Title :
Gases dissolved in natural ester fluids under thermal faults in transformers
Author :
Yu Liu ; Jian Li ; Zhaotao Zhang
Author_Institution :
State Key Lab. of Power Transm. Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Abstract :
Natural ester fluids are biodegradable and fire-resistant liquid dielectrics which have been used in power transformers in recent years. This paper presents the results of an experiment to simulate typical thermal faults in power transformers. The temperatures of thermal faults ranges from 90°C to 800°C. Dissolved gases in natural ester fluids under the thermal faults were investigated. The experiment results show that the characteristic gases dissolved in natural ester fluids differ from those in mineral insulating oils under the thermal faults. The criteria of the three-ratio method in the IEC standard for the traditional dissolved gas analysis (DGA) are not suitable for fault diagnosis of transformers filled with natural ester fluid.
Keywords :
chemical analysis; dielectric liquids; fault diagnosis; power transformer insulation; transformer oil; DGA; IEC standard; biodegradable dielectrics; dissolved gas analysis; fault diagnosis; fire-resistant liquid dielectrics; mineral insulating oils; natural ester fluids; power transformers; temperature 90 degC to 800 degC; thermal faults; three-ratio method; transformer oil; Chemicals; Gases; Minerals; Oil insulation; Power transformer insulation; dissolved gas analysis; natural ester fluid; thermal fault; transformer;
Conference_Titel :
Electrical Insulation (ISEI), Conference Record of the 2012 IEEE International Symposium on
Conference_Location :
San Juan, PR
Print_ISBN :
978-1-4673-0488-7
Electronic_ISBN :
1089-084X
DOI :
10.1109/ELINSL.2012.6251462
