TY - JOUR
T1 - Aging Characterization of Oil-Paper Insulation Based on Fluorescence Characteristics of Suspended Fibers in Oil
AU - Zheng, Zhibo
AU - Lu, Bowen
AU - Gan, Wenyan
AU - Huang, Zhengyong
AU - Li, Jian
AU - Wang, Feipeng
AU - Li, Steven Qi
AU - Wang, Qian
N1 - Publisher Copyright:
© 1994-2012 IEEE.
PY - 2024
Y1 - 2024
N2 - The aging assessment of paper insulation is important for the operation, maintenance, overhaul, and decommissioning of transformers. This article presents a new method for assessing the aging of paper insulation in oil-immersed transformers based on the fluorescence characteristics of suspended fibers in oil. Accelerated thermal aging experiments are performed on oil-paper specimens at 120°C and 130°C to obtain fiber samples with different degrees of aging. Fluorescence emission (Em) and excitation (Ex) spectra of these fibers are obtained using a fluorescence characteristic test platform. The experimental results show that the fluorescence intensity decreases with the increase of aging and the fluorescence peak position is gradually redshifted. The mechanism of the fluorescence characteristics of fibers before and after thermal aging is studied by molecular simulation. The results show that fiber fluorescence intensity decreases with hydrogen bond strength and number reduction during thermal aging. Finally, a new aging characteristic parameter-fluorescence lifetime based on transient fluorescence characteristics of fibers is proposed. The relationship between it and the degree of polymerization is obtained. The fluorescence characteristics of fibers in oil show their potential for online monitoring of paper insulation aging.
AB - The aging assessment of paper insulation is important for the operation, maintenance, overhaul, and decommissioning of transformers. This article presents a new method for assessing the aging of paper insulation in oil-immersed transformers based on the fluorescence characteristics of suspended fibers in oil. Accelerated thermal aging experiments are performed on oil-paper specimens at 120°C and 130°C to obtain fiber samples with different degrees of aging. Fluorescence emission (Em) and excitation (Ex) spectra of these fibers are obtained using a fluorescence characteristic test platform. The experimental results show that the fluorescence intensity decreases with the increase of aging and the fluorescence peak position is gradually redshifted. The mechanism of the fluorescence characteristics of fibers before and after thermal aging is studied by molecular simulation. The results show that fiber fluorescence intensity decreases with hydrogen bond strength and number reduction during thermal aging. Finally, a new aging characteristic parameter-fluorescence lifetime based on transient fluorescence characteristics of fibers is proposed. The relationship between it and the degree of polymerization is obtained. The fluorescence characteristics of fibers in oil show their potential for online monitoring of paper insulation aging.
KW - Cellulose fibers in insulating oil
KW - fluorescence characteristics
KW - thermal aging
KW - transformer paper insulation
UR - http://www.scopus.com/inward/record.url?scp=85190737671&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2024.3389638
DO - 10.1109/TDEI.2024.3389638
M3 - Article
AN - SCOPUS:85190737671
SN - 1070-9878
VL - 31
SP - 3405
EP - 3413
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
IS - 6
ER -