Study on Thermal Response Characteristics and Thermal Decomposition of Solid Products of Grease in GIS

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In this paper, a comprehensive thermal analyzer was used to obtain the thermal response characteristics and main weight loss temperature range of grease in GIS. It was found that the main weight loss temperature range of MoS2lithium grease and VP980 grease was 340 °C to 420 °C and 330 °C to 430 °C, respectively. After heating decomposition experiments on MoS2lithium base grease and VP980 grease, the micro-morphology and elemental composition of solid decomposition products of MoS2lithium base grease and VP980 grease were analyzed by using environmental scanning electron microscopy and EDS spectrometer. The micromorphology of solid decomposition products of MoS2lithium grease and VP980 grease is quite different. The former is more fine and compact with granular convex surface, while the latter is loose and porous with smooth surface. The solid decomposition products of the two greases contain C elemental, metal fluoride and metal oxide, but the proportion of substance content is slightly different.

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