This article explores the current trends, innovations, and market insights surrounding relay protection, focusing on tools like the secondary injection test set, three-phase relay test set, and single-phase relay test set. 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. Development of Smart Grids and Relay Protection 2. Early traditional grids primarily operated on a one-way transmission and centralized generation model, with limited monitoring and control. Relay protection systems are essential in maintaining the safety and reliability of modern electrical grids. By analyzing the application of DI technologies, such as big data, artificial intelligence, and the Internet of Things, in power systems, he study examines their impact on relay protection. To achieve information sharing and interoperability among intelligent electrical equipment in intelligent substations, the author proposes research on relay protection and security technology for the expansion project of intelligent substations.
