1. less land. Generally buried in the soil or applied in the indoor, ditch, tunnel, the insulation distance between lines is small, no pole tower, less space, basically do not occupy the ground space.
2. reliability is high. The influence of climate and surrounding environment is small, the transmission performance is stable and the reliability is high.
3. have more favorable conditions for ultra high pressure, large capacity development, such as low temperature, superconducting power cable and so on.
4. distribution capacitance is large.
5. less maintenance work.
6. the possibility of electric shock is small.