1. Occupies a small area. It is usually buried in the soil or laid indoors. In trenches and tunnels, the insulation distance between the lines is small, no towers are used, it occupies less land, and basically does not occupy space on the ground.
2. High reliability. Affected by climatic conditions and surrounding environment, transmission performance is stable and reliability is high.
3. It has more favorable conditions for the development of ultra-high voltage and large capacity, such as low temperature and super-conducting cables.
4. Large distributed capacitance.
5. Low maintenance workload.
6. The possibility of electric shock is small.