In order to study the seismic performance of 550 kV composite external insulation bushing for UHV substation in high altitude area, the shaking table test of seismic simulation was carried out on a real bushing and the numerical simulation analysis was carried out. By inputting white noise random wave and artificial wave, the dynamic characteristics of the specimen and the acceleration, strain and displacement responses of the key parts under the peak acceleration of 0.2g, 0.6g and 0.8g earthquakes are obtained. Through numerical simulation analysis, the mechanical response of the casing under wind load is verified. The results show that the first-order frequency of 550 kV composite external insulation bushing is 3.69 Hz ; under the action of the standard time history wave with the basic seismic acceleration of 0.8g, the strength of the casing composite component meets the seismic requirements, and the displacement response is obvious. The strength of the casing itself meets the mechanical requirements under wind load.
China is an earthquake-prone country. Recent earthquakes such as Wenchuan have caused serious damage to power facilities. As the most important electrical equipment in UHV substations, transformers are facing a huge threat of earthquake disasters. As an important way to improve the seismic capacity for transformer equipment, seismic isolation technology can effectively solve the problem of insufficient seismic capacity of UHV transformers in areas with high seismic intensity. The soil-structure interaction is not considered in the current isolation design and evaluation of UHV transformers, which is not conducive to the refined seismic isolation design and evaluation of UHV transformers. Combined with the structural characteristics of UHV Transformer equipment, this paper put forward the seismic isolation test method of UHV Transformer with soil structure interaction, which provided a basis for the isolation test and isolation performance evaluation of UHV Transformer.
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