Abstract: In recent years, the in-depth research, promotion and application of smart substation have accelerated the standardization process of various technologies in China and abroad. Firstly, based on the research background of ubiquitous electric power internet of things（IoT） standard architecture, this paper summarizes the present standardization situation of the smart substation automation and relay protection technologies in China and abroad. Secondly, it elaborates the standards constitution of substation automation and relay protection technology in IEC framework, and analyzes the system architecture and key technical progress of the three core standards. IEC 61850 includes configuration language, information model, service mapping and network communication. IEC 60255 includes relay protection switch input/output digitization, data transmission delay, and synchrophasor measurement. IEC 61869 includes general technical requirements, medium-voltage low-power transformers, digital interfaces and merging unit（MU）. Finally, the paper presents related suggestions on five aspects, including system architecture, information model inheritance, functional standard formulation, full-dimension information security, and integration research of domestic and international standards.