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Method and a device for communication in a high voltage converter station

  • US 5,969,956 A
  • Filed: 03/23/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 06/11/1997
  • Status: Expired due to Term
First Claim
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1. A method for communicating between low potential level and a valve located on high voltage potential level in a high voltage converter station, said valve comprising a plurality of valve units each having at least one semiconductor component of turn-on type and for each semiconductor component a first control unit located on high voltage potential and controlling said semiconductor component, said first control units being connected to a valve control unit located on low potential level through light conductors, whereby signals associated with a change in the conducting state of the respective semiconductor components are sent between said valve control unit and said respective first control unit, while separating them galvanically, said method comprising the step of:

  • sending serial messages between said valve and the low potential level via said light conductor in periods of time during which the light conductor is free from said signals associated with a change in the conducting state of said semiconductor components.

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