A Goal Oriented Reliability Assessment of System Protection Devices

Ultra high voltage alternating current/ direct current (UHV AC/DC) grid system protection is an essential tool to deal with the problem of “strong DC and weak AC” during the transition period of grid development. As the final measure of system protection devices, the reliable operation is crucial to the operational safety of the whole grid. This paper introduces the Goal Operation (GO) method to evaluate the reliability of system protection devices. Firstly, the working principle of the system protection device is analyzed; Secondly, a GO model for reliability assessment is constructed based on the working principle of the system protection; Finally, taking the out-of-step tripping protection device as an example, the effectiveness of the proposed method is verified.