ABB RED615 Technical Manual page 218

Section 4
Protection functions
212
GUID-C648173C-D8BB-4F37-8634-5D4DC7D366FF V1 EN
Figure 105: Single-phase earth fault, phase A
In an example case of a two-phase short circuit failure where the fault is between
phases B and C, the angle difference is measured between the polarizing quantity
U and operating quantity I
BC
GUID-65CFEC0E-0367-44FB-A116-057DD29FEB79 V1 EN
Figure 106: Two-phase short circuit, short circuit is between phases B and C
- I in the self-polarizing method.
B C
1YHT530004D05 D
615 series
Technical Manual