分析了一起 110 kV变压器差动保护动作事故,保护动作原因为变压器接线方式设置与实际不匹配,导致变压器差动保护装置在区外故障时误动.基于该误动原因分析提出变压器平衡关系自动校验方案,供专业技术人员借鉴与参考.仿真实验验证了该方案的有效性.
The present work analyzes a mal-operation accident of the differential protection occurred on a certain 110 kV transformer.The mal-operation was caused by the mismatch between transformer wiring mode and actual situation,re-sulting in undeserved activation of the protection device when the distribution line encountered an external fault. Based on the obtained reason for this mal-operation,an adaptive verification scheme for transformer balance relationship is pro-posed,hoping to provide useful reference for relevant personne.l The effectiveness of the proposed scheme is verified through simulative experiments.