Substation1
Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

high-voltage DC (HVDC)
transmission transmission of electric power (at typically 500-1500 kV) using DC rather than AC. This can be desirable for several reasons:

1. For economic reasons when a large amount of power is to be transmitted over a long distance, i.e., 300-400 miles, or via
underwater cables;

2. For the connection of asynchronous AC systems; and

3. Improved transient stability and dynamic damping of the electrical system oscillations.