Power transformer remaining life diagnosis apparatus and remaining life diagnosis method

摘要

PPROBLEM TO BE SOLVED: To provide an apparatus and method for assessing the remaining life of transformer for power supply with a good accuracy. PSOLUTION: This method prepares a life loss obtained from a thermal history corrected by the load record of the removed transformer, local weather observation data and periodical/round inspection record about the maximum oil temperature, and a master curve showing the direct relationship with the average overlap measured from the coil insulating paper of the removed transformer; and then assess the remaining life by applying to the master curve the life loss obtained from the thermal history correted by the load record of the transformer subject to remaining life assessment, local weather observation data, and periodical/round inspection record about the maximum oil temperature. PCOPYRIGHT: (C)2006,JPO&NCIPI