| Earthquake happens frequently in China for the past few years. Wenchuan earthquakes and the aftershocks caused ninety 110 kV and above substations damaged, and Lushan earthquakes made 24 substations impaired, which resulted in huge casualties and economic losses and inconvenience to rescue and reconstruction. Anti-seismic property of high-voltage electrical appliances has been considered one of utmost electrical performance index in State Grid Corporation of China and electrical appliances production enterprise, both in China and abroad. In the switching devices, Gas insulated enclosed combination switch(GIS) is a preferred form of high-voltage electrical equipment in earthquake-prone zone because it has a better seismic performance compared to other switchgears. However, it is difficult to assess the seismic performance on the vibration table because of its huge volume. Generally, the product seismic evaluation usually was lacked in the early design phase at high-voltage electrical enterprises result from high cost of the seismic test. Earthquake-resistant analysis was calculated by Taking ZF48-126 three-phase together box type miniaturization GIS. The calculation results could guide the structure optimization design of GIS, and evaluate seismic capacity of the equipment, which improve the safety margin. The main work and research contents in this paper are as follows:1. The topic origin and the significance of the research were reviewed. The seismic behavior of high voltage electrical equipment in China and abroad was summarized. The deficiencies of relevant research results and the problems needed to study furthermore were put forward.2. The theory of finite element method(FEM) and the solving steps were expounded. Three kinds of seismic design theory in the application of the seismic performance analysis of GIS were introduced. The advantages and disadvantages of three kinds of methods in seismic analysis of GIS were reviewed respectively.3. To establish the finite element model was built and modal analyzed at the same time. The analysis of the top 15 order natural frequency and the first 8 graph mode were analyzed. The influence of center of gravity position for the natural frequency was studied, and the optimization measures for adoption were discussed..4. According to GB/T13540-2009 《 High voltage switch equipment and control equipment of seismic requirements of the relevant provisions》, AG5 seismic levels 2% response spectrum of damping ratio was chosen using response spectrum method in the simulation of input seismic load. The simulation results showed that the 110 kV GIS studied in this paper was relatively close to the seismic frequency and it was easy to produce resonance when the earthquake occurs. The requirements for seismic resistance AG5 and the safety factor of the parts can be obtained through seismic spectrum. Compared with the response spectrum analysis results, the result of the analysis and calculation were verified using time analysis as a sequence after verification in the time domain method. According to the EI-Centro earthquake wave compared with the results of GIS structure dynamic response under Tianjin wave excitation, it was found that the influence of the waveform was relatively greater at the peak acceleration phase. The possible reasons of error were discussed.5. 110 kV GIS outlet shell was taken as the object of study. The outlet shell was optimized by surface response method. The feasibility of the optimization method was validated by the finite element simulation. After the stress analysis and maximal displacement analysis of porcelain jacket loaded the seismic waves, greater safety factor and higher GIS seismic levels on outlet shell have been achieved after optimizing. |
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