励磁涌流对变压器差动保护的影响分析及对策探讨

Analysis of the Influence of Magnetizing Inrush Current on Transformer Differential Protection and Its Solutions

大型变压器在空载合闸或切除故障后恢复供电时,因为励磁涌流的存在,会导致变压器差动保护装置发生误动或拒动,从而影响电力系统的正常运行。分析变压器差动保护的工作原理,研究变压器励磁涌流产生的原因和特点,对比分析当前所采用的4种抑制励磁涌流的措施,为解决变压器保护装置的误动或拒动提供帮助。

Absrtact：When a transformer is switched on without load or the power supply is restored after a fault , the in-rush current will lead to the differential protection device making a faulty action or refusing action sothat affecting the normal operation of equipment .The paper analyzes differential protection principle of the transformer , and develops the causes for the inrush current generated and its characteristics , analyzes contrastively four measures to restrain the excitation inrush current , in order to help resolving malfunction of protection equipment for transformer .