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