The Research Of Lonworks In The Integrated Substation Automation System

ABSTMCTThe communication network Which connects many intelligentdevices plays an imPobo role in the Substation Automation System.CSC-2000 has intfOduced Lonworks into the Substation AutomationSystem successfully and has gained satisfied effect in actual applications oBut there are still some imPerfect ways, such as no expert and convenienttool fOr network diagnosis, the slow trallsmission speed in the faultrecording node and so on.The paPer introduces the characteristic of PCC-l0 card and studieshow to configure the card. On the basis of them, a portable tool based onPCC-l0 for network diagnosis is developed. It can imPlement manyfunctions, such as netWork messages monitoring, network messagesfiltering, some remote operations, netWork messages printing and saving.The tool for netWork diagnosis has the characteristic of portability andagility. It can reduce the workload of debugging on the network greatlyand make the diagnosis on the network convenient.The paPer analyzes the cause of the slow transmission speed in thefau1t recording node, compares the transmission speed of messagesbetween parallel-port and serial-port and presents the hardware andsoftware schemes for the node based on MIP. In the case of sameworking frequency for the Neuron chip, the transmission speed ofmessages for the node based on MIP is three or four times than that forthe node based on parallel-port. MIP solves the problem that thetransmission speed is very slow in the fault recording node. Besides, thenode based on MIP has the function of intemiPt-driven I/O o The node canreceive the messages from master and process them timely and it solvesthe problem that the resPonse to the command from the master for MMIis very slow. As a result, MiP can not only be aPplied to the fault- lI -recording node, but also applied to MMI nodeBesides, the paper discusses the schemes of connecting Lonworks with Ethernet0 And the paper analyzes and compares these schemes0...