For solving the problem that the defects in the transmission link of supervisory and control information are difficult to be found and the solution of defects is highly dependent on the experiences and technical level of commissioning workers

a method for full-link monitoring and fault diagnosis of supervisory and control information in smart substation is introduced. By establishing the full-link configuration information flow of supervisory and control information

the consistency check among system configuration description

remote configuration description and monitoring information table is realized. By establishing the real-time supervisory and control information flow during the transmission of supervisory and control information between communication layers of substation

the full-link monitoring of supervisory and control information is realized. And intelligent diagnosis of abnormal transmission of supervisory and control information is realized based on the matching of full-link configuration information flow and real-time supervisory and control information flow. Through case analysis

it is verified that the proposed method can effectively locate the fault points such as the misalignment of configuration and secondary circuit wiring

and improves the efficiency of defect investigation in transmission link of supervisory and control information

which has certain practical value.