METHOD OF DIAGNOSING DETERIORATION OF OIL-FILLED ELECTRIC APPARATUS AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a device for diagnosing deterioration of an oil-filled electronic apparatus, which can diagnose the degree of deterioration of an insulating oil filled in an electronic apparatus without stopping the unit in operation nondestructively with high accuracy, and a method thereof. SOLUTION: A space in a cell 5 is filled with an insulating oil 4 used in the apparatus whose deterioration is to be diagnosed and is irradiated with two kinds of light having different wavelengths from a light source 8 and the two kinds of light passing through the cell 5 are received by a light receiving part 9, respectively. A computing part 10 determines a difference in transmission loss between the two kinds of lights from the results of received lights. By checking the determined difference in transmission loss against the previously measured relations between the difference in transmission loss and the degree of deterioration of the insulating oil 4, the corresponding degree of deterioration is determined.