Abstract

One of the most important components of an electrical substation is its power transformer, but this component is vulnerable to earthquakes. Several studies have demonstrated the good potential of base isolation to improve the seismic resistance of transformers. However, cost-effectiveness of a base isolation system is as important to the managers of a power grid as its isolation efficiency. Therefore, to investigate the cost-effectiveness of base isolation for large transformers, the framework of this two-part study comprised: (1) shaking table testing and (2) cost-effectiveness analysis. In the shaking table testing, the isolation efficiency of a friction pendulum system for a 220 kV transformer-bushing system was validated. In the cost-effectiveness analysis, the converter transformers of a typical substation were taken as examples to calculate the expected cost in a single earthquake event and the expected total life-cycle cost with/without the base isolation. The base isolation could impart considerable economic benefits in an extreme earthquake event and significantly reduce the risk of unacceptable earthquake-induced losses during the life period. Together, these two parts demonstrated the great cost-effectiveness of base isolation for large transformers in areas of high seismic intensity, underscoring the importance of further development and applications of this technology.

摘要

电力变电站的最重要组成部分之一是其电力变压器，但该组件易受地震的影响。多项研究表明，基础隔离具有改善变压器抗震性的良好潜力。但是，基本隔离系统的成本效益对电网管理者而言与其隔离效率同样重要。因此，为了研究大型变压器基本隔离的成本效益，此分为两部分的研究框架包括：（1）振动台测试和（2）成本效益分析。在振动台测试中，验证了220 kV变压器-衬套系统的摩擦摆系统的隔离效率。在成本效益分析中，以一个典型的变电站的换流变压器为例，计算一次地震事件的预期成本和有无基础隔离的预期总生命周期成本。基础隔离可以在极端地震事件中带来可观的经济效益，并显着降低生命周期内因地震引起的不可接受的损失的风险。这两个部分共同证明了在地震强度高的地区，大型变压器的基础隔离具有很高的成本效益，强调了进一步开发和应用该技术的重要性。基础隔离可以在极端地震事件中带来可观的经济效益，并显着降低生命周期内因地震引起的不可接受的损失的风险。这两个部分共同证明了在地震强度高的地区，大型变压器的基础隔离具有很高的成本效益，强调了进一步开发和应用该技术的重要性。基础隔离可以在极端地震事件中带来可观的经济效益，并显着降低生命周期内因地震引起的不可接受的损失的风险。这两个部分共同证明了在地震强度高的地区，大型变压器的基础隔离具有很高的成本效益，强调了进一步开发和应用该技术的重要性。