微机型主变差动保护误动原因分析及对策

Analysis and countermeasures of misoperation of microcomper-based transformer differential misprotection

微机保护得到了广泛的应用,但还存在不明原因的误动情况。简单介绍了主变差动保护的基本原理,并通过对国内几起高、中、低压系统的微机型主变差动保护误动原因分析总结,归纳出新建变电站、运行中变电站、改造变电站主变差动保护误动的几种可能原因,并提出了防止主变差动误动的对策,在实际应用中起到了较好的效果。该文所介绍的主变差动误动原因和对策对线路纵差保护也有一定的借鉴经验。

The microcomputer based protection are widely used, but still there are maloperations sometimes with unidentified reasons.The paper introduces the differential basic principles of main transformer, and analyses the reason of tiny model transformer differential protection misoperation in a few high, medium and low voltage transformer substation. Lastly, the paper gives some answers of avoiding false actions of transformer differential protection, also brings forward some advice of avoiding maloperation of line differential protection.