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AssigneeMitsubishi Electric Corporation
InventorsEiichi Nagao, Kentaro Taninouchi, Noboru Hosokawa, Tsuyoshi Amimoto, Kozo Tachibana, Hirotaka Muto, Junji Tanimura, Satoru Toyama
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An object of the invention is to provide a diagnostic method for an oil-filled electrical device that considers a temperature distribution in the oil-filled electrical device and enables accurate diagnosis to be conducted even when the method is applied to diagnosis of an actually operating device, and further provide a method with which such diagnosis of an oil-filled electrical device can be conducted from a component analysis value of an insulating oil in the oil-filled electrical device. The invention is a diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, and determines that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper reaches a preset surface resistivity management value is a time of occurrence of an abnormality.
A diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, said diagnostic method determining that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper decreases to a preset surface resistivity management value is a time of occurrence of an abnormality.
Dependencies are inferred from the claim text.