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A fast, non-destructive, and accurate technique has been introduced more than 30 years ago and industrialized since the last decade to recognize the transformer mechanical defect. This method called Frequency Response Analysis (FRA) and implemented as an off-line technique. Nowadays, transformer researchers as well as experts showing significant interest in real-time application of diagnosis methods...
Frequency Response Analysis (FRA) has been in use since the last decade as a sensitive method for detecting transformer internal defects. This study is focused on the influence of temperature and moisture migration on the FRA response of transformer winding. It also discusses the feasibility of FRA capability in moisture diffusion recognition in transformer paper insulation. To conduct this study,...
Frequency Response Analysis (FRA) has been in use since the last decade as a sensitive method in transformer internal defect recognition. This study has concentrated on the influence of transformer winding dry-out process on FRA spectrum. A single phase glassy model transformer involving concentric LV and HV windings is fabricated and taken as a test object. FRA traces for HV and LV windings of the...
Frequency Response Analysis (FRA) has been operated since last decade as a sensitive method in transformer internal defect recognition. This study has concentrated on influence of temperature variation of the transformer winding on FRA trace. An oil-free single phase model transformer involving concentric LV and HV windings is taken as a test object. The test object temperature is changed widely from...
Transformer is one of the crucial equipments in electric power network. Moisture in paper insulation acts as a catalyst in transformer insulation aging. Experience has shown that humidity will affect electrical strength of paper and pressboard as well as other insulation system materials by reducing degree of polymerization and accelerated aging. Thus, it is essential to determine the extent of moisture...
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