The Prediction of Fatigue Damage Using Dynamic Characteristics for Steel Structures in 154kV Substation

Abstract

Fatigue damage increases with applied load cycles in a cumulative manner. Cumulative fatigue damage analysis plays a key role in life prediction of structures subjected to field load histories. Steel structures of substations are subjected to a large number of repetitive loading of different magnitudes caused mainly by mechanical equipment such as gas insulated switchgear (GIS). In this paper, a method is presented to predict the fatigue damage of the steel structures of a 153kV substation using dynamic characteristics. Through the field measurements and the fatigue analysis, it was observed that the accumulated fatigue damage was very small after a year of operation and the amount of accumulated fatigue damage will be smaller than 0.2 until the end of the working life. The structural safety of the 153kV substation can be guaranteed by the normal inspection.