基于红外热成像仪的变压器短路故障检测新方法研究  

The Research on New Fault Detection of the Oil-immersed Transformer on Infrared Thermal Imager

作　　者：刘文娟 樊建平 李恺洋 Liu Wenjuan;Fan Jianping;Li Kaiyang(Guangzhou CRS Junfa Electric Co.,Ltd.,Guangzhou 511400,China)

机构地区：[1]广州中车骏发电气有限公司,广州511400

出　　处：《机电工程技术》2022年第12期288-292,共5页Mechanical & Electrical Engineering Technology

摘　　要：为探索变压器半成品短路故障检测新方法,提高故障检测准确率及效率,降低检修成本,详细阐述了红外热成像仪在油浸式变压器半成品短路故障检测中的应用实例,当变压器箔绕线圈存在毛刺(或异物)扎破绝缘而导致层间短路时,会表现为变压器半成品试验检测变比异常,而绝缘破损点因未经高能量放电较难通过肉眼检查出;通过设计巧妙的器身故障检测方案,将线圈短路故障点放大(使绝缘碳化),并利用红外热成像仪辅助快速确定故障点方位,后期通过拆开线圈在故障点定位范围内查找绝缘碳化点,快速找到故障部位并进行修复处理,提高了返修效率,节省了返修成本。实际应用表明新的检测方法使变压器维修成本降低了70%。In order to explore a new method for detecting the short circuit fault of transformer semi-finished products,improve the accuracy and efficiency of fault detection,and reduce the maintenance cost,the application example of infrared thermal imager in detecting the short circuit fault of oil immersed transformer semi-finished products was described in detail.When the insulation of transformer foil coil was punctured by burrs(or foreign bodies),resulting in short-circuit between layers,it would be reflected in abnormal ratio detection in semi-finished products of transformer,while the breakage point of insulation was difficult to be detected by naked eye due to high energy discharge.Through the ingenious design of fault detection scheme for transformer body,the short-circuit fault points of coils were amplified(to carbonize insulation),and the orientation of fault points was quickly determined with the help of infrared thermography.Then,the fault points were quickly found and repaired by disassembling coils in the fault location range,which improved the efficiency of repairing and saved the cost of repairing.The practical application shows that the new detection method reduces the transformer maintenance cost by 70%.

关 键 词：红外热成像仪 油浸式变压器 故障检测 线圈短路 检修成本 

分 类 号：TM407[电气工程—电器]