一起主变差动保护差流报警事件分析与处理  

Analysis and Processing of a Differential Protection Differential Current Alarm Event for the Main Transformer

作　　者：杨建斌 吕凤群 YANG Jian-bin;LYU Feng-qun(Huaneng Lancang River Hydropower Inc.,Kunming 650224,China)

机构地区：[1]华能澜沧江水电股份有限公司,云南昆明650224

出　　处：《云南水力发电》2023年第9期282-285,共4页Yunnan Water Power

摘　　要：以某水电厂为例介绍了一起主变保护装置差流报警异常事件,通过分析现场主变保护装置、机组故障录波装置波形文件及对主变差动回路原理公式推导和向量分析,验证故障的性质及故障可能的范围。查找到故障点后对故障进行处理。最后总结暴露出的问题,并提出相应防范措施。This article takes a hydropower plant as an example to introduce an abnormal differential current alarm event of the main transformer protection device.The nature and possible range of the fault are verified by analyzing the waveform files of the on-site main transformer protection device,the unit fault recorder,the derivation of the principle formula of the differential circuit of the main transformer and Vector calculus.After identifying the fault point,the fault is addressed.Finally,the exposed problems are summarized and corresponding preventive measures are proposed.

关 键 词：电流二次回路 相间短路 变压器 差动保护 

分 类 号：TV734.3[水利工程—水利水电工程] TV737