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"Kerusakan transformator dapat diakibatkan oleh berbagai gangguan, misalnya sambaran petir, surja hubung, gangguan antar lilitan, hubung singkat, beban lebih, gangguan inti dan kebocoran tangki. Dekomposisi minyak trafo yang disebabkan panas atau tekanan listrik, akan menghasilkan bermacam gas dengan kadar berbeda-beda untuk masing-masing gangguan sehingga dapat dianalisis. Disamping menyebabkan dekomposisi minyak trafo, gangguan-gangguan tersebut di atas juga akan menyebabkan kerusakan mekanis pada bagian-bagian transformator yang mengalami gangguan. Tesis ini membahas mengenai penyebab kerusakan transformator dengan cara melakukan analisis terhadap kandungan gas yang mudah terbakar dalam minyak trafo, data beban harian dan data kerusakan fisik transfonnator.

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Transformer damages are caused by several kinds of disturbances, such as short circuits, lightning strikes, switchings, core faults, interturn faults, overloads and tank faults. Decomposition into gasses of transformer oil caused by heat and electric stress can be analyzed because gas contents differs for each disturbance. Besides decomposition of transformer oil the disturbances will also cause mechanical damages on the parts of the disturbed transfonner. This these is discussing transformer damages caused, by analyzing the content of combustible gases in transformer oil, dayly load data and physical damages of transformer."

"This book presents current research trends in the field of underwater acoustic wave direct and inverse problems. Until very recently, little has been published concerning model-based inversions of the boundaries and material constants of finite-sized targets located either in the water column or the sediments. This text is the first to investigate inverse problems in an ocean environment with a heavy emphasis placed on the description and resolution of the forward scattering problem.Marine Acoustics: Direct and Inverse Problems emphasizes computation of Green's Functions with new material added for elastic and poro-elastic seabeds. This timely publication addresses many areas of practical interest in connection with underwater acoustical imaging including ecological survey and clean up, protection of open water harbors, offshore petroleum and gas enterprises, as well as environmental and military uses. The ocean-seabed system is an acoustic waveguide and this is the only book that treats inverse problems in a waveguide. The propagation of acoustic waves in this system is treated for various types of seabeds and the direct and inverse problems are considered in realistic ocean environments. The inverse problem is to determine the shape of an impenetrable or penetrable object, or to determine the coefficients describing the seabed. This is done by acoustically illuminating the seabed and investigating the scattered field."