Analysis of Seismic Resistance of Large-Sized Electrical Equipment by the Method of Computational Analysis
Authors:   SE “State Scientific Engineering Center for Control System and Emergency Response, Koshmak A. S. , Krytskyi V. B. ,   JSC “Research and Design Institute ‘Energoproekt’”, Kurov V. O. ,   SE “State Scientific Engineering Center for Control System and Emergency Response, Oborskyi Y. O. ,   SE “State Scientific Engineering Center for Control System and Emergency Response, Pyrohov T. V. ,   SE “State Scientific Engineering Center for Control System and Emergency Response, Posokh V. O. ,   SE “State Scientific Engineering Center for Control System and Emergency Response
Published: November 2021

In the framework of this article, the problem of confirming the seismic resistance of large-sized electrical equipment is raised using the example of large asynchronous electric motors. The analysis of regulatory documents for the assessment of the seismic resistance of such equipment showed that confirmation of seismic resistance should be performed by an experimental method and other methods can be applied only with sufficient justification of the correct functioning of products. At the same time, rather stringent requirements are established for the test conditions, which in many cases are rather difficult to implement or cannot be met at all. The analysis of the possibility of testing the ASVO 15-23-34M1 electric motor, which is used as fan drives for seismic resistance by an experimental method, under the conditions of specialized organizations accredited in Ukraine, has been carried out. It was found that the existing test installations, due to their characteristics of carrying capacity, cannot be used to carry out tests for seismic resistance of electric motors weighing more than 600 kg. Considering the above, we can conclude that the justification of the seismic resistance of such equipment by experimental methods in Ukraine today is impossible. The analysis of current standards and special normative documents for seismic testing has been carried out. In these documents, clarifications are established on the separation of electrical equipment according to their design features, which make it possible to confirm the seismic resistance of certain groups of equipment by calculation methods. The requirements for the assessment of seismic resistance by the computational method and the evaluation criteria are established. The main purpose of such an assessment is to confirm that the engine retains its structural integrity and performance during and after the passage of seismic action. An assessment of the seismic resistance of the ASVO 15–23–34M1 electric motor was carried out by the method of computational analysis using the method of limiting seismic resistance. A finite element model of an electric motor has been built taking into account all the necessary operational and seismic loads. Strength analysis was carried out using the APM Structure 3D code. Taking into account the results of the performed calculations, it can be concluded that the seismic resistance of the engine during an earthquake with an intensity of up to 8 points according to the DSTU BV.1.1–28:2010 scale is confirmed. The engine withstands seismic loads and remains operational during and after the passage of an earthquake. The minimum value of the ultimate seismic resistance of the engine is determined by the seismic resistance of the stator HCLPF = 0.142 g. Based on the results of the analyses carried out, it can be concluded that the use of the computational method for assessing the seismic resistance of large-sized electrical equipment does not contradict the requirements of the current regulatory documents and can be used as a replacement for the experimental method in cases where tests are impossible or impractical. Modern computer simulation and calculation technologies allow for a comprehensive assessment of the equipment seismic resistance and obtain high reliability results.