| 摘要 |
PURPOSE:To detect the oil leakage of an oil-immersed electric apparatus in its early stages and moreover accurately by a method wherein a measured oil amount is made as the function of a temperature condition, the respective factors of the function are decided from the data of the oil-immersed electric apparatus at healthy time, the factors thereof are preserved in a memory part, and the oil amount is computed using the factors thereof. CONSTITUTION:The oil leakage detection part of an oil-immersed electric apparatus is constructed of an oil temperature sensor group 30 consisting of oil temperature sensors 30-1, 30-2,..., 30-n arranged at the places of the plural number such as the oil introducing ports of a core, a coil, etc. for example, to obtain the temperature condition inside of the oil-immersed electric apparatus, an oil amount sensor 31 to detect the oil amount according to the position of the oil level of a conservator, an operation part 32, a factor memory part 33 and an output part 34, for example. The oil amount calculated value Vc is decided according to the formula. In he formula, ki is a factor, and Ti is the temperature decided according to the i-th oil temperature sensor. The value of the factor ki is different according to the individual apparatus, and can not be decided generally. Therefore, the factor ki is decided by making the operation part 32 to the ki decision mode at healthy time enabled to confirm that there exist no oil leakage such as when a temperature test is to be performed at a factory, and when a temperature test is to be performed at an actual site, etc. The value thereof is preserved in the factor memory part 33. After then, the oil amount is decided by changing over the oil leakage detection mode. |
