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21G

Protection functions

Ground distance protection

Evaluates a distance characteristic for a phase-to-earth fault loop.

Ground distance includes the ground-loop measurement treatment; it is not simply phase distance with a different alarm label.

Protection functions

Uses measured voltage and current to assess an electrical distance or impedance characteristic.

Distance protection uses impedance-related criteria; directional overcurrent 67 uses current and directional supervision.

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.