Title :
Electrical breakdown properties of oil-paper insulation under AC-DC combined voltages
Author :
Yan Wang ; Jian Li ; Youyuan Wang
Author_Institution :
State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
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 oil paper 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.
Keywords :
electric breakdown; paper; power convertors; power transformer insulation; transformer oil; transformer windings; AC-DC combined voltages; converter transformers; electrical breakdown property; exponential failure models; inverse power; oil-filled power transformer insultaion; oil-impregnated paper; oil-paper insulation; transformer windings; Breakdown voltage; Electric breakdown; Oil insulation; Power transformer insulation; Testing; AC-DC combined voltage; converter transformer; electrical breakdown; failure model; oil-paper insulation;
Conference_Titel :
Power Modulator and High Voltage Conference (IPMHVC), 2010 IEEE International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-7131-7
DOI :
10.1109/IPMHVC.2010.5958308
