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Current modulation of direct current transmission lines

  • US 6,714,427 B1
  • Filed: 11/07/2002
  • Issued: 03/30/2004
  • Est. Priority Date: 11/07/2002
  • Status: Active Grant
First Claim
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1. A current-modulation method of transmitting high voltage direct current (HVDC) power over a transmission system comprising three conductors, wherein each conductor has a nominal thermal limit to its current-carrying capacity, the method comprising:

  • transmitting DC current over one conductor at a level which may be above the conductor'"'"'s nominal thermally-limited current-carrying capacity;

    returning the transmitted current over the other two conductors, such that each return current is less than the transmitted current, wherein the total transmitted and return currents are nominally equal; and

    periodically switching the current level in the conductors so as to rotate the higher level current among the three conductors, such that, over time, losses are reduced and the resistance heating of the conductors does not exceed the conductors'"'"' thermal limits.

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