ABB RER620 - Page 116

Section 4 1MAC309294-MB F
Protection functions
110 RER620
Technical Manual
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
AB
and operating quantity I
B
- I
C
marked as φ.