| 摘要 |
PROBLEM TO BE SOLVED: To make diagnosable accurately the deteriorated state of an insulator regardless of the influence of temperature or humidity at the time of diagnosis. SOLUTION: Since the quantity of ionic material deposited with time on the surface of an insulator does not change under the influence of temperature or humidity, the correlation between the electric conductivity of ionic material in aqueous solution and the insulation resistance value of an insulator at a prescribed temperature and humidity is obtained beforehand as shown in the figure. When the deteriorated state of the insulator is diagnosed, an electric conductivity of the ionic material deposited on the insulator which is a diagnosis object is measured, and an insulating resistance value of the insulator at a prescribed temperature and humidity is estimated based on the electric conductivity and the correlation, to diagnose the deteriorated state of the insulator.
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