励磁涌流对变压器差动保护的影响分析及对策探讨

摘要

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 .%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。