Service life assessment method for ultra-high voltage grid GIS housing containing defects

Abstract

The invention discloses a service life assessment method for an ultra-high voltage grid GIS housing containing defects. Currently, a dedicated method for assessment on safety and service life of a GIS housing containing defects still lacks. The method comprises structural data acquisition of the ultra-high voltage grid GIS housing, defect feature acquisition of the ultra-high voltage grid GIS housing, defect expanding limit determination of the ultra-high voltage grid GIS housing, material and welded seam performance acquisition of the ultra-high voltage grid GIS housing, fatigue crack extended model establishment of the ultra-high voltage grid GIS housing, monitoring and extraction of working condition feature parameters of the ultra-high voltage grid GIS housing, and fatigue cycle number calculation of the ultra-high voltage grid GIS housing. Structure, defects, material performance and alternating working condition load of the ultra-high voltage grid GIS housing are taken into comprehensive account, and defect present situation and limit size, as well as load alternating features and crack expanding performance are thus obtained so as to precisely estimate fatigue service life of the ultra-high voltage grid GIS housing.

Description

technical field [0001] The invention relates to the field of gas-insulated metal-enclosed switchgear, in particular to a method for evaluating the life of a defect-containing GIS shell of an UHV power grid. Background technique [0002] The construction and development of UHV power grids is the basic strategy and planning for optimizing energy distribution and ensuring energy strategic security. Gas-insulated metal-enclosed switchgear (GIS) is a switchgear in the power industry. It has the advantages of small size, small footprint, small daily maintenance workload, and low frequency of failure. It is widely used in urban high-voltage and ultra-high voltage power grid systems. use. GIS may have defects in production and on-site installation. Once an accident occurs, it will have a wide range of influence, long repair time, and a great impact on the power supply system. The UHV GIS shell is the shell of the switchgear. As its application becomes more and more extensive, the ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the estimation of the fatigue life of the existing UHV GIS shell defect under the action of alternating loads during use, and provides a com

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