Estimation of Displacement at Interconnection Points of Substation Equipment Subjected to Earthquakes

This paper presents a simple and useful method to estimate the expected displacement at the interconnection point of substation equipment under seismic excitation. Analysis and a survey of qualification reports on standalone equipment revealed that for many types of equipment, the displacement is composed almost entirely of the contribution of the first vibration mode. The generalized single-degree-of-freedom method is therefore recommended to …