DIAGNOSTIC SYSTEM OF ON-LOAD TAP CHANGEOVER DEVICE, DIAGNOSTIC METHOD OF ON-LOAD TAP CHANGEOVER DEVICE, DIAGNOSTIC SYSTEM OF POWER TRANSFORMER

摘要

To provide a diagnostic system capable of highly accurate diagnosis of the degree of deterioration of insulation oil, with relatively simple device configuration, in the on-load tap changeover device of transformer.SOLUTION: A diagnostic system of an on-load tap changeover device having an insulation oil tank in which insulation oil is sealed, a changeover switch performing tap changeover operation of a tap winding placed in the insulation oil tank, a tap selector for selecting the tap position of the tap winding, and a polarity (displacement) switch for inverting the polarity of the tap winding or a winding for connection therewith, further includes an arc discharge light detector for detecting the arc discharge light discharged at the tap position changeover time of the tap selector, and the degree of deterioration of the insulation oil is diagnosed based on the arc discharge light detected by the arc discharge light detector.SELECTED DRAWING: Figure 1