In order to study the influence of impulse loads on the aging of oil paper insulation of traction transformer

in this paper

the accelerated thermal aging tests of oil-paper insulation under impulse loads were designed considering 3 factors such as the load rate

lasting time

and time interval of impulse loads. The change law of the degree of polymerization and tensile strength of the paper insulation during the aging process of the samples with different impulse load conditions were analyzed. The thermal aging data of oil-paper insulation under impulse loads were analyzed by using the Ekenstam aging dynamic model and entropy method

meanwhile

the impact of impulse loads on the operating life of oil-paper insulation was analyzed by converting the test results to the operating life at the rated load. The results show that the impulse load has an obvious effect on the aging rate and service life of oil-paper insulation and the impact strength is similar. Then

the aging rate

rate parameters and equivalent temperature in the Emsley model all have positive relations with the load rate and lasting time

and have negative relations with time interval. As the load rate and lasting time increase

the operating life of the oil-paper insulation decreases

and the greater the time interval

the longer the operating life. However

the relationship between service life and impulse load needs further study.