Abstract
Oil-impregnated paper is a major type of insulation in oil-filled power transformers. In converter transformers, windings connected with converter valves have to withstand AC and DC combined voltages. This paper presented the experimental research on electrical breakdown properties of oilpaper insulation under AC-DC combined voltages. Electrical breakdown strength of oil-paper insulation specimens was measured through short-time tests under AC, DC, and AC-DC combined voltages. The combined voltages consisted of two different ratios of the AC to DC voltages. Through the constant-stress tests, the times-to-breakdown of oil-paper specimens were measured. Weibull parameters of the times-to-breakdown of specimens were estimated and the inverse power and exponential failure models of the specimens were presented.
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