变压器雷电冲击特性的融合仿真分析

Fusion Simulation Analysis of Lightning Impulse Characteristics of Transformer

变压器是电力系统中的核心设备,容易受到雷击的侵害,进而引发电力系统故障。针对这一现状,建立变压器的雷击模型并对其遭受雷电冲击时的特性进行研究具有重要意义。文融合PSCAD/EMTDC和ANSYS两种仿真模式,分别在两个平台上建立了雷电过电压暂态模型以及变压器有限元模型,利用多平台融合仿真来对变压器遭受直击雷、感应雷两种雷击形式时的磁特性和温度特性进行观测分析。仿真分析表明,新的PSCAD/EMTDC及ANSYS融合仿真模式可以准确而细致地模拟变压器遭受雷电冲击时的关键过程,对变压器各部分磁密和温度变化情况进行了观测,为变压器雷击现象的研究提供了新的思路。

Transformers are the core equipment in the power system and are vulnerable to lightning strikes,which can lead to power system faults.In view of this situation,it is of great significance to establish a lightning strike model of transformer and investigate its characteristics when it is subjected to lightning strikes.In this paper,two simulation modes,namely PSCAD/EMTDC and ANSYS,are fused and the lightning overvoltage transient model and the transformer finite element model are established on both platforms.The multi-platform fusion simulation is used to observe and analyze the magnetic and temperature characteristics of transformer subjected to direct and induced lightning strikes.The simulation analysis shows that the new PSCAD/EMTDC and ANSYS fusion simulation mode can accurately and carefully simulate the key process of transformer subjected to lightning strikes,and observe the magnetic density and temperature changes of various parts of the transformer,which provide a new idea for the study of transformer lightning strike phenomenon.