变压器绕组累积形变模拟与仿真

Modeling and simulation of transformer winding accumulation deformation

随着现代电力系统的建设与发展,短路电流水平不断攀升,甚至超过了有些变压器耐受水平。对变压器进行校核可以及时发现绕组缺陷,有利于电力部门维修进而避免电力事故的发生。为此,提出了考虑短路电动力累积效应的变压器校核方法。首先,分析了变压器绕组形变累积效应与短路电流冲击次数的关系;其次,利用有限元方法和有限元软件,搭建了模拟了短路情况下变压器漏磁场-电动力冲击-绕组形变的累积效应仿真模型;最后,在已构建仿真模型的基础上,对实际运行变压器绕组形变情况进行了模拟分析。研究结果可作为变压器校核提供参考,具有较重要的理论参考意义。

With the construction and development of modern power systems,the level of short-circuit currents continues to rise,even exceeding the tolerance level of some transformers.To check the transformers can detect winding defects in time,which is beneficial to the maintenance of the power sector,thus avoiding the power accidents.Therefore,a transformer calibration method considering the cumulative effect of short-circuit electric power is proposed.Firstly,the relationship between the cumulative effect of transformer winding deformation and the number of short-circuit current surges is analyzed.Secondly,the finite element method and finite element software are used to simulate the cumulative effect of the leakage magnetic field-electric shock-winding deformation of the transformer under short-circuit conditions.Finally,with the simulation model built the simulation model built,the simulation analysis of the actual running transformer winding deformation is carried out.The research results provide a guidance for transformer calibration and have important theoretical reference significance.