一起非同期并网引发的主变损毁事故分析  

Analysis of a Main Transformer Damage Caused by Non-Synchronous Grid Connection

作　　者：张伟 ZHANG Wei(East China Electric Power Test Research Institute,China Datang GroupScience&Technology Research Institute Co.,Ltd.,Hefei 230000,China)

机构地区：[1]中国大唐集团科学技术研究院有限公司华东电力试验研究院,安徽合肥230000

出　　处：《安徽电气工程职业技术学院学报》2020年第3期22-28,共7页Journal of Anhui Electrical Engineering Professional Technique College

摘　　要：文章介绍了一起发电机非同期并网造成主变压器损毁故障的案例,内容包括现场检查、事故原因分析、处理结果及建议等。此次故障的原因是3号机组并网过程中,因系统侧PT二次回路极性接反,在系统侧和待并侧相位相反时刻非同期并网,对主变压器产生冲击,在短路电动力的作用下,主变内部纵绝缘发生严重故障,主变重瓦斯动作跳5003开关造成机组非停,文中也给出了下一步工作建议,供同类电厂借鉴。This article introduces a case of main transformer damage caused by generator non-synchronous grid connection,including site inspection,cause analysis,handling results and suggestions.During the grid connection period of Unit 3,the polarity of the PT secondary circuit on system side is reversed.When the phases of the system side and the side to be combined are opposite,the main transformer is connected to the grid asynchronously,which has an impact on the main transformer.Under the action of short-circuit electric power,the internal longitudinal insulation of the main transformer has a serious fault.The 5003 switch of heavy gas action caused the unit to non-stop.The article also gives suggestions for the next step,which provide a reference for similar power plants.

关 键 词：非同期 主变损毁 故障分析 

分 类 号：TM410.7[电气工程—电器]