In which situation is DC transmission preferred over AC transmission in power networks?
For very long-distance underwater cables
HVDC (High Voltage Direct Current) transmission is preferred for very long-distance and underwater (submarine) cables.
In AC cables the large capacitance between conductor and sheath draws heavy charging current, which severely limits the useful transmission distance of underwater cables.
DC has no charging current, no skin effect and no reactance, so power can be sent over very long submarine links with lower losses; it also allows interconnection of two AC systems.
Hence, DC transmission is preferred for very long-distance underwater cables.
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