Abstract: Building sustainable and efficient power systems based on the power electronics technology is the fundamental to accomplish the target of China’s power and energy reconstructions. Under such situation, power electronics apparatus has been displacing more traditional electromagnetic apparatus throughout the generations, transmissions, distributions and consumptions in modern power systems, which in a high level has been threatening the secure operation of systems. With the help of generalized relationship between the node/apparatus characteristics and the system transient responses, this paper summarized the typical control and protection schemes widely applied in power electronics apparatus, gave the basic cognition of both transient characteristics in power electronics apparatus and transient responses in power electronized power systems. Fundamental challenges and preliminary perspectives were concluded to analyze the multi-time scale and nonlinear transients in power electronized power systems.