One device can condense the complete link of "± 800 kV UHVDC -1000 kV AC -500 kV substation" into the laboratory, allowing students to "see, touch, and adjust" all key physical quantities in a completely safe environment. Teaching mode: The teacher sends out scenarios with just one click, and the students observe the phenomena. Competition mode: Students are grouped to design the operation mode and fault handling plan, and the system automatically scores. Typical application scenarios: Electrical Engineering courses in universities: Experimental courses on "High Voltage Technology" and "Power System Analysis"; Power Grid Company Training Center: New employee onboarding and anti accident drills for regulators.