Study On The Modern Design Method Of Voltage Transformer

By far, some reliability designs and optimization designs of voltage transformer are studied, but the methods they adopted are still traditional. This paper adopts modern design method which combines with finite element analysis, reliability design technique and optimization design technique, so the schemes obtained by modern design method are more economical and proper than those obtained by traditional method.At first, in this paper, the principle of voltage transformer is introduced, and the classification, basic parameters and error analysis of voltage transformer are stated.Secondly, the principle of finite element analysis of electromagnetic field is studied, Maxwell equations and differential equations are stated. In this paper, two dimensional finite element analysis of electromagnetic field to voltage transformer is studied by finite element analysis software ANSYS. Finite element mathematic model is built, and meshing subdivision is made, and boundary conditions are loaded on the finite element mathematic model and solution is done. Two dimensional magnetic field element PLANE53 and circuit simulation element CIRCU124 are studied.Thirdly, Reliability design of voltage transformer's porcelain sleeve is made. There are many sorts of bend stresses for the porcelain sleeve to endure, mainly including wind, earthquake, and inclination during product transportation. In this paper, determining method of stress distribution was investigated. Various stresses are superposed to deduce the calculation formula of stress distribution. The stress, strength and other design variables of porcelain sleeve can all be considered to obey normal distribution, and dealt as normally distributed variables during calculation. With the Stress-Strength interference Theory, the reliability design of voltage transformer's porcelain sleeve was studied.Fourthly, the optimization design module of ANSYS is studied, and the optimization design steps and optimization method are studied. The organic combination between FEA numerical calculation and optimization design is realized by the parameterized language and the optimization design module of ANSYS. As an example, Finite element analysis and optimization design are made to a voltage transformer of rating primary voltage 35KV, rating secondary voltage 100V, rating frequency 50HZ. After the optimization design loop, all the parameters can be listed, and the design variables can also be listed separately, the graphs can be displayed which indicate the appointed parameters alternating with the serial number. Through the comparison of many schemes, the best one can be obtained.If the modern design method is applied to manufacturers, we can reduce investment outlay, shorten development cycle, reduce calculation error, cut down experimental expense, reduce the cost and advance the reliability, so the study of the subject can yield good economic returns and social benefit.