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The overcurrent elements use three-phase line currents and neutral current together with the
differential protection and the restricted earth fault protection. For the setting, following
relations between the overcurrent elements and the applying windings must be noticed.
1OC, 1OCI :
2OC, 2OCI :
3OC, 3OCI :
1EF, 1EFI :
2EF, 2EFI :
3EF, 3EFI :
Primary (high-voltage) winding
Secondary (medium-voltage) winding
Tertiary (low-voltage) winding
1REF applied neutral circuit
2REF applied neutral circuit
3REF applied neutral circuit
30
6 F 2 S 0 7 8 9
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