ABB RED615 Technical Manual page 382

Section 4
Protection functions
376
GUID-01A2A41E-2813-448D-953F-F9690578DEDE V1 EN
Figure 199: Protection communication supervision detects failures on
communication
In-zone transformer
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Figure 200: In-zone transformer example about CT ratio correction calculation
The CT ratio correction calculation starts with the rated load current calculation for
HV and LV sides. The rated load current is defined as the rated power of the
transformer divided by the square root of three times the nominal phase-to-phase
voltage at the HV or LV side.
1YHT530004D05 D
615 series
Technical Manual