一起400 kVA配电变压器出口短路故障分析  

Analysis of the Outlet Short Circuit Fault for a 400 kVA Distribution Transformer

作　　者：陈浩宇 张健 崔聪 咸日常[2] 胡玉耀 CHEN Haoyu;ZHANG Jian;CUI Cong;XIAN Richang;HU Yuyao(State Grid Zaozhuang Power Supply Company,Zaozhuang 277100,China;College of Electrical and Electronic Engineering of Shandong University of Technology,Zibo 255049,China)

机构地区：[1]国网山东省电力公司枣庄供电公司,山东枣庄277100 [2]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《山东电力技术》2020年第8期14-17,共4页Shandong Electric Power

基　　金：国家电网公司科技项目“配电变压器绝缘防护与噪声抑制关键技术研究及应用”(5206101801UT)。

摘　　要：分析一起400 kVA配电变压器遭受低压出口短路冲击后绕组发生变形的典型案例,作为后续绕组变形累积效应故障分析的参考基础。首先,将故障变压器返厂解体检查,通过外观观察,发现该配电变压器高压绕组已发生形变,绕组机械强度下降。其次,结合该配电变压器试验获取的数据,分析得出该配电变压器由于多次遭受低压侧出口短路电流冲击,累积效应使绕组发生形变,最终导致绝缘击穿。最后,根据故障原因分析,提出相应针对性维护措施和注意事项,具有一定的工程应用价值。A typical case of winding deformation is analyzed for a 400 kVA distribution transformer impacted by low-voltage outlet short-circuit,providing data base for subsequent failure analysis of the cumulative effect of winding deformation.Firstly,the faulty transformer is returned to the factory for disassembly and inspection.Through visual observation,it is found that the high-voltage winding of the distribution transformer has been deformed and the mechanical strength of the winding has decreased.Secondly,combined with the data obtained from the test of the distribution transformer,the analysis shows that the distribution transformer suffered from multiple short-circuit current impacts on the low-voltage side outlet,and the cumulative effect caused the winding to deform,resulting in insulation breakdown.Finally,according to the analysis of the cause of the failure,the corresponding targeted maintenance measures and precautions are proposed,which have certain engineering application value.

关 键 词：配电变压器 出口短路 绕组变形 

分 类 号：TM421[电气工程—电器]