Abstract:

Aiming at the low efficiency of the current temperature rise test methods for switchgear,the fast temperature rise test method is proposed through analyzing the relationship between the current amplitude and frequency and the temperature rise of the switchgear.Firstly,the rapid temperature rise limit of the corresponding switchgear is obtained through the statistical analysis of the historical test samples.Secondly,the test currents whose amplitude and frequency are over the rated value are imposed to the switchgear until the temperature rise reach the limited value.Lastly,the test current is restored to the rated value until the temperature rise reaches the stable value.The test results show that increasing current amplitude and frequency simultaneously can reduce the temperature rise test time of switchgear by 21.31%.The proposed fast temperature rise test method can reliably improve the temperature rise test efficiency of switchgear.

Key words: switchgear, current amplitude, current frequency, temperature rise test