ABB RER620 Technical Manual page 116

Section 4
Protection functions
110
Figure 47: Single-phase ground fault, phase A
In an example of the phasors in a two-phase short-circuit failure where the fault is between
the phases B and C, the angle difference is measured between the polarizing quantity V
and operating quantity I
B
- I marked as φ.
C
1MAC309294-MB F
AB
RER620
Technical Manual