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What is the definition of ANSI 64REF - Restricted earth fault differential?
Detection of phase-to-earth faults on 3-phase windings with earthed neutral, by
comparison of residual current calculated from the 3 phase currents and residual
current measured at the neutral point.

Characteristics
  • instantaneous tripping
  • percentage-based characteristic with fixed slope and adjustable low set point
  • more sensitive than transformer or machine differential protection.

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