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This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
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
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.
Released for:Schneider Electric Egypt and North East Africa
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