Seismic evaluation of large-capacity thyristor valve is important to design the structure. It is necessary to clarify the criteria of selecting the hypothetic earthquake wave-form in the design since this wave-form affects the equipment design greatly.
The 0.3G three-cycles sinusoidal wave is widely used in Japan to verify the seismic performance of electrical equipment. However, special consideration is needed in designing the structures possessing plural natural frequencies within the predominant frequencies of the earthquake waves. This paper discusses a suitable artificial earthquake waves and a reasonable input wave-form to evaluate the seismic performance of multi-stage structures. Those results are applied to the nearly 1/4 scale model of a large-capacity thyristor valve.
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