Background: The high-voltage substation station is an important node in the flexible Direct Current transmission system. In order to analyze the seismic vulnerability of the interconnected whole of the important equipment of the high-voltage substation station system, according to the comparison of the location and functional importance of each equipment in the substation station, the substation transformer, the flexible Direct Current substation valve and the valve hall are selected as the object of the present study through the interconnected whole of the wall- through casing, the suspended insulators and the pipe trusses, and the critical equipment of the substation station is classified and the linkage is established as the three-dimensional simulation model. Methods: Based on the Fourier transform theory, Wenchuan, EI-Centro and artificial three kinds of time-domain seismic waves are converted from time domain to frequency domain waveforms, i.e., the actual response spectra, and then the canonical response spectra under the action of a magnitude 9 earthquake a
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