Abstract
The gas permeability of solid material is one of the important factors affecting pressure change properties of seal products. In this article, the pressure change analysis based on gas permeation and material outgassing principle of the seal cavity for satellite in-orbit is carried out. Through establishing the pressure change model of the seal cavity, analyzing the gas permeation of the encapsulating material, testing the material outgassing characteristics of the transformer body, this paper obtained the pressure change trend of the transformer sealing cavity during its time in-orbit and predicted the time required for it to escape from the lower pressure discharge region. Furthermore, a comparison of the pressure change time was made between the transformer seal cavity with in-orbit failure and ground simulation analysis of the same design, which shows good agreement. The analysis results can provide guidance for determination of the next power on time of the transformer and be used as a reference for decision makers.
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