Function-Oriented Information Assets Identification on Substation Automation Systems

Information security risk assessment combined with power control process is an issue which has not properly solved yet. As substation automation system (SAS) functions as the key link of between implementation of control instructions and the collection of operation information, research on the application of information assets identification method in SAS under network environment, is an important part of improving information security risk assessment system in power system. Consisting of the features of SAS, the paper presents a function- oriented information assets identification method with following procedures: Establishing function tree model to identify assets and defining key level as a parameter to measure the importance of assets, utilizing association factor to measure the association between assets and quantitatively analyzing the degree of association by building association matrix. The paper also presents assets quantification method on system level, according to the impact of different functions on the electric power primary system. At last, the paper constructs an evaluating example with IEC 61850 standard, and verifies the effectiveness of assets identification method.