| The Condition-based Maintenance (CBM) mode is the ideal power equipment maintenance mode. Then the condition monitoring (CM) and fault diagnosis of the power equipment are the basis of the CBM mode. So the on-line CM and fault diagnosis of the power equipment in the substation are more and more important.No unified standards are established on the power equipment On-Line Monitoring System (OLMS) at present. The separate no-line monitoring devices from different manufactures are private system respectively, which did not support interoperability, so the technology barrier is existed in establishing on-line monitoring network. IEC61850, the last international standard for SAS, defines the communication between IEDs (Intelligent Electronic Devices) and substation system structure, which represents the future direction of digital substation. The purpose of IEC61850 is to enhance the interoperability among IEDs for building a seamless communication system. At present, the applied research is carried out around the IEC61850 standard all over the world. It would play an important role in practice for the application of object-oriented modeling theory defined in IEC61850 to put the whole substation equipment as an object of study and set up a distributed OLMS of the substation equipment network.Virtual Instrument (VI) technology, as a result of combination of computer technology and measurement technology, represents an important trend of instrument development. ARM-based microprocessor is high performance 32-bit microcontroller, which can be embedded RTOS (Real-Time Operating System) and be able to multi-task operation. The research and application of distributed OLMS of the substation power equipment based on VI and ARM microprocessor is carried out, and the object-oriented modeling techniques and theory of IEC61850 are used in the design of the OLMS of the substation power equipment. The main research results are as following:(1) Applies IEC61850 standard to the OLMS of substation equipment. A new method of unified modeling of distributed on-line monitoring of substation equipment is put forward, and the modeling theory of IEC61850 is used in the information merging unit of the on-line monitoring system of the substation equipment.(2) Based on the ARM microprocessor LPC2214 and the ROTSμC/OS-II, the design of the field testing unit is completed, and the data communication network is set up. According to the application layer protocol of sampled value message in IEC61850, the Ethernet mapping of the field sampled value communication is realized, of which performance meet design requirement through experimental verification.(3) The connotative meaning of the digital substation standard - IEC61850 is analyzed. The principal features of IEC61850 are discussed, including functional hierarchy, IED logical functions combination and decomposition, object-oriented modeling, and Substation Configuration description Language (SCL) and so on.(4) Based on VI technology, the master control software of the OLMS is developed with LabVIEW graphic programming language, including the development of the database system, information inquiry sub-program software system and so on. The Human Machine Interface (HMI) design is based on a special style which is similar to wiring scheme of primary device in power system., so it can bring more convenience to operators.The purpose of OLMS of the power equipment is to improve the accuracy of fauit diagnosis of the power equipment, and provide bases for state maintenance. The research on OLMS of the power equipment will be processed in long time. In future, the standard should be established and the interconnection and intercommunication between OLMS of the substation power equipment and digital substation automation system are should be researched farther. Then the function of digital substation would be increased.
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