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Fault current limiting system and method

  • US 7,075,767 B2
  • Filed: 06/29/2004
  • Issued: 07/11/2006
  • Est. Priority Date: 12/31/2001
  • Status: Expired due to Term
First Claim
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1. A fault current limiting system, the system comprising:

  • switching means, which are connected to a circuit breaker for managing a current breaking operation on a power distribution line in absence of fault, said switching means providing a fast switching operation;

    a current path comprising at least a limiting fuse, said path being arranged in parallel to said switching means;

    a switching system to replace a blown set of fuses with an unblown set of fuses after a fault limiting operation has occurred;

    a control unit, which receives signals indicative of starting fault conditions, said control unit estimating the amplitude of the fault current based on said signals, said control unit sending a switch command to the switching means and to the circuit breaker when the fault current is estimated to rise above a predefined threshold,said control unit sending a switch command only to the circuit breaker when the fault current is estimated to remain under said predefined threshold.

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