The new power system features a highly coupled cyber-physical system

with strong interactions between the primary and secondary systems and complex control mechanisms

which poses new challenges to system security. This paper analyzes and proposes the cyber-physical security characteristics

including physical security

functional security

and cyber security. It also addresses the challenges in risk cognition

monitoring

and protection of the cyber-physical security system

proposing key technologies such as the modeling and analysis of cyber-physical security threats across multi-domains

cyber-physical coordination-based security threat situational awareness and detection

and multi-spatial-temporal linkage response security protection methods. Based on the typical scenarios of power monitoring systems

this paper explores the prospects of cyber-physical security protection application in the new power system. The proposed cyber-physical security protection system can realize the quantitative characterization of cross-domain security risks and the multi-spatial-temporal collaborative perception

identification and resolution of security events

providing support for the safe operation of the new power system.