TY - GEN
T1 - In-service ageing comparison study of natural ester and mineral oil filled distribution transformers
AU - Zhao, Yaohong
AU - Qian, Yihua
AU - Wei, Bin
AU - Wang, Ruifeng
AU - Rapp, Kevin James
AU - Xu, Yang
N1 - Publisher Copyright:
© 2019 IEEE.
PY - 2019/6
Y1 - 2019/6
N2 - In 2011, Shaanxi Power Grid Corporation, a Chinese utility, launched the first batch of natural ester-filled transformers in China to investigate the effectiveness of environmentally friendly insulating liquid in operating transformers. After 7 years continuous operation, two healthy 10kV 200kVA units were selected for study, one is filled with a soybean based natural ester liquid, Envirotemp™ FR3™ Fluid, the other is filled with mineral oil. These two distribution transformers (DT) were operating in the same city for about the same time period. Each transformer is made by a different manufacturers but have similar designs, however, their loading profiles differed significantly. The transformers were taken off the grid in June of 2018. Routine tests of the transformers and oils show that the transformers are in good condition. In January of 2019, both transformers were disassembled to test the oil and winding paper insulation samples. The oil condition, degree of polymerization and water content of paper samples from both units were compared. The details of the teardown and laboratory analysis are presented in this paper. In view of this in-service 7 year test, the compatibility of NE liquid with transformer construction materials under normal loading rate condition is confirmed. Also, the results offer useful status information about oil-paper insulating system for performance diagnosis in daily operation.
AB - In 2011, Shaanxi Power Grid Corporation, a Chinese utility, launched the first batch of natural ester-filled transformers in China to investigate the effectiveness of environmentally friendly insulating liquid in operating transformers. After 7 years continuous operation, two healthy 10kV 200kVA units were selected for study, one is filled with a soybean based natural ester liquid, Envirotemp™ FR3™ Fluid, the other is filled with mineral oil. These two distribution transformers (DT) were operating in the same city for about the same time period. Each transformer is made by a different manufacturers but have similar designs, however, their loading profiles differed significantly. The transformers were taken off the grid in June of 2018. Routine tests of the transformers and oils show that the transformers are in good condition. In January of 2019, both transformers were disassembled to test the oil and winding paper insulation samples. The oil condition, degree of polymerization and water content of paper samples from both units were compared. The details of the teardown and laboratory analysis are presented in this paper. In view of this in-service 7 year test, the compatibility of NE liquid with transformer construction materials under normal loading rate condition is confirmed. Also, the results offer useful status information about oil-paper insulating system for performance diagnosis in daily operation.
KW - Distribution transformer
KW - In-service operation
KW - Natural ester
UR - https://www.scopus.com/pages/publications/85071488396
U2 - 10.1109/ICDL.2019.8796673
DO - 10.1109/ICDL.2019.8796673
M3 - 会议稿件
AN - SCOPUS:85071488396
T3 - Proceedings - IEEE International Conference on Dielectric Liquids
BT - 2019 IEEE 20th International Conference on Dielectric Liquids, ICDL 2019
PB - IEEE Computer Society
T2 - 20th IEEE International Conference on Dielectric Liquids, ICDL 2019
Y2 - 23 June 2019 through 27 June 2019
ER -