Damping capability enhancement of the polyurethaneseismic isolation device for earthquake safety of highvoltage post insulators

Abstract

In the scope of the thesis, supplementary steel members were designed to increase the damping capacity of the seismic isolation device developed for high voltage insulators and numerical studies were carried out. In addition, the production and installation of seismic isolation devices and supplementary steel members were completed. Although the damage in the electrical systems during the earthquake does not directly affect human health, it has indirectly significant negative effects on search and rescue, health services and communication processes. In addition, serious financial losses occur in the process of making these systems operational. Higher elements are needed to provide electricity transmission in high voltage systems. For this reason, fragile porcelains insulator used here are more likely to be damaged during an earthquake. As an example, Great Sichuan earthquake with a magnitude of 7.9 (China-2008), the Mw 8.8 Chile earthquake (Chile-2010) and the Mw 7.2 El Mayor Cucapah earthquake (USA-2010) serious financial losses occurred due to the damage of the porcelain insulator. In this thesis, supplementary steel members with 2 different cross-section sizes was designed to improve the damping properties of the seismic isolation device, which was developed to improve the performance of porcelain insulators, one of the most sensitive elements in high voltage lines.