo Passaglia
Former consultant at CESI S.p.A. now retired, Italy
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. Topics covered include concepts and challenges in power transformer condition monitoring and diagnosis; dissolved gas analysis, measurements and interpretations; moisture analysis for power transformers; assessing degree of polymerisation value considering thermal ageing and paper moisture; frequency response analysis; monitoring of power transformers by mechanical oscillations; lifecycle management of power transformers in a new energy era; and other topics in power transformer asset management and remnant life. Each chapter covers the fundamentals and theory of the topic, and conveys techniques to measure relevant parameters and assess or interpret the results.
May, 2017 published by INTECH
ELECTRICAL PROPERTIES OF DIFFERENT POLYMERIC MATERIALS AND THEIR APPLICATIONS: THE INFLUENCE OF ELECTRIC FIELD
Sk Manirul Haque
Jubail Industrial College - Chemical Engineering
Saudi Arabia
Jorge Alfredo Ardila-Rey
Department of Electrical Engineering
University Federico Santa María, Chile
Abdullahi Abubakar Masúd
Jubail Industrial College - Electrical and Electronic Engineering Technology
Saudi Arabia
Yunusa Umar
Jubail Industrial College
Ricardo Albarracín
Department of Electrical, Electronic and Automation Engineering and Applied Physics
Universidad Politécnica de Madrid, Spain
In this chapter, a comprehensive study on the general structure of polymers, their properties and applications has been carried out. In particular, the application of polymers for insulating high‐voltage (HV) equipment has been reported, together with the effect
of electric field when they are subjected to HV stress. Experimental results related to the effect of partial discharge (PD) on polymeric insulations have been reported and discussed. Practical implications of the results have been discussed, and recommendations are made for future improvement. It is important to obtain new information regardingnovel polymeric materials such as nano‐polymers that can possibly outperform the currentlyused ones. It is also vital to investigate the right information for electrical equipment,i.e. by using the appropriate polymer as solid insulation, minimizing the presenceof any metallic sharp object and any other conducting path during manufacture in order to avoid any type of internal or external PD