Exploring the feasibility of an aging model for paper insulation based on the repetition frequency of transients

Fast transients have become a considerable addition to the electric grid, especially on locations where DC generated current needs to be converted into AC. The full impact of fast transients on high voltage equipment is still unknown and the scope of this contribution is to show that fast repetition frequencies of fast transients decrease the life expectancy of paper insulation. An aging waveform has been applied to paper samples and two frequencies for the transients are analyzed, 5 kHz and 8 kHz. The times to failure are then compared against a pure sinusoid at 50 Hz. The results show that fast transients have a very clear effect on shortening the life time of oil impregnated cellulose by factors of 6 and 4 respectively.