通过分析一起发电机纵差保护误动的原因，对差动保护两侧电流互感器的特性、差动回路阻抗进行比较，并全面复核保护定值，以避免在区外故障时，差动回路中产生不平衡电流，发生保护误动作。%Based on the cause analysis of the malfunction of the longitudinal differential protection of a generator,this essay compares the featm's and the differential circuit impedances between the two current transformers of the dif ferential protection. Besides, it also rechecks the fixed value of the protection to avoid protection malfunctions caused by unbalanced current in the differential circuit beyond the relay protection zone.
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