Title :
Fault gases dissolved in vegetable insulating oil under electrical faults
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 :
fault diagnosis; power transformer insulation; transformer oil; vegetable oils; DGA; IEC standard; biodegradable liquid dielectrics; electrical faults; fault diagnosis; fault gases dissolved analysis; fire-resistant liquid dielectrics; mineral insulating oils; natural ester fluids; power transformers; temperature 90 degC to 800 degC; thermal faults; three-ratio method; vegetable insulating oil; Chemicals; Gases; Minerals; Oil insulation; Power transformer insulation; dissolved gas analysis; natural ester fluid; thermal fault; transformer;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2013 IEEE Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CEIDP.2013.6748121
