DC transmission has some advantages over AC transmission, but it cannot completely replace ac transmission system due to some limitations
High Cost:
Maintenance of insulators in HVDC transmission line is more Circuit breaking in multi-terminal dc systems is difficult and costlier
Therefore because of the cost factors HVDC transmission is economical if bulk amount of power (1500-6000MW) transmitting over large distance (beyond 500kms) compared to HVAC transmission
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