直流电压下油纸绝缘局部放电数值仿真研究述评

Review on Numerical Simulation of Partial Discharge in Oil⁃paper Insulation Under DC Voltage

直流电压下油纸绝缘的局部放电(partial discharge,PD)关系着换流变压器等关键输变电设备的安全可靠,而计算机技术的迅猛发展则促使PD数值仿真成为了探究PD机理、评估PD威胁的重要手段。文中首先阐述了PD仿真模型的研究现状,综述了abc电容模型、感应电荷概念模型、静电场模型、电流场模型以及迁移—扩散模型的建立机制及优缺点;其次,进一步分析了PD模型在交、直流电压下的主要差异以及目前直流电压下PD仿真的研究进展;最后,从仿真参数的确定以及多物理场的耦合两方面出发,讨论了仿真工况下油纸绝缘PD行为所面临的科学问题。基于上述讨论,期望为直流电压下油纸绝缘PD数值仿真研究提供启发和思路。

Partial discharge(PD)in oil-paper insulation under DC voltage is crucial to the safety and reliability of key transmission and transformation equipment such as converter transformers etc.With the rapid development of computer technology,PD numerical simulation has become an essential tool to explore the mechanism of PD and evaluate its threat.In this paper,the research status of PD simulation models is described.Then,the set up mechanism,advantages and disadvantages of the abc capacitance model,induced charge concept model,electrostatic field model,electric current field model and drift-diffusion model are comprehensively described.Moreover,the main differences between the PD simulation models under AC and DC as well as the research development of the PD simulation under DC voltage are discussed further.Finally,the scientific problems faced by the PD behavior of oil paper insulation under the simulation condition is discussed from two aspects,including the determination of simulation parameters and the coupling of multi-physical fields.Based on above discussions,this paper aims to provide some foreseeable ideas for the numerical simulation of PD in oil-paper insulation under DC voltage.