Research and Practical Application of Transformer Emergency Standby Calculation and Assessment Method

Abstract

With the development of the power system, the large transformer of the power grid is also increasing, and the sudden events of the transformer will cause serious influence on the power supply in the area. Using standby transformer to replace the fault transformer is an effective way to deal with transformer sudden fault. This paper first concerns the core problem of the theoretical calculation of transformer emergency standby, that is to set up the simulation model and calculation method of three phase three winding transformer with asymmetrical parameters. Through the NETOMAC simulation platform developed by the German SIEMENS company, the calculation method of the proposed simulation model is realized. Based on the simulation model and calculation method of the unsymmetrical parameter three phase three winding transformer, the 500kV transformer in East China power grid is taken as the research object, and the problem of transformer emergency standby is analyzed and calculated comprehensively. On the basis of a large number of calculation conclusions of the transformer standby applicability, the assessment method of transformer emergency standby applicability is proposed, and the relevant criterion and process are established. The transformer emergency standby calculation and assessment method proposed in this paper has very good practical application value. At present, the research results have been successfully applied to the emergency replacement of transformers in Shanghai power grid. The research results of this paper have a good prospect of application. The project implementation of the research results will save a lot of funds needed for the purchase of standby transformers. It has significant economic benefits and further improves the ability of emergency disposal of main transformer fault or sudden accident.