This device enables operational experiments on commonly used relay protection, electrical secondary control circuits, and automatic devices in power plants, substations, and factories, providing students with professional skills training in a realistic and intuitive. This device enables operational experiments on commonly used relay protection, electrical secondary control circuits, and automatic devices in power plants, substations, and factories, providing students with professional skills training in a realistic and intuitive. 1College of Electric Power, South China University of Technology, Guangzhou, China 2Training and Knowledge Transformation Department, CYG SUNRI CO. As an essential practical course in electrical engineering education, relay protection experiments play a pivotal role. gh the protection algorithm. Various outcomes have been achieved for the proposed approach during the faulty conditions. The out-comes obtained during the fault period reveals that the waveform of three-phase current changes greatly, and the amplitude of three-phase current at power supply side. The DB-DL07 Power Automation and Relay Protection Experimental Device is a novel experimental device designed and developed by integrating teaching content from multiple professional courses in higher education institutions, including "Relay Protection," "Electrical Equipment," "Automatic Devices,". The Power Automation and Relay Protection Experimental Training Equipment is a foundational training system designed to meet modern curriculum requirements and real-world applications. It enables hands-on practice with relay protection systems, electrical secondary control circuits, and other key. Engineering laboratories are key elements in engineering learning and are essential for a concrete understanding of engineering topics and experiments. These key laboratories are no longer just hardware-dependent, they are a creative combination of programmable hardware and also user-defined.