550 kV gas-insulated metal closed transmission line (GIL) vibration tab experiment and multi-point input seismic response analysis

To study the seismic response law of Gas-Insulated Metal-Enclosed Transmission Line (GIL), the seismic simulation vibration table test and finite element analysis of a 550 kV GIL pipeline unit were conducted, and the partial GIL finite element model under the whole station domain was established based on the tested and verified GIL pipeline unit model, and the seismic response was analyzed. The results show that the safety factor of the three pillar insulators under the test and finite element analysis is the weak part of GIL; the finite element analysis result of GIL pipeline unit is in good agreement with the vibration table test result, and the maximum error of mode analysis, peak acceleration response and Von-Mise stress are 8.5%, 8% and 12%, indicating that the established finite element model and parameter setting are reasonable; The stress response of GIL key parts under YZ 2D multi-point input is greater than the consensus input, And the displacement peak response was increased by 31% over the consistent input, therefore, The influence of multi-point input should be considered in the GIL seismic design; The seismic response at 3D of 150 m/s) GIL only increased by 6.4% compared to YZ 2D multipoint input, The increase was smaller, Therefore, in the engineering design, Only considering the two-dimensional multi-point input can meet the requirements of the engineering calculation.