As a necessary transformer equipment

the safe and economic operation of the transformer is essential.In order to study the influence of harmonics on transformer insulation aging

this paper first theoretically analyzes the relationship between the hottest spot temperature and the harmonic content

and its influence on the three indicators of transformer thermal aging rate

aging acceleration factor and remaining life

and then combines the relationship between the hottest temperature and the harmonic content under the three cooling methods of natural oil circulation

forced oil circulation

and forced oil circulation guidance

the curves of transformer thermal aging rate

insulation aging acceleration factor

remaining life and total harmonic current distortion rate are drawn

and the influence of harmonics on transformer insulation is quantified.