Abstract
The safety of the power grid is threatened by incorrect action (IA) of relay protection system (RPS) resulting from defects, and even worsen a blackout. Currently, a large amount of data about IAs and defects in RPS are accumulated in operation. However, the relationship between the IAs and device defects is unclear. Recognizing the above problems, based on the 10-year field data, this paper proposes fault tree analysis for the IAs of RPS to discover relationship between the IAs and device defects. In detail, based on analysis of the field data, the defect sets which is related to IAs are built, after that, the method to construction of two fault trees for the incorrect actions, which taking the incorrect actions as the top event, and the defect locations and component factors as the bottom level respectively, is proposed. Furthermore, combined with the 10-year filed data, the different fault trees are established and presented, and the related analysis for different responsible entities is discussed, which show the feasibility and effectiveness of proposed method.
Highlights
Relay protection is the first line of defense to ensure the safety of the power grid, and its rapid and correct action can effectively prevent the deterioration of the power system and ensure the stable operation [1]
Step1: Starting from the failure devices that cause the incorrect action of relay protection system; Step2: Summarize the categories of failure devices according to the defect sets; Step3: According to different device categories and structures, analyze the defective parts corresponding to failure devices; Step4: Combined with the causes of defects in each part, summarize the specific factors that may cause failure of each part; Step5: Based on the analysis of the defective location, the failure cause is introduced as the bottom event of the fault trees, the failure cause is corresponded to different failure devices, and the responsible entities for the incorrect action of the relay protection are divided based on the failure cause
The above data analysis and fault tree show that the relay protection device and the secondary circuit are the key factor related to the incorrect action of relay protection system
Summary
Relay protection is the first line of defense to ensure the safety of the power grid, and its rapid and correct action can effectively prevent the deterioration of the power system and ensure the stable operation [1]. Recognizing the above problems, based on the 10-year incorrect actions data of the State Grid and the fault tree method, this paper proposes a method to construct the fault tree model for the RPS to discover relationship between the IAs and device defects. (1) The fault tree model analysis method is proposed to analyze the relationship between the device defects and IAs. The proposed method can summarize the probability of device defects occurring under different influencing factors, analyze the responsible department for incorrect actions, and provide relevant suggestions in operation and maintenance management. (3) The fault tree of IAs with component factors of the relay protection system is established It could refine the causes of various defective devices, and be applied to analyze the impact of production, operation and maintenance work of the different entities on incorrect actions.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
