Based on the analysis of fault control strategies for grid-forming converters, this study investigates the impact of the converter's fault response characteristics on overcurrent protection, pilot protection, distance protection, and differential protection and. Based on the analysis of fault control strategies for grid-forming converters, this study investigates the impact of the converter's fault response characteristics on overcurrent protection, pilot protection, distance protection, and differential protection and. 1 State Grid Tong Hua Power Supply Company, State Grid Jilin Electric Power Company Limited, Tonghua, Jilin, China The increasing penetration of new energy into the power system is accompanied by a series of challenges that traditional relay protection systems face: fast fault detection and. able sources such as wind and solar. These clean energy sources, connected through inverters and flexible transmission systems, are transforming traditional grids based on synchronous generators into more flexibl cant challenges to system stability. Nowhere is that clearer than in the challenge to. Firstly, considering the fuzziness and uncertainty of the boundary division of relay protection evaluation levels, a relay protection risk assessment method based on normal cloud model has been proposed. Then, due to the particularity of historical statistical data, a weight calculation method. SIPROTEC 5, built on extensive field experience, offers comprehensive functionalities and device types for modern electrical energy systems. Its modular design and powerful DIGSI 5 engineering tool provide tailored solutions. This tool gives a quick guidance to find a SIPROTEC 5 protection relay. Power System Security and Operation Key Laboratory of Sichuan Province, State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China State Key Laboratory of Advanced Electromagnetic Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and. Fingrid's application guideline for relay protection presents the operating principles of the relay protection in Fingrid's 110, 220 and 400 kV power networks and the requirements for operation of the protection systems of Fingrid customers (hereinafter referred to as 'customer').