Calculation method and device for service life prediction of GIS (Geographic Information System) air-tight seal rubber

Abstract

The embodiment of the invention discloses a calculation method for the service life prediction of GIS (Geographic Information System) air-tight seal rubber. The method comprises the following steps that: S1: obtaining a preset empirical constant value as well as rubber aging time and a rubber aging performance retention rate under preset aging temperature during the preset empirical constant value, and calculating the aging performance retention rate under different aging time of the GIS air-tight seal rubber at the preset aging time during the preset empirical constant value; S2: through the calculation value of the aging performance retention rate and a preset value of the aging performance retention rate corresponding to the calculation value, calculating the fitted value of the preset empirical constant value, and carrying out iterative update on the fitted value to obtain the empirical constant value corresponding to a minimum fitted value; and S3: through the empirical constant value corresponding to the minimum fitted value and a linear fitting method, obtaining a reaction rate constant value at the preset aging temperature, obtaining the apparent activation energy and the frequency factor of rubber, obtaining the reaction rate constant value of the rubber at different aging temperature, and obtaining the rubber prediction service life.

Description

technical field [0001] The invention relates to the field of life prediction, in particular to a GIS hermetic rubber life prediction calculation method and device. Background technique [0002] The air permeability of different rubber materials varies greatly. However, there is no research on the degree to which the air permeability coefficient affects the leakage of SF6. Although NBR has low gas permeability, it has a large permanent deformation at break, and the corresponding stress relaxation is also large, and after ozone aging, cracks and then fractures occur, so the long-term use of airtightness decreases. EPR has low air permeability and good aging resistance, so it is a good sealing material. In order to evaluate the performance of EPDM, nitrile and neoprene O-rings commonly used in GIS, three kinds of rubbers were tested under the same test conditions. The results show that compared with EPDM and nitrile rubber, the high temperature resistance and low temperature...

AI Technical Summary

Problems solved by technology

[0004] The national standard stipulates that the failure threshold for predicting the service life of rubber is usually 50%, but in actual use, oil leakage does not occur when the performance degrades to 50%, which may be delayed or delayed

However, there is a big difference in the life predicted by choosing different failure thresholds.

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