剩磁对变压器的影响及防范措施

Effect of remanence on transformer and preventive measures

分析确定励磁涌流是造成武汉地铁某110 kV主变电所送电过程中变压器差动保护误动作的原因,而剩磁是造成励磁涌流的最根本原因。针对变压器的剩磁造成的励磁涌流提出相应的防范措施和判断方法,防止造成变压器差动保护误跳闸。

This paper analyzes and identifies the magnetic inrush current caused by incorrect operation of transformer differential protection during the transmission process of a 110 kV main transformer in Wuhan metro, and remanence is the most fundamental cause for magnetic inrush current. In view of the magnetic inrush current caused by remanence of the transformer, this paper puts forward some corresponding precautions and identifi cation methods to prevent transformer differential protection from fault tripping out.