With the popularization and application in recent years, unmanned substations, remote operation to achieve the status of the substation equipment monitoring become the urgent needs of grid operation. Traditional SCADA systems are not implemented on the secondary device status data acquisition, and the acquisition of secondary equipment Prudential information system operational reliability can not meet the demand for grid dispatch monitored device. With intelligent substation relay protection equipment and other secondary equipment information self-describing empowerment and communication capabilities, scheduling construction end protection equipment on-line monitoring system relay protection equipment for remote monitoring panoramic possible. This article describes the northern Hebei Power engineering practice in research and application of protection equipment on-line monitoring system, through a comprehensive analysis of monitoring and dispatching demand relay protection professionals and other device information, detailed combed relay output information, according to the degree of importance and degree of real-time demand information, the definition of information transmission path and the corresponding transport protocol to meet the needs of various users dispatching secondary device information. Through the above improvements in real-time dispatching stable protection equipment and monitoring applications. Implementation of the system to enhance the reliability of the information output relay device, effectively reducing the secondary equipment management and operation and maintenance personnel to work for the construction of intelligent scheduling provides a strong support.