Seismic interconnecting effects of multi-span flexible conductor-post electrical equipment coupling system

Abstract

Previous seismic studies have mostly focused on standalone equipment and single-span coupling systems in electrical substations. To fully consider the impact of adjacent equipment, this paper proposed and validated a motion equations-based numerical solution method for seismic responses of multi-span flexible conductor-post equipment coupling systems (CPECSs). Based on this, the influence of equipment frequency, sag-to-span ratio, peak ground acceleration, and equipment number on seismic responses of multi-span CPECSs was investigated. Finally, the equipment range that significantly influences the seismic response of a piece of equipment was studied, thus the concept of seismic correlation segment was further proposed, beyond which the equipment can be ignored in terms of its influence on seismic responses. The results indicate that the proposed numerical method exhibits enough accuracy based on the validation by simulation techniques. The influencing laws of various interconnection factors on seismic responses of equipment provide support for seismic design of substations. Moreover, the seismic correlation segment can be obtained by presetting the response ratio of a piece of equipment in multi-span to single-span systems, not only reducing the number of concerned equipment but also maintaining the calculation accuracy.