固体介质内绝缘损伤演化的相场模拟研究  

Phase Field Simulation for Internal Insulation Damage Evolution in Solid Dielectric

作　　者：张语桐 吴泽华 谢宗良 朱思佳 刘鹏[1] 彭宗仁[1] ZHANG Yutong;WU Zehua;XIE Zongliang;ZHU Sijia;LIU Peng;PENG Zongren(State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China)

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),陕西省西安市710049

出　　处：《中国电机工程学报》2023年第17期6885-6894,共10页Proceedings of the CSEE

基　　金：国家电网有限公司总部科技项目资助(SGSNKYOOKJJS2100285)。

摘　　要：环氧复合材料广泛应用在电力设备中,而其绝缘损伤引发的电树枝化是设备长期带电运行的隐患。为此,该文应用相场模拟方法,选取随机放置的片状填料、规则放置的片状填料以及球形颗粒填料,构建固体介质内部绝缘损伤通道的演化模型,分析相场模型中扩散系数、载荷传递函数对通道发展速度、发展路径、劣化面的影响规律。结果表明:规则放置的片状填料对电树枝的发展有显著的阻碍作用;模型扩散系数的增加使得发展速度和劣化面积增加;传递函数表征了电树枝劣化难易程度的特性,其中性点横坐标能够显著改变了电树枝的生长特性。研究结果可为高性能绝缘材料设计、材料劣化评估、固体内部放电路径预测提供参考。Epoxy composite is widely used in power equipment.The electrical tree caused by insulation damage is the hidden trouble for long-time live operation in equipment.Therefore,the phase field method is used to analyze the evolution model for insulation internal damage propagation path of solid matrix.The randomly placed flake packing,regularly placed flake packing and spherical particle packing are selected as 3 kinds of different filler forms.The effects of parameters including diffusion coefficient and load transfer function on growth rate,propagation path and the damaged area of electrical tree are analyzed.The results show that the regular placement of micron filler has a significant hindrance to the development of electrical tree.The increase of diffusion coefficient boosts the development speed and increases the damage area.The transfer function represents the characteristics of the degree of deterioration of electrical tree.The horizontal coordinate of the neutral point can significantly change the growth characteristics of electrical tree.The results could provide reference for the design of high performance insulating materials,evaluation of material deterioration and prediction of solid internal propagation path.

关 键 词：相场模拟 绝缘损伤 电树枝 复合材料 有限元法 

分 类 号：TM21[一般工业技术—材料科学与工程]