电力变压器热故障的在线诊断技术  

An on-line diagnosis method of transformer hot fault

作　　者：郭英军[1] 孙丽华[1] 孙会琴[1] 冉海潮[2] 

机构地区：[1]河北科技大学电气信息学院,河北石家庄050054 [2]河北科技大学环境科学与工程学院,河北石家庄050018

出　　处：《河北科技大学学报》2007年第2期147-149,共3页Journal of Hebei University of Science and Technology

基　　金：河北省自然科学基金资助项目(F2005000422);河北省科技厅指导性计划项目(052135168)

摘　　要：提出了基于变压器表面的红外热图像对变压器热故障进行在线诊断的方法。利用红外热像仪实时拍摄变压器表面的热图像,建立其温度分布场。根据变压器的表面温度、内部结构参数、物理特性参数和环境温度,建立其传热模型,对变压器内部铁芯故障点温度进行反演计算,通过与离线DGA诊断结果进行比较,证明了该方法的可行性,实现了变压器热故障的非接触、在线诊断。An on-line diagnosis method of transformer hot fault is given based on infrared thermal imaging technology. Using real-time thermal imaging of transformer surface, the temperature distribution field is built. A heat-transfer model is established in accordance with some parameters, such as surface temperature, internal structure parameters, physical characteristics and environmental temperature of the transformer. And then the internal hot fault temperature of transformer is calculated through the model. By comparing it with DGA diagnosis result, the feasibility of the diagnosis method is proved. And then the on-line and non-contact diagnosis of transformer latent hot fault is realized.

关 键 词：电气火灾 在线诊断 电力变压器 DGA方法 红外热像技术 

分 类 号：TM407[电气工程—电器] TN219[电子电信—物理电子学]