基于热-电-流耦合的芯棒碳化复合绝缘子发热特性研究  

Heat Generation Characteristics of Mandrel Carbonized Composite Insulators Based on Heat-electricity-flow Coupling

作　　者：张东东 万武艺[1] 黄宵宁 高拓宇[2] 陈昊 张志劲 ZHANG Dongdong;WAN Wuyi;HUANG Xiaoning;GAO Tuoyu;CHEN Hao;ZHANG Zhijin(School of Power Engineering,Nanjing Institute of Technology,Jiangsu 211167,Nanjing Province,China;Jiangsu Electric Power Company Maintenance Branch,Jiangsu 211102,Nanjing Province,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology(Chongqing University),Shapingba District,Chongqing 400044,China)

机构地区：[1]南京工程学院电力工程学院,江苏省南京市211167 [2]国网江苏超高压公司,江苏省南京市211102 [3]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《电网技术》2023年第7期3010-3017,共8页Power System Technology

基　　金：国家自然科学基金项目-高海拔紫外照射和低温冰冻循环作用复合绝缘子粉化机制及其绝缘性能影响(No.52077018)。

摘　　要：该文基于有限元原理,建立了110 kV复合绝缘子热-电-流多物理场仿真模型,重点研究复合绝缘子芯棒碳化缺陷下,环境风速、缺陷位置及缺陷程度对复合绝缘子表面热场分布的影响。然后对仿真数据进行分析,建立了芯棒碳化通道长度与复合绝缘子表面温升之间的三次函数关系,空气流速与缺陷部位表面热量流失之间的幂函数关系,同时提出了考虑空气流动下的复合绝缘子缺陷部位发热仿真计算模型。最后利用该文仿真模型计算结果与现场实际劣化下的复合绝缘子红外测试结果进行对比验证,得到本模型温升相对误差为1.48%,缺陷部位温度相对误差为0.39%,验证了仿真模型的有效性。研究结果可为对现行的复合绝缘子红外诊断方法提供补充和参考。Based on the finite element principle,this paper establishes a multi-physics heat-electricity-flow field simulation model with the 110kV composite insulator.The purpose of the research focuses on the effects of the ambient wind speed,the defect location and the defect degree on the thermal field distribution characteristics of the composite insulator surface under the carbonized defect of the mandrel.Then,by analyzing the simulation data,we establish the cubic function relationship between the length of the conductive channel formed by the carbonized mandrel and the temperature rise on the surface of the composite insulator.,and the power function relationship between the air flow velocity and the heat loss on the defective surface.Based on these,the calculation model of heat generation on the defective surface of the composite insulator considering the air flow is also proposed.Finally,the calculations of the simulation model are compared with the infrared tests of the composite insulators under the actual deterioration in the field.The result shows that the relative error of temperature rise of this model is 1.48% and its relative error of defective area temperature is 0.39%,which may provide a reference and supplement for the existing infrared diagnosis method of the composite insulators.

关 键 词：复合绝缘子 发热 有限元 多物理场耦合 空气对流 

分 类 号：TM721[电气工程—电力系统及自动化]