(: Connect the pilot project of the substation automation system based on the IEC61850 standard, put forward the scheme principle of the network communication black box of the IEC61850 automation system, realize the recall of the whole process of the network communication shortcomings of the automation system, provide the office maintenance personnel with the visualization tool of the network communication process, and assist the maintenance personnel Accurately locate the fault elements, and play an important role in the joint debugging and office maintenance of the substation automation system.)