Title :
Disequilibrium of moisture in oil-pressboard insulation under transient temperature condition
Author :
Wei Wang ; Xin Wang ; Zhiqing Ma ; Chengrong Li ; Shaoyu Liu ; Yanwei Wu ; Zhen Hao ; Jixian Ma ; Kaihua Long
Author_Institution :
Beijing key Lab. of HV & EMC, North China Electr. Power Univ., Beijing, China
Abstract :
Moisture has strong influence on insulation performance of oil-pressboard system in power transformer. Moisture in oil and pressboard can be obtained from Oommen paper oil equilibrium curves under constant temperature condition. Temperature of power transformer is related to its load and the atmospheric temperature. If atmospheric temperature or load changed, oil-pressboard insulation will work under transient temperature condition. In present, there are few attentions to the disequilibrium of moisture in oil-pressboard insulation under transient temperature condition. In this paper, a test system has been set up which consists of programmable oven, Karl Fischer moisture meter and oil-pressboard samples. Two kinds of transient temperature conditions have been simulated which were 80°C to 20°C in 5 hours, 20°C to 80°C in 5 hours. Moisture in oil and various thick pressboards from 0.5mm to 5mm have been measured in these two conditions. The results have been presented and analyzed.
Keywords :
moisture; power transformer insulation; power transformer testing; transformer oil; Karl Fischer moisture meter; Oommen paper oil equilibrium curves; atmospheric temperature; constant temperature condition; insulation performance; moisture disequilibrium; oil-pressboard insulation system; power transformer; size 0.5 mm to 5 mm; temperature 20 degC to 80 degC; temperature 80 degC to 20 degC; test system; time 5 hour; transient temperature condition; Moisture; Moisture measurement; Oil insulation; Power transformers; Temperature measurement; Transient analysis; Moisturet; disequilibrium; oil-pressboard; transient temperature;
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
DOI :
10.1109/CMD.2012.6416295
