In order to solve the problem of direct monitoring and fault location of the process level network in the smart substation

the mapping relationship between the virtual link and the physical link in the process level network is analyzed. A dynamic monitoring method of the process level network is proposed based on the process level switch. This method adopts the process level switch as the data acquisition and monitoring unit for running states of the process level network

and the network analyzer is employed as an assistant analysis tool. By dynamically learning the topology of process level network

the link mapping relationship and the list of traffic statistics based on the virtual link are established. Finally

the fault location and state monitoring of process level network are realized. The feasibility of the method has been verified by experiments.