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Method and apparatus for limiting current in a direct voltage network of a power transmission system

  • US 5,999,388 A
  • Filed: 09/16/1997
  • Issued: 12/07/1999
  • Est. Priority Date: 03/24/1997
  • Status: Expired due to Term
First Claim
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1. A current limiting apparatus for a direct voltage network of an HVDC system which is connected through a VSC-converter to an alternating voltage network, comprising:

  • at least a first semiconductor switching element which can be electronically turned on or off connected in series with said direct voltage network; and

    a surge diverter connected in parallel with said switching element, said surge diverter being connected in series with said direct voltage network and absorbing excess current in normal operation, and dissipating power flowing through said direct voltage network when said switching element is switched to a permanently off state in response to a high current condition thereby reducing current through said direct voltage network.

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