The technical development of relay protection is inseparable from the development of electronics, information, communication and other technologies. In the future, with the gradual application of electronic CT (current transformer) and PT (voltage transformer), and the further improvement of the IEC61850 standardization protocol, it is foreseeable that digital technology will be more widely used. Electronic CTs and electronic PTs with voltage levels of 110 kV and 220 kV have been put into trial operation in China, and the research and development of relay protection equipment suitable for electronic CTs and PTs will promote the development of relay protection technology and drive relay protection. The transformation of new protection principles, new technologies and new applications has become a new topic for relay protection researchers.

Microcomputer protection relies on software to achieve protection functions. Compared with traditional transistor and integrated circuit protection, it has significant advantages such as strong self-inspection function, high integration of protection functions, stable operating characteristics, high reliability, and small maintenance. The development direction of relay protection technology.