In a malfunction fault in BaoSteel Xinbao’s transformer substation 110 kV grid, three generating units in Baosteel Power Plant were affected more or less. Based on e-quipment actions and alarms and in light of the recorded fault waves, the electrical variables in the three units were calculated and explained. The cause of relay protection and actions of the automatic device were analyzed in depth, conclusion was drawn and recommendations were provided.%在一起宝钢新宝变110 kV电网故障中，宝钢电厂3台发电机组受到不同程度的影响。依据发电机组设备动作和报警情况，结合故障波形，计算说明宝钢电厂0#、3#、4#发电机组电气量的变化，深入分析了继电保护和自动装置动作的原因，得出了结论，为设备管理提出了建议。
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