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High-voltage direct current
A high-voltage direct current (HVDC) system uses direct current (DC) and high voltages (currently between 100 kV and 800 kV) for electric power transmission. It contrasts with the more common alternating current (AC) transmission systems. HVDC lines are commonly used for long-distance power transmission, since they require fewer conductors and incur less power loss than equivalent AC lines. HVDC also allows power transmission between AC transmission systems that are not synchronized.
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