supported in part by the National Natural Science Foundation of China under Grant 51867003;in part by the Natural Science Foundation of Guangxi under Grant 2018JJB160064 and 2018JJA160176;in part by Guangxi Key Laboratory of Power System Optimization and Energy Technology Project under Grant AE3020001829。
Operation level and service life of oil-immersed bushings are related to the moisture inside theirs cellulose insulation. However, the parameters extracted by using existing frequency domain spectroscopy (FDS) based m...