山东电力高等专科学校学报

针对一起主变压器差动保护动作跳闸事件，根据保护动作情况、故障录波信息、现场设备检查情况及主变压器相关诊断性试验结果，确定了故障相别和故障范围。主变压器送电后，通过局部放电检测初步定位了异常放电隐患的位置。将主变压器停电，检查人员进入开关柜内部进行细致检查，明确了故障点的具体位置。最后对异常放电的原因进行了分析，并提出了相应的整改措施。

In allusion to a main transformer tripping incident caused by differential protection action,the fault phase and fault range are determined based on the protection action,the fault recording information,the on-site equipment inspection and the main transformer related diagnostic test results. The position of the abnormal discharge hidden danger is preliminarily localized by partial discharge detection after the main transformer is powered up. The inspector goes into the switch cabinet for close inspection after the main transformer is shut down,and the specific location of the fault point is determined. Finally the causes of the abnormal discharge are analyzed,and the corrective measures are proposed.