Method for analyzing causes of increase in dielectric loss of transformer oil

摘要

A method for analyzing causes of an increase in dielectric loss of transformer oil, comprising: a) separately performing quantitative measurement on the contents of phthalate plasticizers in transformer oil of multiple sets of transformers during actual operation by using an established method for quantitative measurement of phthalate plasticizers in transformer oil, to obtain the concentrations of the phthalate plasticizers contained in the transformer oil; and (b) separately measuring the dielectric loss of the transformer oil by preparing a transformer oil sample in which the concentration of a di-n-butyl phthalate is known, and comparing the measurement results with a dielectric loss value of transformer oil containing no plasticizer for analysis to obtain a rule following which the dielectric loss of transformer oil increases with the increase of plasticizer content, thereby further confirming that analyzing the plasticizer content of transformer oil is a method for analyzing causes of an increase in dielectric loss of transformer oil. Therefore, the causes of an increase in dielectric loss of transformer oil can be analyzed by testing the plasticizer content of the transformer oil.