DETECTING METHOD FOR OIL LEAK OF CABLE LINE

PURPOSE:To improve the decision accuracy of leak oil of the OF cable line by comparing current and past measured oil amount patterns or current and past measured oil pressure patterns and detecting the oil leak of the OF cable line. CONSTITUTION:Respective data on the current load current, oil tank ambient temperature, cable surface temperature, etc., of the OF cable line 1 are inputted to a computer main body 3 on an on-line basis, or through a communication line 4, a keyboard 5, or a floppy disk 6 and stored on an external memory 8 as control data 10. This data 10 is used to obtain the measured oil amount pattern 11A consisting of the measured oil amount data in the specific current period and the pattern is displayed on a display device 9. Then, the measured oil amount pattern 12A in the specific past period which is obtained under the same conditions as those in the specific current period is retrieved by using the data 10 and the retrieved past pattern 12A is displayed on the display device 9. Those patterns 11A and 12A are used and compared with each other to decide whether or not there is an oil leak in the current line 1.