Study On Seismic Behavior Of Typical Structure Of Power Transmission Installations

The earthquake is the most likely reason that causes the serious damage of powersystem. The security of power system directly influences the development of nation andthe life of people. The damage of the power system will cause serious disasters andeconomic losses. In view of the high vulnerability of electrical installations underearthquake and less research on the seismic behavior of power facility, this studymainly focus on the applicability of the seismic design code on the electricalinstallations. In order to make the code guide engineering design better. Improve theseismic resistance of electrical installations, and try to reduce the damage of the powersystem and the loss by earthquake. The main works are listed as follows:（1）The shake table tests of insulator and arrester which is braced by two differentsupport are conduct. The testing results indicate that the arrester is higher and heavierthan the insulator, so the seismic resistance of arrester is worse than the one of insulator.The insulator should use Φ250mm×6mm circular steel tubular support. At highearthquake intensity region, the arrester should use Φ300mm×6mm circular steeltubular support. The mean dynamic magnification fact measured by the test is1.7,which is greater than the specified value in “Code for design of seismic of electricalinstallations”（GB50260-96）. The specified value in the code should be update, inorderto make larger safety reserves for the installations.（2）Numerical analysis on the seismic behavior of the of typical structure ofpower transmission installations is conducted, by using the finite element analysismodeling with ANSYS. The analysis results shows that the dynamic magnification fact of Φ250mm circular steel tubular support is1.1times large than the one of Φ300mmcircular steel tubular support. The mean dynamic magnification facts at the top ofsupport of220kV insulator and arrester are greater than the specified value in the code.It indicates that the respecified value in the code should be update, inorder to makelarger safety reserves for the installations. With the comprehensive analysis of the data,the seismic design should follow the recommendation that the insulator should useΦ250mm×6mm circular steel tubular support and the arrester should useΦ300mm×6mm circular steel tubular support.