| 摘要 |
<p>PURPOSE:To early discover small oil leakage by obtaining a recovery line indicating relationship between oil amount and oil temperature from oil amount data and oil temperature data for two time zones, and comparing the two oil amount presumed values obtained from the respective lines. CONSTITUTION:A monitor 10 receives oil amount data of insulation oil of phases, oil temperature data through a data processor 11 to detect leakage oil. The data are collected at each hour for two weeks. The data are classified into two groups, i.e., before one week and before that, and recovery lines indicating relationship between the oil amount and the oil temperature are obtained in each group by a recovery line calculator 12. Further, presumed oil amount values of the respective groups are obtained from average value of the oil amounts, slope of the line, average oil temperature, reliability limit, etc., by an oil amount presumed value calculator 13. Then, the oil amount presumed values of both the groups are compared in an oil amount presumed value comparator 14, and determined by an oil leakage generating state discriminator 15.</p> |
