Title :
Comparison analysis to thermal aging properties of vegetable and mineral insulating oils
Author :
Shuhan Yao ; Jian Li ; Li, Lily ; Ruijin Liao ; Jinhui Zhou
Author_Institution :
State Key Lab. of Power Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Abstract :
The paper presents a comparison investigation to thermal aging behaviors between vegetable and mineral oil-paper insulation. Insulation pressboard samples were aged at 130 °C for 80 days in presence of either vegetable or mineral insulating oils, with copper wires together in well-sealed stainless vessels. The vessels contain some air in their vacant space at the beginning of the thermal aging experiments. The aged oil properties, including moisture content, acid number, viscosity, furfural concentration, dielectric loss, and AC breakdown voltage of oil samples, were measured at each interval of thermal aging experiment. The vegetable has a higher moisture content than mineral oil. Dielectric loss increases marginally with aging time in mineral oil while the increase is drastic for vegetable oil.
Keywords :
ageing; dielectric losses; moisture measurement; power transformer insulation; stainless steel; transformer oil; viscosity; AC breakdown voltage; acid number; aged oil properties; copper wires; dielectric loss; furfural concentration; insulation pressboard samples; mineral insulating oils; mineral oil-paper insulation; moisture content; oil samples; temperature 130 C; thermal aging behaviors; thermal aging properties; time 80 day; vacant space; vegetable insulating oils; viscosity; well-sealed stainless vessels; Dielectric loss measurement; Dielectric losses; Educational institutions; Vegetable oils; Weaving;
Conference_Titel :
High Voltage Engineering and Application (ICHVE), 2014 International Conference on
Conference_Location :
Poznan
DOI :
10.1109/ICHVE.2014.7035397
