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What is the definition of ANSI 68 - Logic discrimination?
This function provides:
  • perfect tripping discrimination with phase-to-phase and phase-to-earth short-circuits, on all types of network
  • faster tripping of the breakers closest to the source (solving the drawback of conventional time discrimination).

Each Sepam is capable of:
  • sending a blocking input when a fault is detected by the phase overcurrent and earth fault protection functions, which may or may not be directional (ANSI 50/51,
50N/51N, 67 or 67N/67NC)
  • and receiving blocking inputs which inhibit protection tripping. A saving mechanism ensures continued operation of the protection in the event of a blocking link failure.

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