1 Buried in underground pipelines or channels, no large corridors are required, and the land occupation is small.
2 Unaffected by climate and environment, the transmission performance is stable.
3 The maintenance workload is small and the safety is high.
4 It can be used for sections where the overhead line is difficult to pass, such as trans-strait transmission.
5 The conveying capacity is limited.
6 The cost is high, and the higher the voltage, the greater the difference between the overhead line and the overhead line.
7 When a fault occurs, the troubleshooting time is long.