Research on the Architecture and Key Technologies of Remote Online Protection Testing System in Smart Substation

In recent years, the technology in smart substation has been rapidly developed in China, and core technical advantages such as digitalization and standardization of information sharing in smart substation have been further demonstrated. However, the advantages of smart stations such as logical isolation and process layer data sharing are not fully utilized in the maintenance of protection device in smart substation. At present, isolator link mechanism is still widely used in the maintenance of protection device in smart substation, and plugging and unplugging of equipment fibers are often required during the testing process, which brings potential risks to the safe operation of the protection equipment. In order to solve these problems, this paper proposes a technical solution of remote online relay protection testing system architecture by deeply exploring the digital advantages of smart substations. Firstly, the virtual circuit logical isolation technology for relay protection devices based on IEC61850 ED2 is discussed in detail. Secondly, it focuses on the design and functional application of the smart substation remote online testing APP; Based on the current technical situation, the feasibility of realizing network remote secure access from the dispatching center to the smart substation side and the entire test data flow are emphatically analyzed. Combined with the pilot project, the remote online relay protection testing system is preliminarily verified. The results show that remote online testing of relay protection can effectively improve the efficiency of operation and maintenance of relay protection in smart substations.