过负载下变压器绕组平均温度梯度建模及分析  

Modeling and Analysis of Average Temperature Gradient of Transformer Windings Under Overload

作　　者：周利军[1] 唐浩龙 王路伽 王健[1] 蔡君懿 郭蕾[1] 刘红文 ZHOU Lijun;TANG Haolong;WANG Lujia;WANG Jian;CAI Junyi;GUO Lei;LIU Hongwen(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China;Yunnan Electric Power Research Institute,Yunnan Power Grid Co.,Ltd.,Kunming 650217,Yunnan Province,China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756 [2]云南电网有限责任公司电力科学研究院,云南省昆明市650217

出　　处：《电网技术》2019年第2期591-597,共7页Power System Technology

基　　金：国家重点研发计划项目(2017YFB1200802-12);国家自然科学基金项目(51577159)~~

摘　　要：目前,随着电力负荷的增长,变压器时常面临着过负载运行的情况。为了研究其过负载运行时绕组平均温度梯度的变化规律,该文提出了一种过负载下变压器稳态温升计算模型。该方法基于流体阻力特性建立全局油路动量模型。针对绕组、油流及散热器间的耦合传热问题,应用能量守恒建立描述场域温度分布的控制方程。同时,建立三维数值模型与实验测试平台对比验证该文所述模型。研究结果表明:应用该文所提变压器温升计算方法可根据其设计参数求出任意过负载运行时的绕组平均温度梯度及其变化规律;该文模型计算结果与CFD软件计算结果基本一致,二者平均相对误差为3.35%,与实验测试结果相比,平均相对误差为5.37%,验证了该文模型的准确性与有效性。Currently, with increase of load, power transformers are often faced with overload operation. In order to find out the law of average winding temperature gradient under overload operation, a calculation model for steady temperature rise of transformer under overload is presented in this paper. Firstly, a global oil momentum model is established based on fluid resistance. Then, according to the coupled heat transfer between winding, oil flow and radiator, a control equation describing temperature distribution is established using energy conservation law. Simultaneously, a three-dimensional numerical model of transformer and the temperature rise test platform are established to verify the proposed model. Studies show that, according to the design parameters, the average temperature gradient of transformer winding under overload operation can be obtained using the calculation method presented in this paper. The average error between the calculated method and CFD software is 3.35%, and the average error is 5.37% compared with actual test results, verifying accuracy and effectiveness of the model.

关 键 词：油浸式变压器 绕组平均温度梯度 过负载运行 温升 传热 绕组指数 

分 类 号：TM721[电气工程—电力系统及自动化]