Lightning Breakdown Macroscopic Behavior Analysis of Three-element Mixed Insulation Oil-Paper System
ID：175
Submission ID：186 View Protection：ATTENDEE
Updated Time：2023-11-20 13:53:25 Hits：462
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Abstract
The breakdown voltage of insulation oil-paper composite system is important for the safe operation of transformer. In this paper, the voltage and current waveform, lightning impulse breakdown voltage, discharge development time of mineral oil-paper system (MO-P) and three-element mixed insulation oil-paper system (TEMO-P) at gap lengths of 0, 5, 10 and 15 mm, as well as the morphologies of oil-impregnating paperboard are studied. The results show that under negative polarity, the increase of lightning impulse breakdown voltage with gap of TEMO-P is greater than that of MO-P. Under positive and negative polarity, the rapid rise zones of MO-P discharge development time are different, ranging from 10 mm to 15 mm and from 0 mm to 10 mm respectively. Both positive and negative polarity of TEMO-P increased at 5 mm to 15 mm. After the breakdown under negative polarity, the surface of TEMO-P is prone to large area dendritic.
Keywords
discharge development time, lightning impulse breakdown voltage, mineral oil-paper system, three-element mixed insulating oil-paper system
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